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2014/10/15 ¤U¤È 10:10:29
iphone Programming Glossary: instanceHow to check for an active Internet Connection on iPhone SDK? http://stackoverflow.com/questions/1083701/how-to-check-for-an-active-internet-connection-on-iphone-sdk 3 Add @class Reachability to the .h file of where you are implementing the code 4 Create a couple instances to check in the interface section of the .h file Reachability internetReachable Reachability hostReachable.. BOOL animated NSNotificationCenter defaultCenter removeObserver self Note There might be an instance using viewWillDisappear where you receive a memory warning and the observer never gets unregistered..
How can I upload a photo to a server with the iPhone? http://stackoverflow.com/questions/125306/how-can-i-upload-a-photo-to-a-server-with-the-iphone Initializer. Kicks off the upload. Note that upload will happen on a separate thread. Results An instance of Uploader. Side effects None id initWithURL NSURL aServerURL IN filePath NSString aFilePath IN..
How to get the RGB values for a pixel on an image on the iphone http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone I defined constants #define RGBA 4 #define RGBA_8_BIT 8 In my UIImage subclass I declared instance variables size_t bytesPerRow size_t byteCount size_t pixelCount CGContextRef context CGColorSpaceRef..
Send and receive messages through NSNotificationCenter in Objective-C? [closed] http://stackoverflow.com/questions/2191594/send-and-receive-messages-through-nsnotificationcenter-in-objective-c removeObserver self super dealloc id init self super init if self return nil Add this instance of TestClass as an observer of the TestNotification. We tell the notification center to inform us of.. received the test notification @end ... somewhere else in another class ... void someMethod All instances of TestClass will be notified NSNotificationCenter defaultCenter postNotificationName @ TestNotification..
http://stackoverflow.com/questions/2371489/why-do-you-use-an-underscore-for-an-instance-variable-but-not-its-corresponding do you use an underscore for an instance variable but not its corresponding property duplicate Possible Duplicate How does an underscore in..
display image from URL retrieved from ALAsset in iPhone http://stackoverflow.com/questions/3837115/display-image-from-url-retrieved-from-alasset-in-iphone wont have run yet as its a callback. So largeImage wont be valid yet. largeImage needs to be an instance variable not scoped to the method. I use this construct to do this when using the method but you may..
Change User Agent in UIWebView (iPhone SDK) http://stackoverflow.com/questions/478387/change-user-agent-in-uiwebview-iphone-sdk SDK I have a business need to be able to customize the UserAgent for an embedded UIWebView. For instance I'd like the server to respond differently if say a user is using one version of the app versus another...
How do I size a UITextView to its content? http://stackoverflow.com/questions/50467/how-do-i-size-a-uitextview-to-its-content content Is there a good way to adjust the size of a UITextView to conform to its content Say for instance I have a UITextView that contains one line of text Hello world I then add another line of text Goodbye..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers communicating between the viewcontroller into your app delegate and reference the viewcontroller instances in the app delegate methods. Fair 'nuff. A bit further on we get this slide telling us what we should.. easily do my communication methods in the app delegate by reference's the multiple viewcontroller instances in my appdelegate but I want to do this sort of thing the right way. Please help me do the right thing.. BookPickerViewController void initWithWarehouse BookWarehouse warehouse myBookWarehouse is an instance variable myBookWarehouse warehouse myBookWarehouse retain void doSomething I need to do something with..
Create singleton using GCD's dispatch_once in Objective C http://stackoverflow.com/questions/5720029/create-singleton-using-gcds-dispatch-once-in-objective-c share improve this question This is a perfectly acceptable and thread safe way to create an instance of your class. It may not technically be a singleton in that there can only ever be 1 of these objects..
Tab bar controller inside a navigation controller, or sharing a navigation root view http://stackoverflow.com/questions/576764/tab-bar-controller-inside-a-navigation-controller-or-sharing-a-navigation-root emphasis added viewController The view controller that is pushed onto the stack. It cannot be an instance of tab bar controller. I would like to avoid private APIs and the like but I'm not sure why this usage..
