UIInputViewController在离开并返回到视图控制器后被解雇

Question

我正尝试创建一个自定义聊天工具栏以显示带有消息的文本视图以及允许照片选择的按钮。我今天早上重新编写了代码，非常仔细地遵循this WWDC 2017 talk on text input。工具栏本身是一个UIInputViewController，它使用自定义视图来定义它的inputView。当我选择一个按钮时，我提出了一个UIImagePickerController，它工作正常。当我选择图像并返回到对话屏幕时，会出现问题...此时我再次与工具栏进行交互时，它会在触摸时消失。这是正确的，如果是从屏幕上消失前的堆栈跟踪：

#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以某种方式无效的感觉，但我不知道如何进行测试。有没有人有任何想法？我花了好几天的时间试图让这个工具栏免费工作，而且无论你如何处理它，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() 

这将触发您的自定义inputView再次打开。

希望这会有所帮助！

Answer 2

我最终通过将自定义工具栏视图分配给视图控制器的inputAccessoryView来解决问题，而不是将其分配给视图控制器的inputAccessoryViewController的inputView属性。

最大的问题是，在原始代码中，模态呈现的任何视图控制器（例如UIImagePickerViewController）都会混淆inputAccessoryViewController，并且在返回到原始控制器时将被完全抛弃。无论如何，使用控制器似乎是不必要的，它更多的是直接键盘定制而不是配件。

现在，该代码如下所示：

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 }