#pragma mark - UITextFieldDelegate
- (BOOL)textField:(UITextField*)textFieldshouldChangeCharactersInRange:(NSRange)rangereplacementString:(NSString*)string {
if(textField == _cardTextField) {
// 四位加一个空格
if([stringisEqualToString:@""]) {// 删除字符
if((textField.text.length - 2) % 5 == 0) {
textField.text = [textField.textsubstringToIndex:textField.text.length -1];
}
returnYES;
}else{
if(textField.text.length % 5 == 0) {
textField.text = [NSStringstringWithFormat:@"%@ ", textField.text];
}
}
returnYES;
}
returnYES;
}
