iOS UITextField实现输入手机号时自动添加空格

背景

为了优化用户体验,我们往往会在让用户输入手机号码时添加空格,比如:151 6558 1234.那么在iOS中如何实现呢?

实现方法

iOS中的输入框给UITextField添加UIControlEventEditingChanged事件 ,该方法实现输入框文字变动时的监听:textFieldDidEditing:

.DEMO

NSInteger i;//定义全局变量

• (void)viewDidLoad {
  [super viewDidLoad];
  // Do any additional setup after loading the view from its nib.
  i = 0;

  [self.textField addTarget:self action:@selector(textFieldDidEditing:) forControlEvents:UIControlEventEditingChanged];
  }
  -(void)textFieldDidEditing:(UITextField *)textField{
  if (textField == self.textField) {
  if (textField.text.length > i) {
  if (textField.text.length == 4 || textField.text.length == 9 ) {//输入
  NSMutableString * str = [[NSMutableString alloc ] initWithString:textField.text];
  [str insertString:@" " atIndex:(textField.text.length-1)];
  textField.text = str;
  }if (textField.text.length >= 13 ) {//输入完成
  textField.text = [textField.text substringToIndex:13];
  [textField resignFirstResponder];
  }
  i = textField.text.length;

    }else if (textField.text.length < i){//删除
        if (textField.text.length == 4 || textField.text.length == 9) {
            textField.text = [NSString stringWithFormat:@"%@",textField.text];
            textField.text = [textField.text substringToIndex:(textField.text.length-1)];
        }
        i = textField.text.length;
    }
  

  }
  }

ok,上面demo便可实现实现输入手机号时自动添加空格,

//备注:当到第四位或第九位时,如果此时是正在输入,则自动增加空格,如果正在删除,则自动删除空格!!!

//当到第13位时,截取前面的13位字符串,收起键盘

//若想要获取输入的手机,需要先删除空格; NSString *textFieldStr =[self.textField.text stringByReplacingOccurrencesOfString:@" "withString:@""];

方法二:

UITextField格式化电话号码和银行卡
//最近又发现了个新的方法也还不错哦

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {

NSString *text = [textField text];

NSCharacterSet *characterSet = [NSCharacterSet characterSetWithCharactersInString:@"0123456789\b"];

string = [string stringByReplacingOccurrencesOfString:@" " withString:@""];

if ([string rangeOfCharacterFromSet:[characterSet invertedSet]].location != NSNotFound) {

    return NO;

}



text = [text stringByReplacingCharactersInRange:range withString:string];

text = [text stringByReplacingOccurrencesOfString:@" " withString:@""];

// 如果是电话号码格式化，需要添加这三行代码

NSMutableString *temString = [NSMutableString stringWithString:text];

[temString insertString:@" " atIndex:0];

text = temString;

NSString *newString = @"";

while (text.length > 0) {

    NSString *subString = [text substringToIndex:MIN(text.length, 4)];

    newString = [newString stringByAppendingString:subString];

    if (subString.length == 4) {

        newString = [newString stringByAppendingString:@" "];

    }

    text = [text substringFromIndex:MIN(text.length, 4)];

}



newString = [newString stringByTrimmingCharactersInSet:[characterSet invertedSet]];



if (newString.length >= 14) {

    return NO;

}

[textField setText:newString];

return NO;

}

这段代码是极好的：不但一个个输入字符时没有问题，而且可以实现，复制粘贴过来后再实现格式化

作者：南山锄头
来源：CSDN
原文链接：https://blog.csdn.net/baidu_25743639/article/details/53541167