uiwindow

I'm creating a reusable framework for displaying notifications in an iOS application. I'd like the notification views to be added over the top of everything else in the application, sort of like a UIAlertView. When I init the manager that listens for NSNotification events and adds views in response, I need to get a reference to the top-most view in the application. This is what I have at the moment: _topView = [[[[UIApplication sharedApplication] keyWindow] subviews] lastObject]; Would this work for any iOS application or is their a safer/better way to get the top view? Usually that will give

When accessing UIapplication's main window it is returned as a UIWindow?? let view = UIApplication.sharedApplication().delegate?.window // view:UIWindow?? Why is it returning as a double optional and what does it mean and if put into a if let should I add one ! after it? if let view = UIApplication.sharedApplication().delegate?.window! My first though was to replace ? with a ! after delegate but that was not the solution. Rob Napier @matt has the details, but there is a (somewhat horrible, somewhat awesome) workaround. (See edit below, though) let window = app.delegate?.window??.`self`() I

I want to have a persistent button in the bottom right corner of my app. During all view transitions, the button should remain static. I'm having trouble deciding what view to add the button to. I know the button ought to be stored in the AppDelegate, but I don't know what other view it would be sense to add it to except the window. One downside of adding it to the window is that when there's an app running in the background (ie Phone), the added status bar padding will push down the window. In general, adding it to the window seems to be a hacky solution -- any thoughts? Yes, adding it to the

The position of a UIView can obviously be determined by view.center or view.frame etc. but this only returns the position of the UIView in relation to it's immediate superview. I need to determine the position of the UIView in the entire 320x480 co-ordinate system. For example, if the UIView is in a UITableViewCell it's position within the window could change dramatically irregardless of the superview. Any ideas if and how this is possible? Cheers :) That's an easy one: [aView convertPoint:localPosition toView:nil]; ... converts a point in local coordinate space to window coordinates. You can

I have a UIView which is supposed to cover the whole device (UIWindow) to support an image zoom in/out effect I'm doing using core animation where a user taps a button on a UITableViewCell and I zoom the associated image. The zooming is performing flawlessly, what I haven't been able to figure out is why the subview is still in portrait mode even though the device is in landscape. An illustration below: I do have a navigation controller but this view has been added to the UIWindow directly. dizy You can read about some of the possible causes here: Technical Q&A QA1688 - Why won't my

Recently I've been wondering about the fact that that an iOS app only has one UIWindow . It does not seem to be an issue to create another UIWindow and place it on screen. My question is kind of vague, but I'm interested in: What could I potentially achieve with a second UIWindow that cannot be done in other ways? What can go wrong when using multiple UIWindow instances? I have seen that people use a 2nd UIWindow to display popover like views on iPhone. Is this a good way of doing it? Why? Why not? Are there other examples where it is making perfectly sense to have another UIWindow ? It's not