1.电话号码（带3-3-4效果）
- //指定代理
self.phoneTextField.delegate = self;
//当编辑改变的时候，进行字符校验
[self.phoneTextField addTarget:self action:@selector(reformatAsPhoneNumber:) forControlEvents:UIControlEventEditingChanged];#pragma mark - 手机号码分隔
/**
* 3-3-4手机号码分隔
*/
-(void)reformatAsPhoneNumber:(UITextField *)textField {
//判断正确的光标位置
NSUInteger targetCursorPostion = [textField offsetFromPosition:textField.beginningOfDocument toPosition:textField.selectedTextRange.start];
NSString *phoneNumberWithoutSpaces = [self removeNonDigits:textField.text andPreserveCursorPosition:&targetCursorPostion];
if([phoneNumberWithoutSpaces length] > 11) {
//避免超过11位的输入
[textField setText:_previousTextFieldContent];
textField.selectedTextRange = _previousSelection;
return;
} NSString *phoneNumberWithSpaces = [self insertSpacesEveryFourDigitsIntoString:phoneNumberWithoutSpaces andPreserveCursorPosition:&targetCursorPostion]; textField.text = phoneNumberWithSpaces;
UITextPosition *targetPostion = [textField positionFromPosition:textField.beginningOfDocument offset:targetCursorPostion];
[textField setSelectedTextRange:[textField textRangeFromPosition:targetPostion toPosition:targetPostion]];
} /**
* 除去非数字字符，确定光标正确位置
*
* @param string 当前的string
* @param cursorPosition 光标位置
*
* @return 处理过后的string
*/
- (NSString *)removeNonDigits:(NSString *)string andPreserveCursorPosition:(NSUInteger *)cursorPosition {
NSUInteger originalCursorPosition = *cursorPosition;
NSMutableString *digitsOnlyString = [NSMutableString new]; for (NSUInteger i=0; i<string.length; i++) {
unichar characterToAdd = [string characterAtIndex:i]; if(isdigit(characterToAdd)) {
NSString *stringToAdd = [NSString stringWithCharacters:&characterToAdd length:1];
[digitsOnlyString appendString:stringToAdd];
}
else {
if(i<originalCursorPosition) {
(*cursorPosition)--;
}
}
}
return digitsOnlyString;
} /**
* 将空格插入我们现在的string 中，并确定我们光标的正确位置，防止在空格中
*
* @param string 当前的string
* @param cursorPosition 光标位置
*
* @return 处理后有空格的string
*/
- (NSString *)insertSpacesEveryFourDigitsIntoString:(NSString *)string andPreserveCursorPosition:(NSUInteger *)cursorPosition{
NSMutableString *stringWithAddedSpaces = [NSMutableString new];
NSUInteger cursorPositionInSpacelessString = *cursorPosition; for (NSUInteger i=0; i<string.length; i++) {
if(i>0){
if(i==3 || i==7) {
[stringWithAddedSpaces appendString:@" "];
if(i<cursorPositionInSpacelessString) {
(*cursorPosition)++;
}
}
}
unichar characterToAdd = [string characterAtIndex:i];
NSString *stringToAdd = [NSString stringWithCharacters:&characterToAdd length:1];
[stringWithAddedSpaces appendString:stringToAdd];
}
return stringWithAddedSpaces;
} #pragma mark - UITextFieldDelegate -(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
_previousSelection = textField.selectedTextRange;
_previousTextFieldContent = textField.text;
if ( textField == self.phoneHMDTextField &&range.location >= 11){
return NO;
}else {
return YES;
}
}
二：监听代理方法（这样可以在if里通过判断，做几个textfield的限制输入）
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
if ( textField == self.phoneHMDTextField && range.location >= 11){
return NO;
}else {
return YES;
}
}
三：
//指定代理
self.phoneTextField.delegate = self;
//当编辑改变的时候，进行字符校验
[self.phoneTextField addTarget:self action:@selector(reformatAsPhoneNumber:) forControlEvents:UIControlEventEditingChanged];
//监听字符改变的方法
- (void)textFieldDidChange:(UITextField *)textField
{
if (textField == self.textFieldName) {
if (textField.text.length > 15) {
UITextRange *markedRange = [textField markedTextRange];
if (markedRange) {
return;
}
//Emoji占2个字符，如果是超出了半个Emoji，用15位置来截取会出现Emoji截为2半
//超出最大长度的那个字符序列(Emoji算一个字符序列)的range
NSRange range = [textField.text rangeOfComposedCharacterSequenceAtIndex:15];
textField.text = [textField.text substringToIndex:range.location];
}
}
}