知识片段---禁止输入系统表情-蒲公英云

知识片段---禁止输入系统表情

/**
* 时时查询输入框有没有表情
*
*/
- ( BOOL )textField:( UITextField *) textField shouldChangeCharactersInRange:( NSRange ) range replacementString:( NSString *) string
{
// 不让输入表情
if ([ textField isFirstResponder ]) {
if ([[[ textField textInputMode ] primaryLanguage ] isEqualToString : @”emoji” ] || ![[ textField textInputMode ] primaryLanguage ]) {
return NO ;
}
}
// 有没有链接表情
if ([ self stringContainsEmoji : textField . text ])
{
return NO ;
}

 return  YES ;

}
/**
* 查询输入框有没有表情
*
*/
- ( 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 ;