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2014/10/15 ¤U¤È 10:10:15
iphone Programming Glossary: indexThe best way to remove duplicate values from NSMutableArray in Objective-C? http://stackoverflow.com/questions/1025674/the-best-way-to-remove-duplicate-values-from-nsmutablearray-in-objective-c are worried about the order loop over a copy of the array NSArray copy mutableArray copy NSInteger index copy count 1 for id object in copy reverseObjectEnumerator if mutableArray indexOfObject object inRange.. copy NSInteger index copy count 1 for id object in copy reverseObjectEnumerator if mutableArray indexOfObject object inRange NSMakeRange 0 index NSNotFound mutableArray removeObjectAtIndex index index copy..
Retrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage context CGRectMake 0 0 width height image CGContextRelease context I then calculate the array index for the given alpha channel using the coordinates from the UIImageView. int byteIndex bytesPerRow uiViewPoint.y..
Difference between objectForKey and valueForKey? http://stackoverflow.com/questions/1062183/difference-between-objectforkey-and-valueforkey method. An NSDictionary is a collection class similar to an NSArray except instead of using indexes it uses keys to differentiate between items. A key is an arbitrary string you provide. No two objects.. No two objects can have the same key just as no two objects in an NSArray can have the same index . valueForKey is a KVC method. It works with ANY class. valueForKey allows you to access a property..
How to implement re-ordering of CoreData records? http://stackoverflow.com/questions/1077568/how-to-implement-re-ordering-of-coredata-records thought of using another column to store the order info but using contiguous numbers for ordering index has a problem. if I am dealing with lots of data reordering a record potentially involves updating a.. NSFetchedResultsController controller didChangeObject id anObject atIndexPath NSIndexPath indexPath forChangeType NSFetchedResultsChangeType type newIndexPath NSIndexPath newIndexPath if userDrivenDataModelChange..
Verify receipt for in App purchase http://stackoverflow.com/questions/1298998/verify-receipt-for-in-app-purchase 3 NSInteger value 0 for NSInteger j i j i 3 j value 8 if j length value 0xFF input j NSInteger index i 3 4 output index 0 table value 18 0x3F output index 1 table value 12 0x3F output index 2 i 1 length.. for NSInteger j i j i 3 j value 8 if j length value 0xFF input j NSInteger index i 3 4 output index 0 table value 18 0x3F output index 1 table value 12 0x3F output index 2 i 1 length table value 6 0x3F.. if j length value 0xFF input j NSInteger index i 3 4 output index 0 table value 18 0x3F output index 1 table value 12 0x3F output index 2 i 1 length table value 6 0x3F ' ' output index 3 i 2 length table..
http://stackoverflow.com/questions/1349740/arguments-in-selector atIndex the indices for arguments to be passed to the method set as the selector start at index 2. From the docs Indices 0 and 1 indicate the hidden arguments self and _cmd respectively you should..
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 each unit as 3 bytes 1 pixel . pixelData RGBPixel pixelByteData Now you can access pixels by index pixelData index NSLog @ Pixel data one red i green i blue i . pixelData 0 .red pixelData 0 .green pixelData.. as 3 bytes 1 pixel . pixelData RGBPixel pixelByteData Now you can access pixels by index pixelData index NSLog @ Pixel data one red i green i blue i . pixelData 0 .red pixelData 0 .green pixelData 0 .blue.. i blue i . pixelData 0 .red pixelData 0 .green pixelData 0 .blue You can determine the desired index by multiplying row column. return pixelData Step 5. I made an accessor method RGBPixel pixelDataForRow..
