I'm wondering how would I be able to remove a view controller that the app is not currently on?
Let's say I segue from OldViewController to NewViewController. Once NewVC loads, how can I have it delete the OldVC, while the app is still on the NewVC?
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And what controller do you want to be shown instead of OldViewController?alexburtnik– alexburtnik2016-11-09 22:47:01 +00:00Commented Nov 9, 2016 at 22:47
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A -> B (presented modally over A) -> C (presented modally over B) and you want to return from C to A, right?alexburtnik– alexburtnik2016-11-09 22:48:29 +00:00Commented Nov 9, 2016 at 22:48
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I just edited the post to give an idea of the viewcontroller hierarchyEvanOgo– EvanOgo2016-11-09 22:49:07 +00:00Commented Nov 9, 2016 at 22:49
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Can you post your storyboard? How do you setup each segues?Munib– Munib2016-11-09 23:33:12 +00:00Commented Nov 9, 2016 at 23:33
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I think I'll just rephrase the question so its more straight forwardEvanOgo– EvanOgo2016-11-09 23:39:55 +00:00Commented Nov 9, 2016 at 23:39
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1 Answer
I've tried unwind segues and dismiss nested presentingViewController solutions, but both still have the issue with intermediate controller being visible during animation.
Then I found this suggestion which I modified with different snapshot generation, since it was not working properly for me.
Probably not the best solution, but still may be helpful.
Helper extensions:
extension UIViewController {
func dismissModalStack(animated: Bool, completion: (()->Void)?) {
guard let snapshot = UIApplication.shared.delegate?.window??.snapshotView() else { return }
self.presentedViewController?.view.insertSubview(snapshot, at: Int.max)
self.dismiss(animated: true, completion: completion)
}
}
extension UIView {
public func snapshotImage() -> UIImage? {
UIGraphicsBeginImageContextWithOptions(bounds.size, isOpaque, 0)
drawHierarchy(in: bounds, afterScreenUpdates: false)
let snapshotImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return snapshotImage
}
public func snapshotView() -> UIView? {
guard let snapshotImage = snapshotImage() else { return nil }
return UIImageView(image: snapshotImage)
}
}
Usage:
In the last presented view controller:
@IBAction func dismissPressed() {
self.presentingViewController?.presentingViewController?.dismissModalStack(animated: true, completion: nil)
}
Result:
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