What's the easiest way to resize/optimize an image size with the iPhone SDK? http://stackoverflow.com/questions/612131/whats-the-easiest-way-to-resize-optimize-an-image-size-with-the-iphone-sdk local iPhone disk. Some of those images are pretty big in size widths larger than 500 pixels for instance . Since the iPhone doesn't even have a big enough display to show the image in its original size I'm.. the following NSData dataForJPEGFile UIImageJPEGRepresentation theImage 0.6 This creates an NSData instance containing the raw bytes for a JPEG image at a 60 quality setting. The contents of that NSData instance..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c MyClass void windowDidMove NSNotification notification ... @end Then you could create an instance of MyClass and assign it as the window's delegate MyClass myDelegate MyClass alloc init window setDelegate..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c if I want to hang on to an object for some length of time if it's a member variable in a class for instance then I need to make sure the object's reference count knows about me. As described above an object's..
What is the best way to deal with the NSDateFormatter locale “feature”? http://stackoverflow.com/questions/6613110/what-is-the-best-way-to-deal-with-the-nsdateformatter-locale-feature in onsies twosies but I'm dealing with about ten different apps and the first one I look at has 43 instances of this scenario. So any clever ideas for a macro overridden class whatever to minimize the effort.. always using the same date format s you could also add category methods that return singleton instances with certain configurations something like sharedRFC3339DateFormatter . Be aware however that NSDateFormatter..
When do you make an underscore in front of an instance variable? [duplicate] http://stackoverflow.com/questions/837559/when-do-you-make-an-underscore-in-front-of-an-instance-variable do you make an underscore in front of an instance variable duplicate Possible Duplicate How does an underscore in front of a variable in a cocoa objective..
iPhone: How to load a View using a nib file created with Interface Builder http://stackoverflow.com/questions/863321/iphone-how-to-load-a-view-using-a-nib-file-created-with-interface-builder to load and handle the nib create an IBOutlet property that will hold the loaded nib's view for instance in MyViewController a UIViewController subclass @property nonatomic retain IBOutlet UIView myViewFromNib..
Reading HTML content from a UIWebView http://stackoverflow.com/questions/992348/reading-html-content-from-a-uiwebview at the stringWithContentsOfURL encoding error method of NSString it lets you pass in a URL as an instance of NSURL which can easily be instantiated from NSString and returns a string with the complete contents..
How to check for an active Internet Connection on iPhone SDK? http://stackoverflow.com/questions/1083701/how-to-check-for-an-active-internet-connection-on-iphone-sdk and Reachability.m to the project you can get those here 3 Add @class Reachability to the .h file of where you are implementing the code 4 Create a couple instances to check in the interface section of the .h file Reachability internetReachable Reachability hostReachable 5 Add a method in the .h for when the network status.. method remove yourself as an observer void viewWillDisappear BOOL animated NSNotificationCenter defaultCenter removeObserver self Note There might be an instance using viewWillDisappear where you receive a memory warning and the observer never gets unregistered so you should account for that as well. Note The domain you..
How can I upload a photo to a server with the iPhone? http://stackoverflow.com/questions/125306/how-can-i-upload-a-photo-to-a-server-with-the-iphone initWithURL filePath delegate doneSelector errorSelector Initializer. Kicks off the upload. Note that upload will happen on a separate thread. Results An instance of Uploader. Side effects None id initWithURL NSURL aServerURL IN filePath NSString aFilePath IN delegate id aDelegate IN doneSelector SEL aDoneSelector IN..
How to get the RGB values for a pixel on an image on the iphone http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone a read only reference to data . Method 1 Writable Pixel Information I defined constants #define RGBA 4 #define RGBA_8_BIT 8 In my UIImage subclass I declared instance variables size_t bytesPerRow size_t byteCount size_t pixelCount CGContextRef context CGColorSpaceRef colorSpace UInt8 pixelByteData A pointer to an array of RGBA..
Send and receive messages through NSNotificationCenter in Objective-C? [closed] http://stackoverflow.com/questions/2191594/send-and-receive-messages-through-nsnotificationcenter-in-objective-c objects to the deallocated object. NSNotificationCenter defaultCenter removeObserver self super dealloc id init self super init if self return nil Add this instance of TestClass as an observer of the TestNotification. We tell the notification center to inform us of TestNotification notifications using the receiveTestNotification..
http://stackoverflow.com/questions/2371489/why-do-you-use-an-underscore-for-an-instance-variable-but-not-its-corresponding do you use an underscore for an instance variable but not its corresponding property duplicate Possible Duplicate How does an underscore in front of a variable in a cocoa objective c class work I am new..
display image from URL retrieved from ALAsset in iPhone http://stackoverflow.com/questions/3837115/display-image-from-url-retrieved-from-alasset-in-iphone of helps. Also when findLargeImage returns the resultblock wont have run yet as its a callback. So largeImage wont be valid yet. largeImage needs to be an instance variable not scoped to the method. I use this construct to do this when using the method but you may find something more suitable to your use. node.view findLargeImage..
