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