Detecting which UIButton was pressed in a UITableView http://stackoverflow.com/questions/1802707/detecting-which-uibutton-was-pressed-in-a-uitableview up as follows UITableViewCell tableView UITableView tableView cellForRowAtIndexPath NSIndexPath indexPath NSString identifier @ identifier UITableViewCell cell tableView dequeueReusableCellWithIdentifier.. using tags but I'm not sure this is the best route. I'd like to be able to somehow tag the indexPath onto the control. void buttonPressedAction id sender UIButton button UIButton sender how do I know.. how do I know which button sent this message processing button press for this row requires an indexPath. What's the standard way of doing this Edit I've kinda solved it by doing the following. I would..
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar http://stackoverflow.com/questions/4471289/how-to-filter-nsfetchedresultscontroller-coredata-with-uisearchdisplaycontroll nil self.searchFetchedResultsController nil if you care about the scope save off the index to be used by the serchFetchedResultsController self.savedScopeButtonIndex scope #pragma mark #pragma.. switch type case NSFetchedResultsChangeInsert tableView insertSections NSIndexSet indexSetWithIndex sectionIndex withRowAnimation UITableViewRowAnimationFade break case NSFetchedResultsChangeDelete.. break case NSFetchedResultsChangeDelete tableView deleteSections NSIndexSet indexSetWithIndex sectionIndex withRowAnimation UITableViewRowAnimationFade break void controller NSFetchedResultsController..
The best way to remove duplicate values from NSMutableArray in Objective-C? http://stackoverflow.com/questions/1025674/the-best-way-to-remove-duplicate-values-from-nsmutablearray-in-objective-c aren't you storing them in an NSSet to begin with If you are worried about the order loop over a copy of the array NSArray copy mutableArray copy NSInteger index copy count 1 for id object in copy reverseObjectEnumerator if mutableArray indexOfObject object inRange NSMakeRange 0 index NSNotFound mutableArray removeObjectAtIndex..
Retrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage CGColorSpaceRelease colorSpace CGContextDrawImage context CGRectMake 0 0 width height image CGContextRelease context I then calculate the array index for the given alpha channel using the coordinates from the UIImageView. int byteIndex bytesPerRow uiViewPoint.y uiViewPoint.x bytesPerPixel unsigned char alpha..
Difference between objectForKey and valueForKey? http://stackoverflow.com/questions/1062183/difference-between-objectforkey-and-valueforkey share improve this question objectForKey is an NSDictionary method. An NSDictionary is a collection class similar to an NSArray except instead of using indexes it uses keys to differentiate between items. A key is an arbitrary string you provide. No two objects can have the same key just as no two objects in an NSArray.. between items. A key is an arbitrary string you provide. No two objects can have the same key just as no two objects in an NSArray can have the same index . valueForKey is a KVC method. It works with ANY class. valueForKey allows you to access a property using a string for its name. So for instance if I have an Account..
How to implement re-ordering of CoreData records? http://stackoverflow.com/questions/1077568/how-to-implement-re-ordering-of-coredata-records an automatic way of allowing you to reorder the records. I thought of using another column to store the order info but using contiguous numbers for ordering index has a problem. if I am dealing with lots of data reordering a record potentially involves updating a lot of records on the ordering info it's sorta like changing.. controller if userDrivenDataModelChange return ... void controller NSFetchedResultsController controller didChangeObject id anObject atIndexPath NSIndexPath indexPath forChangeType NSFetchedResultsChangeType type newIndexPath NSIndexPath newIndexPath if userDrivenDataModelChange return ... void controllerDidChangeContent..
Verify receipt for in App purchase http://stackoverflow.com/questions/1298998/verify-receipt-for-in-app-purchase uint8_t data.mutableBytes for NSInteger i 0 i length i 3 NSInteger value 0 for NSInteger j i j i 3 j value 8 if j length value 0xFF input j NSInteger index i 3 4 output index 0 table value 18 0x3F output index 1 table value 12 0x3F output index 2 i 1 length table value 6 0x3F ' ' output index 3 i 2 length table value.. for NSInteger i 0 i length i 3 NSInteger value 0 for NSInteger j i j i 3 j value 8 if j length value 0xFF input j NSInteger index i 3 4 output index 0 table value 18 0x3F output index 1 table value 12 0x3F output index 2 i 1 length table value 6 0x3F ' ' output index 3 i 2 length table value 0 0x3F ' ' return.. i 3 NSInteger value 0 for NSInteger j i j i 3 j value 8 if j length value 0xFF input j NSInteger index i 3 4 output index 0 table value 18 0x3F output index 1 table value 12 0x3F output index 2 i 1 length table value 6 0x3F ' ' output index 3 i 2 length table value 0 0x3F ' ' return NSString alloc initWithData data..