Change User Agent in UIWebView (iPhone SDK) http://stackoverflow.com/questions/478387/change-user-agent-in-uiwebview-iphone-sdk User Agent in UIWebView iPhone SDK I have a business need to be able to customize the UserAgent for an embedded UIWebView. For instance I'd like the server to respond differently if say a user is using one version of the app versus another. Is it possible to customize the UserAgent in the existing..
How do I size a UITextView to its content? http://stackoverflow.com/questions/50467/how-do-i-size-a-uitextview-to-its-content do I size a UITextView to its content Is there a good way to adjust the size of a UITextView to conform to its content Say for instance I have a UITextView that contains one line of text Hello world I then add another line of text Goodbye world Is there a good way in Cocoa Touch to get the rect..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers Don't blindly toss all your methods that will be used for communicating between the viewcontroller into your app delegate and reference the viewcontroller instances in the app delegate methods. Fair 'nuff. A bit further on we get this slide telling us what we should do. Page 18 51 Best Practices for Data Flow Figure out exactly.. what am I to do Ok that's the set up gang. I know I can easily do my communication methods in the app delegate by reference's the multiple viewcontroller instances in my appdelegate but I want to do this sort of thing the right way. Please help me do the right thing by answering the following questions When I am trying to.. the dependencies should be injected like this @implementation BookPickerViewController void initWithWarehouse BookWarehouse warehouse myBookWarehouse is an instance variable myBookWarehouse warehouse myBookWarehouse retain void doSomething I need to do something with the BookWarehouse object which was injected for me myBookWarehouse..
Create singleton using GCD's dispatch_once in Objective C http://stackoverflow.com/questions/5720029/create-singleton-using-gcds-dispatch-once-in-objective-c return sharedInstance iphone ios objective c xcode singleton share improve this question This is a perfectly acceptable and thread safe way to create an instance of your class. It may not technically be a singleton in that there can only ever be 1 of these objects but as long as you only use the Foo sharedFoo method to access..
Tab bar controller inside a navigation controller, or sharing a navigation root view http://stackoverflow.com/questions/576764/tab-bar-controller-inside-a-navigation-controller-or-sharing-a-navigation-root to the SDK documentation for pushViewController animated emphasis added viewController The view controller that is pushed onto the stack. It cannot be an instance of tab bar controller. I would like to avoid private APIs and the like but I'm not sure why this usage is explicitly prohibited even when it seems to work fine...
What's the easiest way to resize/optimize an image size with the iPhone SDK? http://stackoverflow.com/questions/612131/whats-the-easiest-way-to-resize-optimize-an-image-size-with-the-iphone-sdk a set of image files from the network and saving them to the local iPhone disk. Some of those images are pretty big in size widths larger than 500 pixels for instance . Since the iPhone doesn't even have a big enough display to show the image in its original size I'm planning on resizing the image to something a bit smaller to.. these images as JPEGs you can take your UIImage and do the following NSData dataForJPEGFile UIImageJPEGRepresentation theImage 0.6 This creates an NSData instance containing the raw bytes for a JPEG image at a 60 quality setting. The contents of that NSData instance can then be written to disk or cached in memory. share..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c method you could create a class like this @implementation MyClass void windowDidMove NSNotification notification ... @end Then you could create an instance of MyClass and assign it as the window's delegate MyClass myDelegate MyClass alloc init window setDelegate myDelegate On the NSWindow side it probably has code..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c call retain and release . My general rule of thumb is that if I want to hang on to an object for some length of time if it's a member variable in a class for instance then I need to make sure the object's reference count knows about me. As described above an object's reference count is incremented by calling retain . By convention..
