iOS TextField验证

Question

我需要一种方法来确保电话号码有10位数而没有其他字符即() - 并确保电子邮件地址是有效的电子邮件(格式正确).

是否有任何库不能让我这么容易,所以我不必编写正则表达式.

Answer 1

这将检查UITextField以获取10位数或更少的正确电子邮件和电话号码.
将此方法添加到textFields 委托,然后检查是否应添加要更改的字符.
返回YES或NO取决于文本字段,当前包含的字符数以及要添加的字符数:

#define ALPHA                   @"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
#define NUMERIC                 @"1234567890"
#define ALPHA_NUMERIC           ALPHA NUMERIC

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    NSCharacterSet *unacceptedInput = nil;
    switch (textField.tag) {
        // Assuming EMAIL_TextField.tag == 1001
        case 1001:
            if ([[textField.text componentsSeparatedByString:@"@"] count] > 1)
                unacceptedInput = [[NSCharacterSet characterSetWithCharactersInString:[ALPHA_NUMERIC stringByAppendingString:@".-"]] invertedSet];
            else
                unacceptedInput = [[NSCharacterSet characterSetWithCharactersInString:[ALPHA_NUMERIC stringByAppendingString:@".!#$%&'*+-/=?^_`{|}~@"]] invertedSet];
            break;
        // Assuming PHONE_textField.tag == 1002
        case 1002:
            if (textField.text.length + string.length > 10) {
                return NO;
            }
            unacceptedInput = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];
            break;
        default:
            unacceptedInput = [[NSCharacterSet illegalCharacterSet] invertedSet];
            break;
    }
    return ([[string componentsSeparatedByCharactersInSet:unacceptedInput] count] <= 1);
}  

另外,请查看以下两篇文章:
在iPhone
PhoneNumberFormatter 上自动格式化电话号码UITextField.