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。

1. 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!!!
2. 当到第13位时,截取前面的13位字符串,收起键盘
3. 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