UIInputViewController在离开并返回查看控制器后被解雇

Question

我正在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，以及允许图片选择的按钮。今天早上，我重新编写了代码，以便非常密切地跟踪这是WWDC 2017关于文本输入的讨论。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，我会显示一个UIImagePickerController，它工作得很好。当我选择一个图像并返回到对话屏幕时，问题就会发生.此时，当我再次与工具栏交互时，它会在触摸时消失。下面是移除屏幕前的堆栈跟踪：

#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 ()

我觉得UIInputViewController在某种程度上是无效的，但我不知道如何测试它。有人有什么想法吗？我花了好几天的时间让这个工具栏没有bug，不管你怎么处理它，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

我最终解决了这个问题，将我的自定义工具栏视图分配给视图控制器的inputAccessoryView，，而不是将它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，任何视图控制器都可以正常地呈现(例如。( UIImagePickerViewController)混淆了inputAccessoryViewController，当返回到原始控制器时将被完全驳回。无论如何，使用控制器似乎是不必要的，它更适合直接定制键盘，而不是配件。

代码现在如下所示：

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 }

Answer 2

在你viewDidAppear上

yourTextView.becomeFirstResponder()

这将触发您的自定义inputView再次打开。

希望这能有所帮助！