UIInputViewController在離開並返回到視圖控制器後被解僱

Question

我正嘗試創建一個自定義聊天工具欄以顯示帶有消息的文本視圖以及允許照片選擇的按鈕。我今天早上重新編寫了代碼，非常仔細地遵循this WWDC 2017 talk on text input。工具欄本身是一個UIInputViewController，它使用自定義視圖來定義它的inputView。當我選擇一個按鈕時，我提出了一個UIImagePickerController，它工作正常。當我選擇圖像並返回到對話屏幕時，會出現問題...此時我再次與工具欄進行交互時，它會在觸摸時消失。這是正確的，如果是從屏幕上消失前的堆棧跟蹤：

#0 0x000000010d3b91fa in ConvoViewController.textViewDidEndEditing(UITextView) ->() at /Users/Joel/Documents/Software Projects/AtMe/AtMe/ConvoViewController.swift:480 
#1 0x000000010d3b93ca in @objc ConvoViewController.textViewDidEndEditing(UITextView) ->()() 
#2 0x000000010f4b88b8 in -[UITextView resignFirstResponder]() 
#3 0x000000010ea9cc74 in -[UIView(Hierarchy) _removeFirstResponderFromSubtree]() 
#4 0x000000010ea9d2eb in __UIViewWillBeRemovedFromSuperview() 
#5 0x000000010ea9d09e in -[UIView(Hierarchy) removeFromSuperview]() 
#6 0x000000010f45cf5c in __55-[UIInputWindowController invalidateInputAccessoryView]_block_invoke() 
#7 0x000000010ec069a5 in -[UIResponder _preserveResponderOverridesWhilePerforming:]() 
#8 0x000000010f45ced4 in -[UIInputWindowController invalidateInputAccessoryView]() 
#9 0x000000010f45d889 in -[UIInputWindowController changeToInputViewSet:]() 
#10 0x000000010f456675 in -[UIInputWindowController moveFromPlacement:toPlacement:starting:completion:]() 
#11 0x000000010f45e82f in -[UIInputWindowController setInputViewSet:]() 
#12 0x000000010f45614c in -[UIInputWindowController performOperations:withAnimationStyle:]() 
#13 0x000000010f0cca8a in -[UIPeripheralHost(UIKitInternal) setInputViews:animationStyle:]() 
#14 0x000000010ec0962d in -[UIResponder(UIResponderInputViewAdditions) reloadInputViews]() 
#15 0x000000010ec07ef1 in -[UIResponder _windowBecameKey]() 
#16 0x000000010ea6e9bb in -[UIWindow _makeKeyWindowIgnoringOldKeyWindow:]() 
#17 0x000000010ef33ab4 in -[UITextInteractionAssistant(UITextInteractionAssistant_Internal) setFirstResponderIfNecessary]() 
#18 0x000000010ef37178 in -[UITextInteractionAssistant(UITextInteractionAssistant_Internal) oneFingerTap:]() 
#19 0x000000010ef24f59 in -[UIGestureRecognizerTarget _sendActionWithGestureRecognizer:]() 
#20 0x000000010ef2cd57 in _UIGestureRecognizerSendTargetActions() 
#21 0x000000010ef2a70b in _UIGestureRecognizerSendActions() 
#22 0x000000010ef299ce in -[UIGestureRecognizer _updateGestureWithEvent:buttonEvent:]() 
#23 0x000000010ef16152 in _UIGestureEnvironmentUpdate() 
#24 0x000000010ef15c43 in -[UIGestureEnvironment _deliverEvent:toGestureRecognizers:usingBlock:]() 
#25 0x000000010ef14e0a in -[UIGestureEnvironment _updateGesturesForEvent:window:]() 
#26 0x000000010ea60eea in -[UIWindow sendEvent:]() 
#27 0x000000010ea0da84 in -[UIApplication sendEvent:]() 
#28 0x000000010f1f15d4 in __dispatchPreprocessedEventFromEventQueue() 
#29 0x000000010f1e9532 in __handleEventQueue() 
#30 0x0000000110d14c01 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__() 
#31 0x0000000110cfa0cf in __CFRunLoopDoSources0() 
#32 0x0000000110cf95ff in __CFRunLoopRun() 
#33 0x0000000110cf9016 in CFRunLoopRunSpecific() 
#34 0x00000001135fba24 in GSEventRunModal() 
#35 0x000000010e9f0134 in UIApplicationMain() 
#36 0x000000010d3ebed7 in main at /Users/Joel/Documents/Software Projects/AtMe/AtMe/AppDelegate.swift:15 
#37 0x000000011258065d in start() 
#38 0x000000011258065d in start() 