http://stackoverflow.com/questions/1349740/arguments-in-selector for you to be passed to NSInvocation . Also to note with setArgument atIndex the indices for arguments to be passed to the method set as the selector start at index 2. From the docs Indices 0 and 1 indicate the hidden arguments self and _cmd respectively you should set these values directly with the setTarget and setSelector..
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 instead of dividing each unit as 1 byte we will divide each unit as 3 bytes 1 pixel . pixelData RGBPixel pixelByteData Now you can access pixels by index pixelData index NSLog @ Pixel data one red i green i blue i . pixelData 0 .red pixelData 0 .green pixelData 0 .blue You can determine the desired index by multiplying.. of dividing each unit as 1 byte we will divide each unit as 3 bytes 1 pixel . pixelData RGBPixel pixelByteData Now you can access pixels by index pixelData index NSLog @ Pixel data one red i green i blue i . pixelData 0 .red pixelData 0 .green pixelData 0 .blue You can determine the desired index by multiplying row column... by index pixelData index NSLog @ Pixel data one red i green i blue i . pixelData 0 .red pixelData 0 .green pixelData 0 .blue You can determine the desired index by multiplying row column. return pixelData Step 5. I made an accessor method RGBPixel pixelDataForRow int row column int column Return a pointer to the pixel data..
Detecting which UIButton was pressed in a UITableView http://stackoverflow.com/questions/1802707/detecting-which-uibutton-was-pressed-in-a-uitableview UITableViewCells . Each cell contains a UIButton which is set up as follows UITableViewCell tableView UITableView tableView cellForRowAtIndexPath NSIndexPath indexPath NSString identifier @ identifier UITableViewCell cell tableView dequeueReusableCellWithIdentifier identifier if cell nil cell UITableView alloc initWithStyle.. method how do I know which button has been pressed. I've considered using tags but I'm not sure this is the best route. I'd like to be able to somehow tag the indexPath onto the control. void buttonPressedAction id sender UIButton button UIButton sender how do I know which button sent this message processing button press for.. buttonPressedAction id sender UIButton button UIButton sender how do I know which button sent this message processing button press for this row requires an indexPath. What's the standard way of doing this Edit I've kinda solved it by doing the following. I would still like to have an opinion whether this is the standard..
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar http://stackoverflow.com/questions/4471289/how-to-filter-nsfetchedresultscontroller-coredata-with-uisearchdisplaycontroll the relevant search info self.searchFetchedResultsController.delegate nil self.searchFetchedResultsController nil if you care about the scope save off the index to be used by the serchFetchedResultsController self.savedScopeButtonIndex scope #pragma mark #pragma mark Search Bar void searchDisplayController UISearchDisplayController.. self.tableView self.searchDisplayController.searchResultsTableView switch type case NSFetchedResultsChangeInsert tableView insertSections NSIndexSet indexSetWithIndex sectionIndex withRowAnimation UITableViewRowAnimationFade break case NSFetchedResultsChangeDelete tableView deleteSections NSIndexSet indexSetWithIndex.. indexSetWithIndex sectionIndex withRowAnimation UITableViewRowAnimationFade break case NSFetchedResultsChangeDelete tableView deleteSections NSIndexSet indexSetWithIndex sectionIndex withRowAnimation UITableViewRowAnimationFade break void controller NSFetchedResultsController controller didChangeObject id anObject atIndexPath..
