Iphone – Passing a touch event to all subviews of a View Controller

argument-passingiphonesubview

I have a view controller which creates multiple subviews on top of it. All subviews and the view controller accept touches. How can i communicate the touch point information to all the subviews on the screen? Keep in mind that each subview covers the entire screen so after a few additions its a bit like pages in a book. That is, any subviews below the top subview can't be touched directly by the user. I have tried using [self.nextResponder touchesBegan:touches withEvent:event] however this only sends the touch information from the top subview to the superview bypassing all other subviews on the screen. Thanks

Best Answer

I would put another subview ontop of everything. This would grab all the touches that you were interested in and pass them back to the view controller. Your view controller would then iterate through all it's child UIViews, giving them the events.

i.e. something like

for (UIView *view in subviews)
  [view touchesBegan:touches withEvent:event];

though that's assuming that all the subviews you want to pass events to are children of your view controller.

Related Solutions

Objective-c – How to attach more than one controller to views its subviews

It is to do with the way you are structuring your application. For the BlueView1..6 to be handled by a separate view controller, it is that view controller which needs to create the view.

You need to create the view controllers for each blue view inside the main view controller, and then create each blue view inside the blue view inside each blue view controller.

Iphone – How to add an UIViewController’s view as subview

As of iOS 5, Apple now allows you to make custom containers for the purpose of adding a UIViewController to another UIViewController particularly via methods such as addChildViewController so it is indeed possible to nest UIViewControllers

EDIT: Including in-place summary so as to avoid link breakage

I quote:

iOS provides many standard containers to help you organize your apps. However, sometimes you need to create a custom workflow that doesn’t match that provided by any of the system containers. Perhaps in your vision, your app needs a specific organization of child view controllers with specialized navigation gestures or animation transitions between them. To do that, you implement a custom container - Tell me more...

...and:

When you design a container, you create explicit parent-child relationships between your container, the parent, and other view controllers, its children - Tell me more

Sample (courtesy of Apple docs) Adding another view controller’s view to the container’s view hierarchy

- (void) displayContentController: (UIViewController*) content
{
   [self addChildViewController:content];                 
   content.view.frame = [self frameForContentController]; 
   [self.view addSubview:self.currentClientView];
   [content didMoveToParentViewController:self];          
}

Best Answer

Related Solutions

Objective-c – How to attach more than one controller to views its subviews

Iphone – How to add an UIViewController’s view as subview

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