What is the best way to deal with the NSDateFormatter locale “feature”? http://stackoverflow.com/questions/6613110/what-is-the-best-way-to-deal-with-the-nsdateformatter-locale-feature @ en_US df setLocale loc loc release Not too bad in onsies twosies but I'm dealing with about ten different apps and the first one I look at has 43 instances of this scenario. So any clever ideas for a macro overridden class whatever to minimize the effort to change everything without making the code to obscure My first.. add such a method in a future version of the OS. In case you're always using the same date format s you could also add category methods that return singleton instances with certain configurations something like sharedRFC3339DateFormatter . Be aware however that NSDateFormatter is not thread safe and you have to use locks or @synchronized..
When do you make an underscore in front of an instance variable? [duplicate] http://stackoverflow.com/questions/837559/when-do-you-make-an-underscore-in-front-of-an-instance-variable do you make an underscore in front of an instance variable duplicate Possible Duplicate How does an underscore in front of a variable in a cocoa objective c class work I've seen this at Apple inside UIPickerView.h..
iPhone: How to load a View using a nib file created with Interface Builder http://stackoverflow.com/questions/863321/iphone-how-to-load-a-view-using-a-nib-file-created-with-interface-builder to later. MyView 2 in the UIViewController that you want to load and handle the nib create an IBOutlet property that will hold the loaded nib's view for instance in MyViewController a UIViewController subclass @property nonatomic retain IBOutlet UIView myViewFromNib dont forget to synthesize it and release it in your .m..
Reading HTML content from a UIWebView http://stackoverflow.com/questions/992348/reading-html-content-from-a-uiwebview The second question is actually easier to answer. Look at the stringWithContentsOfURL encoding error method of NSString it lets you pass in a URL as an instance of NSURL which can easily be instantiated from NSString and returns a string with the complete contents of the page at that URL. For example NSString googleString..
How to check for an active Internet Connection on iPhone SDK? http://stackoverflow.com/questions/1083701/how-to-check-for-an-active-internet-connection-on-iphone-sdk can get those here 3 Add @class Reachability to the .h file of where you are implementing the code 4 Create a couple instances to check in the interface section of the .h file Reachability internetReachable Reachability hostReachable 5 Add a method.. void viewWillDisappear BOOL animated NSNotificationCenter defaultCenter removeObserver self Note There might be an instance using viewWillDisappear where you receive a memory warning and the observer never gets unregistered so you should account..
How can I upload a photo to a server with the iPhone? http://stackoverflow.com/questions/125306/how-can-i-upload-a-photo-to-a-server-with-the-iphone errorSelector Initializer. Kicks off the upload. Note that upload will happen on a separate thread. Results An instance of Uploader. Side effects None id initWithURL NSURL aServerURL IN filePath NSString aFilePath IN delegate id aDelegate..
How to get the RGB values for a pixel on an image on the iphone http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone 1 Writable Pixel Information I defined constants #define RGBA 4 #define RGBA_8_BIT 8 In my UIImage subclass I declared instance variables size_t bytesPerRow size_t byteCount size_t pixelCount CGContextRef context CGColorSpaceRef colorSpace UInt8 pixelByteData..
Send and receive messages through NSNotificationCenter in Objective-C? [closed] http://stackoverflow.com/questions/2191594/send-and-receive-messages-through-nsnotificationcenter-in-objective-c defaultCenter removeObserver self super dealloc id init self super init if self return nil Add this instance of TestClass as an observer of the TestNotification. We tell the notification center to inform us of TestNotification notifications.. NSLog @ Successfully received the test notification @end ... somewhere else in another class ... void someMethod All instances of TestClass will be notified NSNotificationCenter defaultCenter postNotificationName @ TestNotification object self ..
http://stackoverflow.com/questions/2371489/why-do-you-use-an-underscore-for-an-instance-variable-but-not-its-corresponding do you use an underscore for an instance variable but not its corresponding property duplicate Possible Duplicate How does an underscore in front of a variable..
display image from URL retrieved from ALAsset in iPhone http://stackoverflow.com/questions/3837115/display-image-from-url-retrieved-from-alasset-in-iphone the resultblock wont have run yet as its a callback. So largeImage wont be valid yet. largeImage needs to be an instance variable not scoped to the method. I use this construct to do this when using the method but you may find something more..
Change User Agent in UIWebView (iPhone SDK) http://stackoverflow.com/questions/478387/change-user-agent-in-uiwebview-iphone-sdk in UIWebView iPhone SDK I have a business need to be able to customize the UserAgent for an embedded UIWebView. For instance I'd like the server to respond differently if say a user is using one version of the app versus another. Is it possible..
