iOS 获取emoji表情和拦截emoji表情

 

1 2	//将数字转为 #define EMOJI_CODE_TO_SYMBOL(x) ((((0x808080F0 | (x & 0x3F000) >> 4) | (x & 0xFC0) << 10) | (x & 0x1C0000) << 18) | (x & 0x3F) << 24);

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- (void)viewDidLoad {     [super viewDidLoad];       //单独调用     int sym = EMOJI_CODE_TO_SYMBOL(0x1F600);     NSString *emoT = [[NSString alloc] initWithBytes:&sym length:sizeof(sym) encoding:NSUTF8StringEncoding];     NSLog(@arr==%@,emoT);       //获取数组     NSArray *arrEmotion = [self defaultEmoticons];     for (NSString *str in arrEmotion) {         NSLog(@===%@,str);     } }

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//获取默认表情数组 - (NSArray *)defaultEmoticons {     NSMutableArray *array = [NSMutableArray new];     for (int i=0x1F600; i<=0x1F64F; i++) {         if (i < 0x1F641 || i > 0x1F644) {             int sym = EMOJI_CODE_TO_SYMBOL(i);             NSString *emoT = [[NSString alloc] initWithBytes:&sym length:sizeof(sym) encoding:NSUTF8StringEncoding];             [array addObject:emoT];         }     }     return array; }

为了防止输入表情符号，需要对输入的内容做检测和过滤，将苹果键盘的Emoji表情符号过滤掉。

通过研究和测试，得到以下比较完美的解决方案，思路两条：

1，当用户切换键盘为Emoji表情时，输入的表情不响应（即表情符号不显示到UITextView或UITextField）。这里可以通过UITextView或UITextField的回调和是否为emoji键盘：

1 [[[textView textInputMode] primaryLanguage] isEqualToString:@"emoji"]

来判断；

2，当用户通过中文键盘输入中文“哈哈”后出现可选文字中选中的Emoji笑脸，最后统一通过检查最终字符串textField.text的内容，通过Emoji筛unicode编码来判断是否存在Emoji表情，如果存在则提醒用户做修改。

主要的代码如下：

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
    // 不让输入表情
    if ([textView isFirstResponder]) {
        if ([[[textView textInputMode] primaryLanguage] isEqualToString:@"emoji"] || ![[textView textInputMode] primaryLanguage]) {
            return NO;
        }
    }
    
    return YES;
}

// 过滤所有表情  https://gist.github.com/cihancimen/4146056
- (BOOL)stringContainsEmoji:(NSString *)string {
    __block BOOL returnValue = NO;
    [string enumerateSubstringsInRange:NSMakeRange(0, [string length]) options:NSStringEnumerationByComposedCharacterSequences usingBlock:
     ^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
         
         const unichar hs = [substring characterAtIndex:0];
         // surrogate pair
         if (0xd800 <= hs && hs <= 0xdbff) {
             if (substring.length > 1) {
                 const unichar ls = [substring characterAtIndex:1];
                 const int uc = ((hs - 0xd800) * 0x400) + (ls - 0xdc00) + 0x10000;
                 if (0x1d000 <= uc && uc <= 0x1f77f) {
                     returnValue = YES;
                 }
             }
         } else if (substring.length > 1) {
             const unichar ls = [substring characterAtIndex:1];
             if (ls == 0x20e3) {
                 returnValue = YES;
             }
             
         } else {
             // non surrogate
             if (0x2100 <= hs && hs <= 0x27ff) {
                 returnValue = YES;
             } else if (0x2B05 <= hs && hs <= 0x2b07) {
                 returnValue = YES;
             } else if (0x2934 <= hs && hs <= 0x2935) {
                 returnValue = YES;
             } else if (0x3297 <= hs && hs <= 0x3299) {
                 returnValue = YES;
             } else if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50) {
                 returnValue = YES;
             }
         }
     }];
    
    return returnValue;
}