pragma mark -------UITextViewDelegate

-(BOOL) textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
if ([textView isFirstResponder]) {

        if ([[[textView textInputMode] primaryLanguage] isEqualToString:@"emoji"] || ![[textView textInputMode] primaryLanguage]) {
               return NO;
        }
        
        //判断键盘是不是九宫格键盘
        if ([self isNineKeyBoard:text] ){
            return YES;
        }else{
            if ([self hasEmoji:text] || [self stringContainsEmoji:text]){
                return NO;
            }
        }
    }
    return YES;
}
/**
 * 利用下面这个方法stringContainsEmoji可以限制系统键盘自带的表情
 *  判断字符串中是否存在emoji
 * @param string 字符串
 * @return YES(含有表情)
 */

• (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;
  }
  /**

  • 利用下面这个方法hasEmoji可以限制第三方键盘（常用的是搜狗键盘）的表情
  • 判断字符串中是否存在emoji
  • @param string 字符串
  • @return YES(含有表情)
    */

• (BOOL)hasEmoji:(NSString*)string;
  {
  NSString pattern = @"[^\u0020-\u007E\u00A0-\u00BE\u2E80-\uA4CF\uF900-\uFAFF\uFE30-\uFE4F\uFF00-\uFFEF\u0080-\u009F\u2000-\u201f\r\n]";
  NSPredicate pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", pattern];
  BOOL isMatch = [pred evaluateWithObject:string];
  return isMatch;
  }
  /

  • 利用下面这个方法isNineKeyBoard可以判断当前是不是在使用九宫格输入
  • 判断是不是九宫格
  • @param string 输入的字符
  • @return YES(是九宫格拼音键盘)
    */
    -(BOOL)isNineKeyBoard:(NSString *)string
    {
    NSString *other = @"➋➌➍➎➏➐➑➒";
    int len = (int)string.length;
    for(int i=0;i<len;i++)
    {
    if(!([other rangeOfString:string].location != NSNotFound))
    return NO;
    }
    return YES;
    }