Question

我有一个注册视图控制器，它包含多个文本字段来注册用户。我需要验证所有文字字段，例如非空，有效电子邮件，用户名，密码等。显示所有不同情况的警报消息。

现在我遵循以下方法：

if (condition) {
    if (condition) {
        if (condition) {
        } else {
            [alert show];
        }
    } else {
        [alert show];
    }
} else {
    [alert show];
}

我知道这不是最好的方法。所以大家请建议一个合适的方法来完成这项任务。

谢谢，

Answer 1

多个If else条件

NSString *emailRegEx = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegEx];

NSString *mobileRegex = @"[0-9]{6,14}$";
NSPredicate *mobileTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", mobileRegex]


if  (txtName.text.length == 0)
{
    [[[UIAlertView alloc]initWithTitle:@"Alert" message:@"Please Enter Name" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil] show];
}
else if  (txtMobile.text.length == 0)
{
    [[[UIAlertView alloc]initWithTitle:@"Alert" message:@"Please Enter Mobile Number" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil] show];
}
else if ([mobileTest evaluateWithObject:txtMobile.text] == NO)
{
    [[[UIAlertView alloc]initWithTitle:@"Alert" message:@"Please Enter valid Mobile Number" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil] show];
}
else if  (txtMobile.text.length < 10)
{
    [[[UIAlertView alloc]initWithTitle:@"Alert" message:@"Please Enter valid Phone Number" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil] show];
}
else if  (txtMobile.text.length > 10)
{
    [[[UIAlertView alloc]initWithTitle:@"Alert" message:@"Please Enter valid Phone Number" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil] show];
}
else if  (txtEmail.text.length == 0)
{
    [[[UIAlertView alloc]initWithTitle:@"Alert" message:@"Please Enter Email" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil] show];
}
else if ([emailTest evaluateWithObject:txtEmail.text] == NO)
{
    [[[UIAlertView alloc]initWithTitle:@"Alert" message:@"Please Enter valid Email" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil] show];
}
else
{
 //success Code
}

Answer 2

此处isAllFieldsAreValid()将验证您可以在此处添加所有验证的所有字段。

showAlert是一种显示错误提醒的方法。

allTrim()是一个可以修剪空格的宏。

- (BOOL)isAllFieldsAreValid {

    //here only empty string is checked you can add other if-else to validate email, phno, etc.

    if ([allTrim(self.txtFname.text) isEqualToString:@""]) {

        [self showAlert:@"Please enter first name."];
        return false;

    } else if ([allTrim(self.txtLname.text) isEqualToString:@""]) {

        [self showAlert:@"Please enter last name."];
        return false;

    } else if ([allTrim(self.txtEmail_SignUp.text) isEqualToString:@""]) {

        [self showAlert:@"Please enter email id."];
        return false;

    } else if ([allTrim(self.txtPassword_SignUp.text) isEqualToString:@""]) {

        [self showAlert:@"Please enter password."];
        return false;
    }

    return true;
}

你可以点击按钮调用它，然后根据真假你可以采取行动。

- (IBAction)buttonTappedInLoginView:(UIButton *)sender {

    if ([self isAllFieldsAreValid]) {
        // do stuff
    }

}

Answer 3

使用此代码，

if (firstnametf.text.length==0 || lastnametf.text.length==0 || emailtf.text.length==0 || myimageView.image == nil || commenttf.text.length==0 || [commenttf.text isEqualToString:@"Comment"])

            {
                [self validatetextfield];

            }
        else if (![emailtf.text isEqualToString:@""])
        {

             NSString *emailRegEx = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
             NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegEx];
                //Valid email address
             if ([emailTest evaluateWithObject:emailtf.text] == YES)
                {
                      //All conditions are checked, you will set the function
                }
                else if () 
                {
                    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Test!" message:@"Please Enter Valid Email Address. \nex. fdsjfkd@mail.com" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
                    [alert show];
                }

         }
}

方法：

-(void) validatetextfield
{
    if (firstnametf.text.length==0) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Firstname Field Empty!" message:@"Please Enter the Valid Details" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
        [firstnametf becomeFirstResponder];
    }
    else if (lastnametf.text.length==0)
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Lastname Field Empty!" message:@"Please Enter the Valid Details" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
        [lastnametf becomeFirstResponder];
    }
    else if (emailtf.text.length==0)
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Email Field Empty!" message:@"Please Enter the Valid Details" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
        [emailtf becomeFirstResponder];
    }
    else if(commenttf.text.length==0)
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Comment Field Empty!" message:@"Please Enter the Valid Details" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
        [commenttf becomeFirstResponder];
    }
    else if ([commenttf.text isEqualToString:@"Comment"])
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Comment Field Empty!" message:@"Please Enter the Valid Details" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
        [commenttf becomeFirstResponder];
    }
    else if (myimageView.image == nil)
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Image not Upload!" message:@"Please Upload Image" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];

    }
}

更改警报条件，希望其有用

ios中有多个if-else条件

3 个答案: