UIView removeFromSuperview is calling didMoveToSuperview

我不明白爲什麼UIView的removeFromSuperview正在調用didMoveToSuperview。UIView removeFromSuperview is calling didMoveToSuperview

我認爲didMoveToSuperview僅在視圖添加到視圖時纔會調用。任何人都可以解釋爲什麼removeFromSuperview調用didMoveToSuperview？

下面是我在做什麼在removeFromSuperview：

public override func removeFromSuperview() { 

    clearDelegates() 

    chaosPad?.removeFromSuperview() 
    brushSliders?.removeFromSuperview() 
    moodSlider?.removeFromSuperview() 
    brushShapeMenu?.removeFromSuperview() 
    moodMenu?.removeFromSuperview() 
    gravityMenu?.removeFromSuperview() 
    rotationMenu?.removeFromSuperview() 

    menuGroups = [] 
    centerButtons = [] 
    scrollMenuItems = [] 
    menu?.removeFromSuperview() 
    menu = nil 

    super.removeFromSuperview() 
} 

func clearDelegates() { 
    chaosPad?.delegate = nil 
    viewController = nil 
}

這裏是在didMoveToSuperview怎麼叫調用堆棧：

#0 0x0000000110f39708 in specialized _fatalErrorMessage(StaticString, StaticString, StaticString, UInt) ->()() 
#1 0x000000010b9cb960 in TDTOilistMenuPainting.configureFrames() ->() at /FastDev/TDTPhotoLib/Oilist/Classes/TDTOilistMenuPainting.swift:161 
#2 0x000000010b9cb83e in TDTOilistMenuPainting.didMoveToSuperview() ->() at /FastDev/TDTPhotoLib/Oilist/Classes/TDTOilistMenuPainting.swift:146 
#3 0x000000010b9cb872 in @objc TDTOilistMenuPainting.didMoveToSuperview() ->()() 
#4 0x000000010f5d1db5 in __45-[UIView(Hierarchy) _postMovedFromSuperview:]_block_invoke() 
#5 0x000000010dc87c60 in -[NSISEngine withBehaviors:performModifications:]() 
#6 0x000000010f5d19b1 in -[UIView(Hierarchy) _postMovedFromSuperview:]() 
#7 0x000000010f5cf610 in __UIViewWasRemovedFromSuperview() 
#8 0x000000010f5cf107 in -[UIView(Hierarchy) removeFromSuperview]() 
#9 0x000000010b9c9aba in TDTOilistMenuPainting.removeFromSuperview() ->() at /FastDev/TDTPhotoLib/Oilist/Classes/TDTOilistMenuPainting.swift:73 
#10 0x000000010ba6d269 in TDTPaintingViewController.(navigationController(UINavigationController, animationControllerForOperation : UINavigationControllerOperation, fromViewController : UIViewController, toViewController : UIViewController) -> UIViewControllerAnimatedTransitioning?).(closure #2) at /FastDev/TDTPhotoLib/Oilist/Classes/TDTPaintingViewController.swift:2706

來源

2016-11-14 Jeshua Lacock

你的意思是說：「我倒覺得'didMoveToSuperview'是隻有在視圖添加到視圖時才調用「？ – TylerTheCompiler

是的，謝謝，我編輯了這篇文章。 –

這是正常現象。 didMoveToSuperview在視圖的超級視圖發生更改時調用，即使它更改爲nil。您可以檢查，看看是否是上海華爲零或不是法裏面，以確定其是否加入或從它的父去除，如：

override func didMoveToSuperview() { 
    if let superview = self.superview { 
     // the view was added as a subview to superview 
    } 
    else { 
     // the view was removed from its superview 
    } 
}

來源

2016-11-14 01:49:20 TylerTheCompiler

感謝您的確認。我很驚訝它被稱爲。 –

是的，這是一個奇怪的方法，當然。我覺得蘋果應該把它命名爲「superviewDidChange」或類似的東西。 – TylerTheCompiler

我完全同意！ –

UIView removeFromSuperview is calling didMoveToSuperview

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