How do I size a UITextView to its content? http://stackoverflow.com/questions/50467/how-do-i-size-a-uitextview-to-its-content a UITextView to its content Is there a good way to adjust the size of a UITextView to conform to its content Say for instance I have a UITextView that contains one line of text Hello world I then add another line of text Goodbye world Is there a..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers that will be used for communicating between the viewcontroller into your app delegate and reference the viewcontroller instances in the app delegate methods. Fair 'nuff. A bit further on we get this slide telling us what we should do. Page 18 51 Best.. gang. I know I can easily do my communication methods in the app delegate by reference's the multiple viewcontroller instances in my appdelegate but I want to do this sort of thing the right way. Please help me do the right thing by answering the.. this @implementation BookPickerViewController void initWithWarehouse BookWarehouse warehouse myBookWarehouse is an instance variable myBookWarehouse warehouse myBookWarehouse retain void doSomething I need to do something with the BookWarehouse..
Create singleton using GCD's dispatch_once in Objective C http://stackoverflow.com/questions/5720029/create-singleton-using-gcds-dispatch-once-in-objective-c c xcode singleton share improve this question This is a perfectly acceptable and thread safe way to create an instance of your class. It may not technically be a singleton in that there can only ever be 1 of these objects but as long as you..
Tab bar controller inside a navigation controller, or sharing a navigation root view http://stackoverflow.com/questions/576764/tab-bar-controller-inside-a-navigation-controller-or-sharing-a-navigation-root animated emphasis added viewController The view controller that is pushed onto the stack. It cannot be an instance of tab bar controller. I would like to avoid private APIs and the like but I'm not sure why this usage is explicitly prohibited..
What's the easiest way to resize/optimize an image size with the iPhone SDK? http://stackoverflow.com/questions/612131/whats-the-easiest-way-to-resize-optimize-an-image-size-with-the-iphone-sdk saving them to the local iPhone disk. Some of those images are pretty big in size widths larger than 500 pixels for instance . Since the iPhone doesn't even have a big enough display to show the image in its original size I'm planning on resizing.. your UIImage and do the following NSData dataForJPEGFile UIImageJPEGRepresentation theImage 0.6 This creates an NSData instance containing the raw bytes for a JPEG image at a 60 quality setting. The contents of that NSData instance can then be written..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c like this @implementation MyClass void windowDidMove NSNotification notification ... @end Then you could create an instance of MyClass and assign it as the window's delegate MyClass myDelegate MyClass alloc init window setDelegate myDelegate On..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c of thumb is that if I want to hang on to an object for some length of time if it's a member variable in a class for instance then I need to make sure the object's reference count knows about me. As described above an object's reference count is..
What is the best way to deal with the NSDateFormatter locale “feature”? http://stackoverflow.com/questions/6613110/what-is-the-best-way-to-deal-with-the-nsdateformatter-locale-feature release Not too bad in onsies twosies but I'm dealing with about ten different apps and the first one I look at has 43 instances of this scenario. So any clever ideas for a macro overridden class whatever to minimize the effort to change everything.. the OS. In case you're always using the same date format s you could also add category methods that return singleton instances with certain configurations something like sharedRFC3339DateFormatter . Be aware however that NSDateFormatter is not thread..
When do you make an underscore in front of an instance variable? [duplicate] http://stackoverflow.com/questions/837559/when-do-you-make-an-underscore-in-front-of-an-instance-variable do you make an underscore in front of an instance variable duplicate Possible Duplicate How does an underscore in front of a variable in a cocoa objective c class work I've..
iPhone: How to load a View using a nib file created with Interface Builder http://stackoverflow.com/questions/863321/iphone-how-to-load-a-view-using-a-nib-file-created-with-interface-builder that you want to load and handle the nib create an IBOutlet property that will hold the loaded nib's view for instance in MyViewController a UIViewController subclass @property nonatomic retain IBOutlet UIView myViewFromNib dont forget to..
