To handle the UIAlertView (or any others class) delegate in class method just have to change the minus - to plus +

Example

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+ (void)someMethod:(NSString *)title withMessage:(NSString *)message
{
    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:title
                                                   message:message
                                                  delegate:self // same here
                                         cancelButtonTitle:@"Cancel" 
                                         otherButtonTitles:@"Done", nil];
}

// change to PLUS
+ (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    NSLog(@"Button %d selected", buttonIndex);
}

There is no need to conform to UIAlertViewDelegate protocol, without the statement below will also work.

e.g.

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@interface ViewController : UIViewController <UIAlertViewDelegate>

Reference: Can I use a class method as a delegate callback