ios 判断字符串是否全部空格

最新推荐文章于 2021-12-20 15:08:29 发布

lishiyong92

最新推荐文章于 2021-12-20 15:08:29 发布

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本文介绍了一种Objective-C中判断字符串是否为空或仅包含空白字符的方法。通过使用`NSCharacterSet`来定义空白字符集，并利用`stringByTrimmingCharactersInSet`去除字符串两端空白字符，进而判断处理后的字符串长度是否为零。

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 + ( 
 BOOL 
 ) isEmpty:( 
 NSString 
  *) str { 
 
 if 
  (!str) { 
 
 return 
  true 
 ; 
 
 }  
 else 
  { 
 
 //A character set containing only the whitespace characters space (U+0020) and tab (U+0009) and the newline and nextline characters (U+000A–U+000D, U+0085). 
 
 NSCharacterSet 
  *set = [ 
 NSCharacterSet 
  whitespaceAndNewlineCharacterSet]; 
 
 //Returns a new string made by removing from both ends of the receiver characters contained in a given character set. 
 
 NSString 
  *trimedString = [str stringByTrimmingCharactersInSet:set]; 
 
 if 
  ([trimedString length] == 0) { 
 
 return 
  true 
 ; 
 
 }  
 else 
  { 
 
 return 
  false 
 ; 
 
 } 
 
 } 
 
 }