Optimizing CLLocationManager/CoreLocation to retrieve data points faster on the iPhone http://stackoverflow.com/questions/1081219/optimizing-cllocationmanager-corelocation-to-retrieve-data-points-faster-on-the Apps and trial and error this is what I've figured out 1 Use a singleton class for the locationManager ONLY ONE Instance follow the examples in Apple's LocateMe example Tweetero http tweetero.googlecode.com svn trunk I'm thinking you can only.. Follow the example in Apple's code for this in the FlipsideViewController MyCLController sharedInstance .locationManager.desiredAccuracy accuracyToSet MyCLController sharedInstance .locationManager.distanceFilter filterToSet.. MyCLController sharedInstance .locationManager.desiredAccuracy accuracyToSet MyCLController sharedInstance .locationManager.distanceFilter filterToSet This approach works and causes no errors. If you update the desiredAccuracy..
UIWebView to view self signed websites (No private api, not NSURLConnection) - is it possible? http://stackoverflow.com/questions/11573164/uiwebview-to-view-self-signed-websites-no-private-api-not-nsurlconnection-i work now because we've already got through the server authentication Here are the relevant code snippets below. Note Instance variables you will see are of the following type UIWebView _web NSURLConnection _urlConnection NSURLRequest _request I use..
Declaration/definition of variables locations in ObjectiveC? http://stackoverflow.com/questions/12632285/declaration-definition-of-variables-locations-in-objectivec way ivars and properties can be declared. Before modern Objective C in old Obj C 2.0 you didn't have a lot of choices. Instance variables used to be declared in the header between the curly brackets MyClass.h @interface MyClass NSObject int myVar @end..
How to display DICOM files in a view on iPhone [duplicate] http://stackoverflow.com/questions/14642063/how-to-display-dicom-files-in-a-view-on-iphone the dataset is the the set of element we are interested in gdcm DataSet ds file.GetDataSet const Tag studyInstance 0x0020 0x000d Study Instance UID const DataElement dicomVal ds.GetDataElement studyInstance std string stringVal dicomVal.GetByteValue.. the set of element we are interested in gdcm DataSet ds file.GetDataSet const Tag studyInstance 0x0020 0x000d Study Instance UID const DataElement dicomVal ds.GetDataElement studyInstance std string stringVal dicomVal.GetByteValue GetPointer dicomVal.GetByteValue.. const Tag studyInstance 0x0020 0x000d Study Instance UID const DataElement dicomVal ds.GetDataElement studyInstance std string stringVal dicomVal.GetByteValue GetPointer dicomVal.GetByteValue GetLength NSString val NSString stringWithCString..
Core Data: UIManagedDocument or AppDelegate to setup core data stack? http://stackoverflow.com/questions/14876988/core-data-uimanageddocument-or-appdelegate-to-setup-core-data-stack my MOC around between the viewcontrollers. But would it be better to migrate to UIManagedDocument and make a shared Instance so I don't have to pass the MOC around all the time And also because its newer iphone ios objective c core data sdk share.. the Data Model onto the DB void saveContext DataAccessLayer singleton instance shared across application id sharedInstance void disposeInstance Returns the managed object context for the application. If the context doesn't already exist it is.. the DB void saveContext DataAccessLayer singleton instance shared across application id sharedInstance void disposeInstance Returns the managed object context for the application. If the context doesn't already exist it is created and bound to..
Application run on simulator but not on device in iphone http://stackoverflow.com/questions/20800108/application-run-on-simulator-but-not-on-device-in-iphone self.delegate initialSelectedIndexPath animated NO scrollPosition UITableViewScrollPositionTop #pragma mark Instance Methods void configureViewController UIViewController viewController UIButton tempButton UIButton buttonWithType UIButtonTypeCustom..
UISegmentedControl Best Practice http://stackoverflow.com/questions/2118358/uisegmentedcontrol-best-practice but you do need separate XIBs for each view. You also don't need to add anything to the containing view in IB. Instance variables in the interface of whatever class is handling all this UIViewController controllerOne UIViewController controllerTwo..
How do you pass objects between View Controllers in Objective-C? http://stackoverflow.com/questions/2770460/how-do-you-pass-objects-between-view-controllers-in-objective-c I've come to know. I didn't ever really read the XCode error warnings but there it was even if not quite plain English Instance variable 'blah' accessed in class method. My question What am I supposed to do now I've got two View Controllers that need..
Create a Core Date Entity Instance But not want it to be stored(non-persistent) http://stackoverflow.com/questions/3751340/create-a-core-date-entity-instance-but-not-want-it-to-be-storednon-persistent a Core Date Entity Instance But not want it to be stored non persistent Sometimes I need instantiate CoreDateEntity to store some infomations for temporarily..
