ios - 检查 UITextfield 是否包含 (? ! $ 等)

Question

我正在执行一个条件语句来检查文本字段是否包含某些字符，如果包含，它们将显示 UIAlertView。目前，如果文本字段包含字母，则会显示警报，我将如何扩展下面的方法以包含诸如 ? ! , $ 等

if ([self.withdrawTextField.text rangeOfCharacterFromSet:[NSCharacterSet letterCharacterSet]].location != NSNotFound) {
        UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"Ooops" message:@"Please only use numbers and the period (.)." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];

}

Answer 1

试试这个:

NSMutableCharacterSet *mcs1 = [[NSCharacterSet letterCharacterSet] mutableCopy];
 [mcs1 addCharactersInString:@"?!.$"];

if ([self.withdrawTextField.text rangeOfCharacterFromSet:mcs1].location != NSNotFound) {
        UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"Ooops" message:@"Please only use numbers and the period (.)." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];

}