确保用户输入的电子邮件地址字符串格式正确吗？ [英] Ensure User has entered email address string in correct format?

问题描述

我在联系人屏幕中有一个文本字段，用户需要输入电子邮件地址来发送信息。
什么是确保用户输入有效电子邮件地址的最佳方式，如：

i have a text field in Contact screen and the user need to enter email address to send me message. Whats the best way to ensure the user has entered a valid email address such as:

[e-mail] / net / org / co.il
[e-mail]
[e-mail]

等..

谢谢

推荐答案

以下内容：

- (BOOL) validateEmail: (NSString *) candidate {
    NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
//  return 0;
    return [emailTest evaluateWithObject:candidate];
}


-(IBAction)btnTapped:(id)sender{

    if([self validateEmail:[txtEmail text]] ==1)
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Message" message:@"You Enter Correct Email id." delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
        [alert show];
        [alert release];

    }
    else{
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Message" message:@"You Enter Incoorect Email id." delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
        [alert show];
        [alert release];
    }
}

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