ios - shouldChangeCharactersInRange 没有被调用。？

Question

我有必须调用的方法来检查手机号码范围和其他格式。但这个方法没有被调用:(

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
    ProfileBasicCell *cell=[_tblView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]];
    if (cell.txtMobile.text== textField && string.length>0) {
        NSString *newText=[textField.text stringByReplacingCharactersInRange:range withString:string];
        if (newText.length<=15) {
            if (newText.length==4 || newText.length==8) {
               textField.text=[newText stringByAppendingString:@"-"];
               return NO;
             }
        return YES;
    } else {
        return NO;
    }  
   }
   return YES;
}

Answer 1

你设置了委托(delegate)吗？

class yourViewController: UITextFieldDelegate {

}

self.yourTextField.delegate = self;