我得到了UIInputViewController以某種方式無效的感覺，但我不知道如何進行測試。有沒有人有任何想法？我花了好幾天的時間試圖讓這個工具欄免費工作，而且無論你如何處理它，似乎都是不可能的。

conversationViewController.swift

// MARK: - Input Accessory View (Controller) 
fileprivate let chatToolbarView: ChatToolbarView = { 
    let view = ChatToolbarView(frame: CGRect.zero, inputViewStyle: UIInputViewStyle.default) 

    // Add selectors as targets to the toolbar buttons 
    view.sendButton.addTarget(self, action: #selector(didPressSend(sender:)), for: UIControlEvents.touchUpInside) 
    view.libraryButton.addTarget(self, action: #selector(didPressLibraryIcon(sender:)), for: UIControlEvents.touchUpInside) 
    view.cameraButton.addTarget(self, action: #selector(didPressCameraIcon(sender:)), for: UIControlEvents.touchUpInside) 

    return view 
}() 

// Wrapper view controller for the custom input accessory view 
fileprivate let chatToolbarViewController = UIInputViewController() 

override var inputAccessoryViewController: UIInputViewController? { 
    // Ensure our input accessory view controller has it's input view set 
    chatToolbarViewController.inputView = chatToolbarView 

    // Return our custom input accessory view controller. You could also just return a UIView with 
    // override func inputAccessoryView() 
    return chatToolbarViewController 
} 


/** Action method which fires when the user taps the camera icon. */ 
@objc func didPressCameraIcon(sender: Any) { 

    photoPickerDisplayed = true 

    // Create picker, and set this controller as delegate 
    let picker = UIImagePickerController() 
    picker.delegate = self 
    picker.allowsEditing = true 
    picker.sourceType = UIImagePickerControllerSourceType.camera 

    DispatchQueue.main.async { 
     self.present(picker, animated: true, completion: nil) 
    } 
} 

override var canBecomeFirstResponder: Bool { return true } 

Answer 1

在你viewDidAppear

yourTextView.becomeFirstResponder() 

這將觸發您的自定義inputView再次打開。

希望這會有所幫助！

Answer 2

我最終通過將自定義工具欄視圖分配給視圖控制器的inputAccessoryView來解決問題，而不是將其分配給視圖控制器的inputAccessoryViewController的inputView屬性。

最大的問題是，在原始代碼中，模態呈現的任何視圖控制器（例如UIImagePickerViewController）都會混淆inputAccessoryViewController，並且在返回到原始控制器時將被完全拋棄。無論如何，使用控制器似乎是不必要的，它更多的是直接鍵盤定製而不是配件。

現在，該代碼如下所示：

fileprivate let chatToolbarView: ChatToolbarView = { 
    let view = ChatToolbarView(frame: CGRect.zero, inputViewStyle: UIInputViewStyle.default) 

    // Add selectors as targets to the toolbar buttons 
    view.sendButton.addTarget(self, action: #selector(didPressSend(sender:)), for: UIControlEvents.touchUpInside) 
    view.libraryButton.addTarget(self, action: #selector(didPressLibraryIcon(sender:)), for: UIControlEvents.touchUpInside) 
    view.cameraButton.addTarget(self, action: #selector(didPressCameraIcon(sender:)), for: UIControlEvents.touchUpInside) 

    return view 
}() 


/** Provide the view controller's inputAccessoryView object. */ 
override var inputAccessoryView: UIView? { return chatToolbarView } 


/** Give the view controller permission to become first responder. */ 
override var canBecomeFirstResponder: Bool { return true }