Serious bug on iPad Pro 9.7 inch. After the app back from background, the date label will duplicate and dislocated

[akring]

The following informations are requested in a bug report

• A brief bug description.

This can even be produced by the demo you supported

• Stack trace.

not yet

• Full steps to reproduce.

Here is the GIF GIF link: http://7bv8xb.com1.z0.glb.clouddn.com/FSCalendar%20Bug.gif

• Device modal and iOS version. e.g. iPhone 6s iOS9.1

Xcode 8 / iOS 10 / iPad Pro 9.7 inch (It works well on iPad Pro 12.9 inch)

• FSCalendar version. e.g. FSCalenda 2.5.1

FSCalendar 2.7.9 via Cocoapods

• Does this happen in the demo project? Which one? Or a link to another demo project.

Yes, FSCalendarSwiftExample

[mureatencio]

Did you find any solution?

[redcapua]

Try to set "UIRequiresFullScreen" in project settings. iPad supports split screen option, it seems some screen update happens after application changes state.

[mureatencio]

Yeah, possibly there is a screen update, but my app should support split screen. Any other idea?

[tschmitz]

I found that observing UIApplicationWillEnterForegroundNotification and then calling invalidateLayout() on the calendar view's collectionViewLayout property seemed to fix the problem. For example:

var calendarView: FSCalendar!

override func viewDidLoad() {
    super.viewDidLoad()
    NotificationCenter.default.addObserver(self, selector: #selector(restoreFromBackground), name: UIApplication.willEnterForegroundNotification, object: nil)
}

@objc func restoreFromBackground() {
    calendarView.collectionViewLayout.invalidateLayout()
}

[twilightDD]

Note: Setting UIRequiresFullScreen = YES resolves #1057 too.

[twilightDD]

An other approach to keep UIRequiresFullScreen = NO may be a combination of @tschmitz suggestion (that did not work for me) and a hack to resolve a rotation problem:

override func viewDidLoad() {
    super.viewDidLoad()
    NotificationCenter.default.addObserver(self, selector: #selector(restoreFromBackground), name: UIApplication.willEnterForegroundNotification, object: nil)
}

@objc func restoreFromBackground() {
   calendarView.scrollDirection = .vertical
   calendarView.scrollDirection = .horizontal
}