ios - 在文本字段中自动添加连字符但无法编辑文本字段(电话号码屏蔽)

Question

使用下面的代码，我可以自动添加连字符，但无法在文本字段中正确进行编辑。

例如，当我单击以在文本字段中已输入的数字之间插入任何数字时，这将在文本字段的末尾插入数字，并且不会正确删除该数字。谁能帮帮我？

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
  {    
     if(textField == txtUserName)
     {
         if (range.location == 12)
         {
             return NO;
         }
         if (range.length == 0 && ![[NSCharacterSet decimalDigitCharacterSet]   characterIsMember:[string characterAtIndex:0]])
         {
             return NO;
         }       
        if (range.length == 0 && (range.location == 3 || range.location == 7))
         {
             txtUserName.text = [NSString stringWithFormat:@"%@-  %@",txtUserName.text,string];
             return NO;
         }
         if (range.length == 1 &&(range.location==4 ||range.location ==7))      
         {
             range.location--;
             range.length = 2;
              txtUserName.text = [txtUserName.text  stringByReplacingCharactersInRange:range withString:@""];
             NSLog(@"Nisha..%@",txtUserName.text);
             return NO;
          }
    }   
    return YES;
}

Answer 1

当我们在 UITextField 中复制粘贴文本时，此代码也可以使用。

Warning- This code won't work with your keyboard's delete button. Anyway you need only keyboard's backspace button because Mobile keypad's delete button work like keyboard's backspace button

注意-为您的UITextField 使用tag 而不是直接将textField 与您的outlet 进行比较

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    //(textField == txtUserName)
    // don't compare with ID, use tag
    if(textField.tag == 0 ) 
    {
        NSString *text = textField.text;
        NSUInteger textLength = text.length;
        NSString *trimText = [text stringByReplacingOccurrencesOfString:@"-" withString:@""];
        NSUInteger trimTextLength = trimText.length;

        if (range.length == 0 && [string rangeOfCharacterFromSet: [[NSCharacterSet decimalDigitCharacterSet] invertedSet]].location != NSNotFound)
        {
            return NO;
        }
        if( string.length > 0 ) {
            NSString *replacedText = text;
            if(trimTextLength < 10) {
                NSInteger remainingNumbers = (10-trimTextLength);
                if(string.length > remainingNumbers) {
                    string = [string substringToIndex:remainingNumbers];
                }
                replacedText = [replacedText stringByReplacingCharactersInRange:range withString:string];
            }
            NSString *trimReplacedText = [replacedText stringByReplacingOccurrencesOfString:@"-" withString:@""];
            if( trimReplacedText.length > 3 ) {
                trimReplacedText = [trimReplacedText stringByReplacingCharactersInRange:NSMakeRange(3, 0) withString:@"-"];
            }
            if( trimReplacedText.length > 7 ) {
                trimReplacedText = [trimReplacedText stringByReplacingCharactersInRange:NSMakeRange(7, 0) withString:@"-"];
            }
            textField.text = trimReplacedText;
            return NO;
        }
        bool flag = false;
        if (range.length == 1 &&(range.location == 4 || (range.location == 7 && (textLength-trimTextLength)== 1 && [text rangeOfString:@"-"].location == 7) || (range.location == 8 && (textLength-trimTextLength)== 2) ))
        {
            range.location--;
            range.length = 2;
            flag = true;
        }
        else if (range.length >= 1)
        {
            flag = true;
        }

        if(flag) {
            NSString *replacedText = [textField.text stringByReplacingCharactersInRange:range withString:@""];

            NSString *trimReplacedText = [replacedText stringByReplacingOccurrencesOfString:@"-" withString:@""];
            if( trimReplacedText.length > 3 ) {
                trimReplacedText = [trimReplacedText stringByReplacingCharactersInRange:NSMakeRange(3, 0) withString:@"-"];
            }
            if( trimReplacedText.length > 7 ) {
                trimReplacedText = [trimReplacedText stringByReplacingCharactersInRange:NSMakeRange(7, 0) withString:@"-"];
            }
            textField.text = trimReplacedText;
            return NO;
        }
    }
    return YES;
}