Question

可能重复：
Ensure User has entered email address string in correct format?

我有UITextField我在其中输入用户输入的电子邮件地址，我想验证该电子邮件地址，例如我应该检查它是否包含@ sign和其他电子邮件字符等符号

如果电子邮件地址出错，则应显示UIAlertView，表示“输入有效的电子邮件地址”。

Answer 1

目标C风格

NSString *emailRegEx = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,10}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegEx];

if ([emailTest evaluateWithObject:email.text] == NO) {

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Test!" message:@"Please Enter Valid Email Address." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alert show];
    [alert release];

    return;
}

Swift Style

class func isValidEmail(emailString:String) -> Bool {

    let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,10}"
    var emailTest = NSPredicate(format:"SELF MATCHES %@", emailRegEx)

    let result = emailTest?.evaluateWithObject(emailString)
    return result!
}

Answer 2

您可以使用NSPredicate

执行此操作

//suppose emailID is your entered email address NSString
NSString *emailFormat1 = @"[A-Z0-9a-z._]+@[A-Za-z0-9]+\\.[A-Za-z]{2,4}";     


NSPredicate *emailTest1 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailFormat1]; 


if ([emailTest1 evaluateWithObject:emailID]||[emailTest2 evaluateWithObject:emailID]) {
   //yes it is valid
}
else
    //no it is invalid

Answer 3

将RegexKitLite添加到项目中并找到以下解决方案。

在iphone中验证UITextField中的电子邮件地址

3 个答案: