viewwillappear

Navigationbar coloring in ViewWillAppear happens too late in iOS 10

由 ╄→гoц情女王★ 提交于 2019-11-28 05:57:05
I am facing a weird bug, that happens only on iOS 10. I have a application with several screens, and each screen colors the navigationBar in viewWillAppear . So when you go to the next screen, it will be properly colored. However, when testing on iOS 10 I suddenly see the following behaviour when going back to a previous screen: When the previous screen appears the navigationBar still has the color of the previous screen and then flashes to the proper color. It almost looks like viewWillAppear somehow behaves as viewDidAppear . Relevant code: ViewController: - (void)viewWillAppear:(BOOL

viewWillAppear, viewDidAppear not being called, not firing

由 会有一股神秘感。 提交于 2019-11-27 19:37:15
(This is both question and answer since it took quite a bit of digging to find the real answer.) Symptom: viewWillAppear , viewDidAppear were not being called in my UIViewController. Cause: Embedding a UINavigationController or UITabBarController (my case) in a UIViewController somehow interrupts with the calling of these methods. Solution: Call them manually in the UIViewController that contains the aforementioned UINavigationController / UITabBarController . For example (assuming projectNavigationController is your UINavigationController ): -(void)viewWillAppear:(BOOL)animated { [super

react-navigation: Detect when screen, tabbar is activated / appear / focus / blur

由 一曲冷凌霜 提交于 2019-11-27 14:24:30
问题 Perviously when I wanted to make some actions when screen is opened I put them inside componentDidMount. For example I can fetch some data. like this. componentDidMount() { this.updateData(); } But with react-navigation componentDidMount occurs only one time when user open screen first time, and if later user open this page again it will not trigger componentDidMount. What is proper way to detect when page(screen) is activated and do actions? 回答1: With react-navigation , you can do that.

Guidelines for viewWillAppear, viewDidAppear, viewWillDisappear, viewDidDisappear

由 孤街浪徒 提交于 2019-11-27 11:15:35
问题 Are there any guidelines for using these methods in the right manner? In particular, I would like to know what type of code I could use inside them. For example, if I have to call a method that retrieves data from a WS, where do I have to call it? Where can I register/unregister a NSNotification? etc. 回答1: From UIViewController viewWillAppear: This method is called before the receiver’s view is about to be displayed onscreen and before any animations are configured for showing the view. You

viewWillAppear, viewDidAppear not being called, not firing

由 ☆樱花仙子☆ 提交于 2019-11-27 04:23:08
问题 (This is both question and answer since it took quite a bit of digging to find the real answer.) Symptom: viewWillAppear , viewDidAppear were not being called in my UIViewController. Cause: Embedding a UINavigationController or UITabBarController (my case) in a UIViewController somehow interrupts with the calling of these methods. Solution: Call them manually in the UIViewController that contains the aforementioned UINavigationController / UITabBarController . For example (assuming

About viewController's “viewDidLoad” and “viewWillAppear” methods

由 南楼画角 提交于 2019-11-27 01:59:59
问题 I've got a question regarding the two mentioned methods, since in my tests I don´t make clear the order they are called. I thought that, firstly, viewDidLoad is called when the viewController is loaded for first time (as the name indicates), and inmediately after the init method. Then, I thought that once viewDidLoad returns, viewWillAppear is called. If you display another viewController, and then you return to this one, then it should be already loaded and only viewWillAppear will be called

UIViewController viewDidLoad vs. viewWillAppear: What is the proper division of labor?

由 ☆樱花仙子☆ 提交于 2019-11-26 12:39:44
I have always been a bit unclear on the type of tasks that should be assigned to viewDidLoad vs. viewWillAppear : in a UIViewController subclass. e.g. I am doing an app where I have a UIViewController subclass hitting a server, getting data, feeding it to a view and then displaying that view. What are the pros and cons of doing this in viewDidLoad vs. viewWillAppear ? LeonBrussels 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

UIViewController viewDidLoad vs. viewWillAppear: What is the proper division of labor?

由 蓝咒 提交于 2019-11-26 03:02:22
问题 I have always been a bit unclear on the type of tasks that should be assigned to viewDidLoad vs. viewWillAppear : in a UIViewController subclass. e.g. I am doing an app where I have a UIViewController subclass hitting a server, getting data, feeding it to a view and then displaying that view. What are the pros and cons of doing this in viewDidLoad vs. viewWillAppear ? 回答1: viewDidLoad is things you have to do once. viewWillAppear gets called every time the view appears. You should do things

Why does viewWillAppear not get called when an app comes back from the background?

由 可紊 提交于 2019-11-26 02:41:31
I'm writing an app and I need to change the view if the user is looking at the app while talking on the phone. I've implemented the following method: - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; NSLog(@"viewWillAppear:"); _sv.frame = CGRectMake(0.0, 0.0, 320.0, self.view.bounds.size.height); } But it's not being called when the app returns to the foreground. I know that I can implement: [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(statusBarFrameChanged:) name:UIApplicationDidChangeStatusBarFrameNotification object:nil]; but I don't want
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