A new collapse delegate was added in Xcode 12 and iOS 14. Unfortunately the Master-Detail template was removed so there has never been a good example of how to use it to maintain the behavior of the previous template which was to show the master if no detail is showing. Read more…
I needed to show an alert in an async context and this is how I achieved it: The idea to throw a cancellation exception was inspired by DDDevicePickerViewController which is the only built-in async UIViewController I’m aware of.
The documentation for UISplitViewControllerDelegate collapseSecondaryViewController says: When you return NO, the split view controller calls the collapseSecondaryViewController:forSplitViewController: method of the primary view controller, giving it a chance to do something with the secondary view controller’s content. Most view controllers do nothing by default but the UINavigationControllerclass responds by pushing the secondary view controller onto its navigation stack. Read more…