Filter Emoji in NSString and NSStringEmoji

Filter Emoji in NSString and NSStringEmoji

Sometimes, because of project requirements, you need to filter emoji in NSString.
For example:

• To communicate with android, android does not support this function yet.
• Content is sent as a text message.

The idea is as follows: traverse each NSString character and replace it with another character. Print each character:

NSRange range;    for(NSInteger i = 0; i < length; i += range.length) {        range = [string rangeOfComposedCharacterSequenceAtIndex:i];        NSString *composedString = [string substringWithRange:range];        NSLog(@"i = %@, ch = %@", @(i), composedString);    }`

How to judgecomposedStringWhat about emoji?

• Method 1: find it in the emoji dictionary. It is not ideal to load a comprehensive emoji.
• Method 2: whether it is a normal character, that is, it is not emoji.

Determine whether the current Code point is emoji.

- (BOOL)isNotEmoji:(UInt64) codePoint {    return (codePoint == 0x0)    || (codePoint == 0x9)    || (codePoint == 0xA)    || (codePoint == 0xD)    || ((codePoint >= 0x20) && (codePoint <= 0xD7FF))    || ((codePoint >= 0xFF00) && (codePoint <=                                  0xFFFF));}

Based on the above two methods, I wrote an NSString extension class:
NSString + YFEmoji

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