How do I extract pixel data from DICOM files on iOS? http://stackoverflow.com/questions/5278743/how-do-i-extract-pixel-data-from-dicom-files-on-ios the dataset is the the set of element we are interested in gdcm DataSet ds file.GetDataSet const Tag studyInstance 0x0020 0x000d Study Instance UID const DataElement dicomVal ds.GetDataElement studyInstance std string stringVal dicomVal.GetByteValue.. the set of element we are interested in gdcm DataSet ds file.GetDataSet const Tag studyInstance 0x0020 0x000d Study Instance UID const DataElement dicomVal ds.GetDataElement studyInstance std string stringVal dicomVal.GetByteValue GetPointer dicomVal.GetByteValue.. const Tag studyInstance 0x0020 0x000d Study Instance UID const DataElement dicomVal ds.GetDataElement studyInstance std string stringVal dicomVal.GetByteValue GetPointer dicomVal.GetByteValue GetLength NSString val NSString stringWithCString..
What are the key concepts for an iPhone Developer to learn? [closed] http://stackoverflow.com/questions/5677655/what-are-the-key-concepts-for-an-iphone-developer-to-learn often have a special initializer. Instead of the usual Class alloc init singletons often use SingletonClass sharedInstance . shared Instance since the instance is shared across your application. Note that Singleton classes work a little differently.. special initializer. Instead of the usual Class alloc init singletons often use SingletonClass sharedInstance . shared Instance since the instance is shared across your application. Note that Singleton classes work a little differently in regards to..
How to declare instance variables and methods not visible or usable outside of the class instance? http://stackoverflow.com/questions/5826345/how-to-declare-instance-variables-and-methods-not-visible-or-usable-outside-of-t as an answer to another question on Stack Overflow Does a private @property create an @private instance variable Edit Instance variables in class extensions were presented in WWDC 2010 session 144. Edit Using the Clang LLVM 2.0 compiler you can also..
http://stackoverflow.com/questions/6124109/instance-variables-with-underscore-in-objective-c-2-0-and-renaming-with-synthet variables with underscore in Objective C 2.0 and renaming with @synthetize leads to optimization warnings by the 'Analyze'.. aBar instead of using bar aBar The 'Analyse' tool introduced by Xcode 4 gives me this warning I'm using version 4.0.2 Instance variable 'bar' in class 'Foo' is never used by the methods in its @implementation although it may be used by category methods..
iOS - How to implement a performSelector with multiple arguments and with afterDelay? http://stackoverflow.com/questions/8439052/ios-how-to-implement-a-performselector-with-multiple-arguments-and-with-afterd fooFirstInput secondInput withObject @ first withObject @ second afterDelay 15.0 But that gives me an error saying Instance method performSelector withObject withObject afterDelay not found Any ideas as to what I am missing iphone ios selector..
sqlite database update when app version changes on Appstore in iPhone http://stackoverflow.com/questions/8794397/sqlite-database-update-when-app-version-changes-on-appstore-in-iphone to save the value of this constant in the Documents folder for future references therefore I use a Shared Data Instance. In the viewDidLoad I do the following test if first time run of this version if MyDataModel sharedInstance .count FirstTime.. Data Instance. In the viewDidLoad I do the following test if first time run of this version if MyDataModel sharedInstance .count FirstTime 1 do what you need to do as the first time load for this version MyDataModel sharedInstance .count save.. sharedInstance .count FirstTime 1 do what you need to do as the first time load for this version MyDataModel sharedInstance .count save the count value to disk so on next run you are not first time this means count 1 Now the trick is on your new..
Why is there no autorelease pool when I do performSelectorInBackground:? http://stackoverflow.com/questions/929485/why-is-there-no-autorelease-pool-when-i-do-performselectorinbackground I suspect the parameter but I don't know why the compiler complains about an NSCFNumber. Am I missing something My Instance variables are all nonatomic . Can that be a problem UPDATE I may also suspect that some variable has been added to an autorelease..
What is code for upload the NSMutableArray data to TableView? [closed] http://stackoverflow.com/questions/9493280/what-is-code-for-upload-the-nsmutablearray-data-to-tableview in your Array NSMutableArray . You can show these data in TableView For this you have to follow below Steps 1 Create Instance of UItableView in .h class AS UITableView myTableView 2 Adopt The UITableViewDataSource UITableViewDelegate protocol in..
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