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2014/10/15 ¤U¤È 10:15:27

iphone Programming Glossary: unichars

How to remove the last unicode symbol from NSString

http://stackoverflow.com/questions/11759855/how-to-remove-the-last-unicode-symbol-from-nsstring

UTF 16. Many common Unicode glyphs take up only one unichar a 16 bit unsigned value . However some glyphs take up two unichars. Even worse some glyphs can be composed or decomposed e.g.é might be one Unicode code point or it might be two an acute.. This makes it quite difficult to do what you want viz delete one character because it is really hard to tell how many unichars it takes up. Fortunately NSString has a method that helps with this rangeOfComposedCharacterSequenceAtIndex . What you need..

unichar and NSString - how interchangeable are these?

http://stackoverflow.com/questions/1354388/unichar-and-nsstring-how-interchangeable-are-these

example Not to sure about the internals of NSString but I'd guess it is probably wrapping a unichar or an array of unichars like a C char A unichar is simply a 16bit value that is used to store a character. Unlike an unsigned char which is only.. it can hold unicode characters as well which are 16bits. A NSString is a cluster of class es that contains an array of unichars EDIT Here are a few articles about what people think an NSString is http cocoawithlove.com 2008 08 string philosophies char..

How to convert ASCII value to a character in Objective-C?

http://stackoverflow.com/questions/2832729/how-to-convert-ascii-value-to-a-character-in-objective-c

this question This is how you can work with ASCII values and NSString . Note that since NSString is working with unichars there could be unexpected results for a non ASCII string. NSString to ASCII NSString string @ A int asciiCode string characterAtIndex..

Why can't Emoji display correctly in a UITextField?

http://stackoverflow.com/questions/9940278/why-cant-emoji-display-correctly-in-a-uitextfield

all too big to fit in a single iOS unichar. So when they're stored in an NSString each emoji will cover multiple unichars something to be aware of if you try to iterate over the characters in a string. If you have code like NSString emoji @ U0001F604..