The best way to remove duplicate values from NSMutableArray in Objective-C? http://stackoverflow.com/questions/1025674/the-best-way-to-remove-duplicate-values-from-nsmutablearray-in-objective-c begin with If you are worried about the order loop over a copy of the array NSArray copy mutableArray copy NSInteger index copy count 1 for id object in copy reverseObjectEnumerator if mutableArray indexOfObject object inRange NSMakeRange 0 index.. copy mutableArray copy NSInteger index copy count 1 for id object in copy reverseObjectEnumerator if mutableArray indexOfObject object inRange NSMakeRange 0 index NSNotFound mutableArray removeObjectAtIndex index index copy release share..
Retrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage CGContextDrawImage context CGRectMake 0 0 width height image CGContextRelease context I then calculate the array index for the given alpha channel using the coordinates from the UIImageView. int byteIndex bytesPerRow uiViewPoint.y uiViewPoint.x..
Difference between objectForKey and valueForKey? http://stackoverflow.com/questions/1062183/difference-between-objectforkey-and-valueforkey is an NSDictionary method. An NSDictionary is a collection class similar to an NSArray except instead of using indexes it uses keys to differentiate between items. A key is an arbitrary string you provide. No two objects can have the same.. string you provide. No two objects can have the same key just as no two objects in an NSArray can have the same index . valueForKey is a KVC method. It works with ANY class. valueForKey allows you to access a property using a string for its..
How to implement re-ordering of CoreData records? http://stackoverflow.com/questions/1077568/how-to-implement-re-ordering-of-coredata-records the records. I thought of using another column to store the order info but using contiguous numbers for ordering index has a problem. if I am dealing with lots of data reordering a record potentially involves updating a lot of records on the.. return ... void controller NSFetchedResultsController controller didChangeObject id anObject atIndexPath NSIndexPath indexPath forChangeType NSFetchedResultsChangeType type newIndexPath NSIndexPath newIndexPath if userDrivenDataModelChange return..
Verify receipt for in App purchase http://stackoverflow.com/questions/1298998/verify-receipt-for-in-app-purchase i 0 i length i 3 NSInteger value 0 for NSInteger j i j i 3 j value 8 if j length value 0xFF input j NSInteger index i 3 4 output index 0 table value 18 0x3F output index 1 table value 12 0x3F output index 2 i 1 length table value 6 0x3F.. 3 NSInteger value 0 for NSInteger j i j i 3 j value 8 if j length value 0xFF input j NSInteger index i 3 4 output index 0 table value 18 0x3F output index 1 table value 12 0x3F output index 2 i 1 length table value 6 0x3F ' ' output index.. i j i 3 j value 8 if j length value 0xFF input j NSInteger index i 3 4 output index 0 table value 18 0x3F output index 1 table value 12 0x3F output index 2 i 1 length table value 6 0x3F ' ' output index 3 i 2 length table value 0 0x3F ' '..
http://stackoverflow.com/questions/1349740/arguments-in-selector to note with setArgument atIndex the indices for arguments to be passed to the method set as the selector start at index 2. From the docs Indices 0 and 1 indicate the hidden arguments self and _cmd respectively you should set these values directly..
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 as 1 byte we will divide each unit as 3 bytes 1 pixel . pixelData RGBPixel pixelByteData Now you can access pixels by index pixelData index NSLog @ Pixel data one red i green i blue i . pixelData 0 .red pixelData 0 .green pixelData 0 .blue You.. divide each unit as 3 bytes 1 pixel . pixelData RGBPixel pixelByteData Now you can access pixels by index pixelData index NSLog @ Pixel data one red i green i blue i . pixelData 0 .red pixelData 0 .green pixelData 0 .blue You can determine the.. data one red i green i blue i . pixelData 0 .red pixelData 0 .green pixelData 0 .blue You can determine the desired index by multiplying row column. return pixelData Step 5. I made an accessor method RGBPixel pixelDataForRow int row column int..
