viewwillappear
What similar functionality method (viewWillAppear) exists on UIView?
How about the following from the UIView reference willMoveToSuperview:, didMoveToSuperview – Implement these methods as needed to track the movement of the current view in your view hierarchy. this will at least tell you when it is added to a view hierarchy but there is no guarantee that the view hierarchy is presented/viewable.
viewWillAppear, viewDidAppear not being called, not firing
I’m going to go ahead and disagree with @St3fan, and use UIKit as the counter-example. However, the wisdom (or lack thereof), of embedding controllers in general should be guided by sane UI design principles. The easiest counter-example is UINavigationControllers embedded in UITabBarControllers. These appear all over the place. Just off the top of my head, … Read more
Swift viewWillAppear not being called after dismissing view controller
You need to set the correct presentationStyle. If you want that your presentedController will be fullScreen and call it the previous viewWillAppear, then you can use “.fullScreen” let viewController = self.storyboard?.instantiateViewController(withIdentifier: “LoginController”) as! LoginController let navigationController: UINavigationController = UINavigationController(rootViewController: viewController) navigationController.modalPresentationStyle = .fullScreen present(navigationController, animated: true, completion: nil)
UIViewController viewDidLoad vs. viewWillAppear: What is the proper division of labor?
viewDidLoad is things you have to do once. viewWillAppear gets called every time the view appears. You should do things that you only have to do once in viewDidLoad – like setting your UILabel texts. However, you may want to modify a specific part of the view every time the user gets to view it, … Read more
Why does viewWillAppear not get called when an app comes back from the background?
Swift Short answer Use a NotificationCenter observer rather than viewWillAppear. override func viewDidLoad() { super.viewDidLoad() // set observer for UIApplication.willEnterForegroundNotification NotificationCenter.default.addObserver(self, selector: #selector(willEnterForeground), name: UIApplication.willEnterForegroundNotification, object: nil) } // my selector that was defined above @objc func willEnterForeground() { // do stuff } Long answer To find out when an app comes back from the … Read more