push view when touchesBegan

Question

I have a apps with a navigation controller, when the user is in a specific view, He can touch a scollview and I want a push the rootViewController. So, I have subclasses uiscrollview, and in the method "touchesBegan", I want a push the rootviewcontroller, but I don't have access to the navigation controller! How I can do that?

thanks, Alex

Answer 1

UIViewControllers have a property "navigationController", so you just need to access the view controller of the view being touched.

However, I've found that in iphone development, jumping through hoops like that is a sign of weakness in development. For example, why should a view tell a view CONTROLLER to do something. It should be the other way around. That being said, UIViewController is a subclass of UIResponder, so you can handle touches in the controller. Then you can simply say.

[myViewController.navigationController pushViewController:animated:]

Answer 2

In your subclass of UIScrollView create two instanse variables:

id delegate;
SEL touchAction;

Then create methods:

-(void)setTarget:(id)target andAction:(SEL)action {
    delegate = target;
    touchAction = action;
}
-(void)callAction {
    if (delegate && [delegate respondsToSelector:touchAction]) {
        [delegate performSelector:touchAction];
    }
}

In your touchesBegan just call this mehtod:

...
[self callAction];
...

In your UIViewController class create method:

-(void)myScrollViewTouchAction {
    [self.navigationController pushViewController:myNewViewController animated:YES];
}

and finally when creating instance of your UIScrollView subclass, set it target and action:

[myScrollView setTarget:self andAction:@selector(myScrollViewTouchAction)];