Detecting which UIButton was pressed in a UITableView http://stackoverflow.com/questions/1802707/detecting-which-uibutton-was-pressed-in-a-uitableview UIButton which is set up as follows UITableViewCell tableView UITableView tableView cellForRowAtIndexPath NSIndexPath indexPath NSString identifier @ identifier UITableViewCell cell tableView dequeueReusableCellWithIdentifier identifier if cell.. pressed. I've considered using tags but I'm not sure this is the best route. I'd like to be able to somehow tag the indexPath onto the control. void buttonPressedAction id sender UIButton button UIButton sender how do I know which button sent.. button UIButton sender how do I know which button sent this message processing button press for this row requires an indexPath. What's the standard way of doing this Edit I've kinda solved it by doing the following. I would still like to have..
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar http://stackoverflow.com/questions/4471289/how-to-filter-nsfetchedresultscontroller-coredata-with-uisearchdisplaycontroll nil self.searchFetchedResultsController nil if you care about the scope save off the index to be used by the serchFetchedResultsController self.savedScopeButtonIndex scope #pragma mark #pragma mark Search Bar void.. switch type case NSFetchedResultsChangeInsert tableView insertSections NSIndexSet indexSetWithIndex sectionIndex withRowAnimation UITableViewRowAnimationFade break case NSFetchedResultsChangeDelete tableView.. UITableViewRowAnimationFade break case NSFetchedResultsChangeDelete tableView deleteSections NSIndexSet indexSetWithIndex sectionIndex withRowAnimation UITableViewRowAnimationFade break void controller NSFetchedResultsController controller..
Changing the size of the UISearchBar TextField? http://stackoverflow.com/questions/556814/changing-the-size-of-the-uisearchbar-textfield of the UISearchBar TextField I have a UITableView with an Index on the side I want to add a UISearchBar to it but the index overlaps with the x to clear the search. I've noticed in the Contacts application the textfield within the UISearchBar is.. so that it abuts the N B. That's it. You can enable a cancel button if you want too and it also won't overlap the index remains within the search bar . Apparently a Table View can only have 1 subview in its header that's why you need to put.. Bar inside it. UPDATE see Beginning iPhone Development from Apress p. 241 of SDK 3 edition. You just disable the index while searching. NSArray sectionIndexTitlesForTableView UITableView tableView if isSearching return nil return keys Also..
How to Find Duplicate Values in Arrays? http://stackoverflow.com/questions/10280676/how-to-find-duplicate-values-in-arrays SQLite and I have written a query which returns me two arrays ItemsArray and CustomersIDArray as ItemsArray Element at Index 0 Off White Element at Index 1 Fan Element at Index 2 Off White Element at Index 3 Delux Element at Index 4 Fan CustomerIDArray.. which returns me two arrays ItemsArray and CustomersIDArray as ItemsArray Element at Index 0 Off White Element at Index 1 Fan Element at Index 2 Off White Element at Index 3 Delux Element at Index 4 Fan CustomerIDArray Element at Index 0 1.. arrays ItemsArray and CustomersIDArray as ItemsArray Element at Index 0 Off White Element at Index 1 Fan Element at Index 2 Off White Element at Index 3 Delux Element at Index 4 Fan CustomerIDArray Element at Index 0 1 Element at Index 1 2 Element..
SQL Query for Performing Radius Search based on Latitude Longitude http://stackoverflow.com/questions/1727137/sql-query-for-performing-radius-search-based-on-latitude-longitude the more complicated WHERE clause test on the smaller subset of records that are within that Lat Long square. With an Index on Lat Long in the database the query WHERE MyLat @MinLat AND MyLat @MaxLat AND MyLong @MinLong AND MyLong @MaxLong should..
