CVKHierarchySearcher is a small utility class to go through the view controller hierarchy of an iOS app
and retrieve often needed topmost view controllers. Right now it provides the topmost, topmost non-modal and
topmost UINavigationController.
Using it is very simple. Just instantiate the object whenever you need it and ask for a specified view controller:
CVKHierarchySearcher *hierarchy = [[CVKHierarchySearcher alloc] init];
UIViewController *topmost = hierarchy.topmostViewController;Class relies on -[UIApplicationDelegate window], and if that fails, uses -[UIApplication keyWindow].
This worked for me, but if this needs another fallback for some kinds of apps, let me know.
For mocking purposes, CVKHierarchySearcher implements a protocol ViewControllerHierarchy rather than just provides all the methods as is. For the same purpose methods are on instance, not class. While this makes a
drop-in usage a tiny bit more complicated, it allows much easier testing than having to deal with classes actually showing new controllers on top of whatever they want.
For a way to easily inject this object and utilise the interface-only approach, see CVKInjector.
iOS 7 and up. I'm using and testing this on iOS 7+, but if anyone can test and needs this on iOS 6, please submit a PR.
CVKHierarchySearcher is available through CocoaPods. To install it, simply add the following line to your Podfile:
pod 'CVKHierarchySearcher'
Romans Karpelcevs, karpelcev@gmail.com
CVKHierarchySearcher is available under the MIT license. See the LICENSE file for more info.