iOS 獲取emoji表情和攔截emoji表情

 

1 2	//將數字轉爲 #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];        //單獨調用      int sym = EMOJI_CODE_TO_SYMBOL( 0x1F600 );      NSString *emoT = [[NSString alloc] initWithBytes:&sym length:sizeof(sym) encoding:NSUTF8StringEncoding];      NSLog( @arr ==%@,emoT);        //獲取數組      NSArray *arrEmotion = [self defaultEmoticons];      for (NSString *str in arrEmotion) {          NSLog(@===%@,str);      } }

 

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//獲取默認表情數組 - (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; }

 

 

爲了防止輸入表情符號，須要對輸入的內容作檢測和過濾，將蘋果鍵盤的Emoji表情符號過濾掉。

經過研究和測試，獲得如下比較完美的解決方案，思路兩條：

1，當用戶切換鍵盤爲Emoji表情時，輸入的表情不響應（即表情符號不顯示到UITextView或UITextField）。這裏能夠經過UITextView或UITextField的回調和是否爲emoji鍵盤：

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

來判斷；

2，當用戶經過中文鍵盤輸入中文「哈哈」後出現可選文字中選中的Emoji笑臉，最後統一經過檢查最終字符串textField.text的內容，經過Emoji篩unicode編碼來判斷是否存在Emoji表情，若是存在則提醒用戶作修改。

主要的代碼以下：

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

// 過濾全部表情  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;
}