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
