Question

Similar to this question, but I am looking for a generic solution or design pattern or framework.

Q. How to add state management into all UI controls in my iOS app automatically without the need to rewrite the existing controls’ class?

Example:

e.g. When I click on a UIButton, it will create a new UIWebView showing Google home page. That is easy, but problem arise when user sometimes.. click the button just too fast, so two webview will be displayed.

To solve this question, I would need to make a singleton class which contain the webview, and have a state variable isOpended and if it is true, reuse the existing webview instead of creating a new one.

But the problem is: If I want this behavior in other controls also, then I would need to create many many singleton classes..I am just thinking if there is better way to handle this without the new to re-invent the wheel.

Thanks.

Answer 1

I think you’re solving the wrong problem here. Why don’t you disable the button until the UIWebView is done processing. That way the user cannot click it twice.

- (IBAction)showMapHomepage:(UIButton*)sender
{
    sender.enabled = NO;
    [self taskThatTakesALongTimeWithCompletion:^{
        sender.enabled = YES;
        // Finish processing
    }];
}