Properly zooming a UIScrollView that contains many subviews http://stackoverflow.com/questions/1835941/properly-zooming-a-uiscrollview-that-contains-many-subviews as a single subview to the scrollview... Then in the viewForZoomingInScrollView delegate method return the object at Index 0 UIView viewForZoomingInScrollView UIScrollView scrollView return self.scrollView.subviews objectAtIndex 0 share improve..
how to compile spatialite for iOS http://stackoverflow.com/questions/4793970/how-to-compile-spatialite-for-ios direct Shapefile access 'VirtualText direct CSV TXT access 'VirtualNetwork Dijkstra shortest path 'RTree' Spatial Index R Tree 'MbrCache' Spatial Index MBR cache 'VirtualFDO' FDO OGR interoperability 'SpatiaLite' Spatial SQL OGC PROJ.4 version.. direct CSV TXT access 'VirtualNetwork Dijkstra shortest path 'RTree' Spatial Index R Tree 'MbrCache' Spatial Index MBR cache 'VirtualFDO' FDO OGR interoperability 'SpatiaLite' Spatial SQL OGC PROJ.4 version ...... Rel. 4.6.1 21 August..
Changing the size of the UISearchBar TextField? http://stackoverflow.com/questions/556814/changing-the-size-of-the-uisearchbar-textfield the size of the UISearchBar TextField I have a UITableView with an Index on the side I want to add a UISearchBar to it but the index overlaps with the x to clear the search. I've noticed in the.. in my viewDidLoad but it does not seem to work. UITextField textField UITextField self.search subviews objectAtIndex 0 CGRect r textField.frame textField setFrame CGRectMake r.origin.x r.origin.y r.size.height r.size.width 30 Any ideas .. iPhone Development from Apress p. 241 of SDK 3 edition. You just disable the index while searching. NSArray sectionIndexTitlesForTableView UITableView tableView if isSearching return nil return keys Also they talk about adding a magnifying glass..
Getting Index of an Object from NSArray? http://stackoverflow.com/questions/7398141/getting-index-of-an-object-from-nsarray Index of an Object from NSArray i am trying to get index of an array through indexOfObject method as follows but when i try to.. Equality is tested using isEqual method. The garbage value you get is probably equal to NSNotFound . Try testing anIndex against it. The number you are looking for isn't probably in your array NSNumber num NSNumber numberWithInteger 56 NSInteger.. it. The number you are looking for isn't probably in your array NSNumber num NSNumber numberWithInteger 56 NSInteger anIndex myArray indexOfObject num if NSNotFound anIndex NSLog @ not found or log the content of the array to be sure NSLog @ @ myArray..
Is ARC really supported in iOS 4? The iOS 4.2 SDK is missing ARC-related symbols at linking time http://stackoverflow.com/questions/7747783/is-arc-really-supported-in-ios-4-the-ios-4-2-sdk-is-missing-arc-related-symbols in 4.x is automatic weak reference zeroing. See Apple's documentation here for the Objective C Feature Availability Index. Xcode 4.4 and 4.5 can be used to submit apps. Note that NSDictionary and NSArray subscripting deploys back to OS X 10.6..
How to save nsdictionary of a subview to a mainview based off tableviewcell selection http://stackoverflow.com/questions/7922305/how-to-save-nsdictionary-of-a-subview-to-a-mainview-based-off-tableviewcell-sele index scroller. The method below shows how I am doing this. method to sort array and split for use with uitableview Index IBAction startSortingTheArray NSArray arrayData If you need to sort incoming array alphabetically use this line of code.. arrayData self.letterDictionary NSMutableDictionary dictionary sectionLetterArray NSMutableArray alloc init Index scrolling Iterate over values for future use for NSString value in sortedArray Get the first letter and its associated.. of the array. Display cells with data NSArray keys self.letterDictionary objectForKey self.sectionLetterArray objectAtIndex indexPath.section NSString key keys objectAtIndex indexPath.row cell.textLabel.text key when the cell is then selected the..
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