知识片段---禁止输入系统表情

ゞ浴缸里的玫瑰 2022-08-20 02:27 134阅读 0赞

/\*\*  
 \*   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 ;