I want when user call app from background to reaload one function from viewcontroller?
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use some flag value in NSUserdefault when in background mode and check if value set true then called and after call again set the flag to false hope make sense!! – Sanjeet Verma Sep 27 '16 at 08:50
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if call from viewcontroller from background the function who calls again is viewdidload() ? – chris antonopoulos Sep 27 '16 at 09:09
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If anyone is looking for solution for swift 3 go here: https://stackoverflow.com/a/34529572/6595705 – stream28 Jun 23 '17 at 11:03
2 Answers
9
Elaborating on nishith's answer:
Add the following code to your view controller you want to refresh
override func viewWillAppear() {
super.viewWillAppear()
......
......
NotificationCenter.default.addObserver(self, selector:#selector(YourViewController.methodToRefresh), name: UIApplication.willEnterForegroundNotification, object: UIApplication.shared)
......
......
}
Always remember to cleanup when the view disappears in:
override func viewWillDisappear(animated: Bool) {
NotificationCenter.default.removeObserver(self)
}
Abhishek Arora
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You can register your controller for these notifications and reload your controller accordingly.
UIApplicationDidEnterBackgroundNotification
UIApplicationWillEnterForegroundNotification
nishith Singh
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At AppDelage i had this functions and i had enable backgroud modes. – chris antonopoulos Sep 27 '16 at 09:15
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If you have implemented your functionality in those methods then, what problem are you facing exactly? – nishith Singh Sep 27 '16 at 09:18
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sry this functions is in AppDelegate not at viewcontroller. This function observes the state of application inside the controller? – chris antonopoulos Sep 27 '16 at 09:20
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So you can register for these notifications in the viewDidLoad of your UIViewController and then you can handle these events in your UIViewController also – nishith Singh Sep 27 '16 at 09:22
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