iOS 判斷字串是否包含空格

有時候需要對註冊，登入，忘記密碼的密碼進行是否包含空格進行判斷
我就自己封裝了一個方法,可以根據返回的bool值進行判斷

-(BOOL)isEmpty:(NSString *) str {
    NSRange range = [str rangeOfString:@" "];
    if (range.location != NSNotFound) {
        return  YES; //yes代表包含空格
    }else {
        return  NO;  //反之
    }
}

例子

NSString *_string = [NSString stringWithFormat:@"123 456"];
NSRange _range = [_string rangeOfString:@" "];
if (_range.location != NSNotFound) {
      //有空格
}else {
      //沒有空格
}

例子

//判斷內容是否全部為空白格  yes 全部為空白格  no 不是
+ (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;
        }
    }
}