add a view on top of the keyboard using InputAccessoryView swift

问题

I'm trying to add a uiview to be on top of the keyboard always. I did it first with KeyboardWillShow/Hide, but it dosen't cover all cases and I'm trying to use inputAccesoryView. this is what I tried:

private var accessoryView = UIView(frame: CGRectZero)

class ViewController : UIViewController {

var myView: customUIView

override var inputAccessoryView: UIView {
    return accessoryView
}

override func canBecomeFirstResponder() -> Bool {
    return true
}

override func viewDidLoad() {
   super.viewDidLoad()
   accessoryView = myView
}
}

I get the following error :

Terminating app due to uncaught exception 'UIViewControllerHierarchyInconsistency', reason: 'child view controller:UICompatibilityInputViewController should have parent view controller:MyViewController but requested parent is: UIInputWindowController: '

any help will be appreciated!

回答1:

To get a view to stick above the keyboard, the code itself is pretty simple. The code you posted is not correct, try this (note that you must connect textField to the UITextField in your storyboard):

@IBOutlet weak var textField: UITextField!

override func viewDidLoad() {
    super.viewDidLoad()

    let customView = UIView(frame: CGRect(x: 0, y: 0, width: 10, height: 44))
    customView.backgroundColor = UIColor.red
    textField.inputAccessoryView = customView
}

回答2:

Details

• Xcode 11.2 (11B52), Swift 5

Solution

KeyboardToolbarButton

import UIKit

enum KeyboardToolbarButton: Int {

    case done = 0
    case cancel
    case back, backDisabled
    case forward, forwardDisabled

    func createButton(target: Any?, action: Selector?) -> UIBarButtonItem {
        var button: UIBarButtonItem!
        switch self {
            case .back: button = .init(title: "back", style: .plain, target: target, action: action)
            case .backDisabled:
                button = .init(title: "back", style: .plain, target: target, action: action)
                button.isEnabled = false
            case .forward: button = .init(title: "forward", style: .plain, target: target, action: action)
            case .forwardDisabled:
                button = .init(title: "forward", style: .plain, target: target, action: action)
                button.isEnabled = false
            case .done: button = .init(title: "done", style: .plain, target: target, action: action)
            case .cancel: button = .init(title: "cancel", style: .plain, target: target, action: action)
        }
        button.tag = rawValue
        return button
    }

    static func detectType(barButton: UIBarButtonItem) -> KeyboardToolbarButton? {
        return KeyboardToolbarButton(rawValue: barButton.tag)
    }
}

KeyboardToolbar

import UIKit

protocol KeyboardToolbarDelegate: class {
    func keyboardToolbar(button: UIBarButtonItem, type: KeyboardToolbarButton, isInputAccessoryViewOf textField: UITextField)
}

class KeyboardToolbar: UIToolbar {

    private weak var toolBarDelegate: KeyboardToolbarDelegate?
    private weak var textField: UITextField!

    init(for textField: UITextField, toolBarDelegate: KeyboardToolbarDelegate) {
        super.init(frame: .init(origin: .zero, size: CGSize(width: UIScreen.main.bounds.width, height: 44)))
        barStyle = .default
        isTranslucent = true
        self.textField = textField
        self.toolBarDelegate = toolBarDelegate
        textField.inputAccessoryView = self
    }

    func setup(leftButtons: [KeyboardToolbarButton], rightButtons: [KeyboardToolbarButton]) {
        let leftBarButtons = leftButtons.map {
            $0.createButton(target: self, action: #selector(buttonTapped))
        }
        let rightBarButtons = rightButtons.map {
            $0.createButton(target: self, action: #selector(buttonTapped(sender:)))
        }
        let spaceButton = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
        setItems(leftBarButtons + [spaceButton] + rightBarButtons, animated: false)
    }

    required init?(coder aDecoder: NSCoder) { super.init(coder: aDecoder) }
    @objc func buttonTapped(sender: UIBarButtonItem) {
        guard let type = KeyboardToolbarButton.detectType(barButton: sender) else { return }
        toolBarDelegate?.keyboardToolbar(button: sender, type: type, isInputAccessoryViewOf: textField)
    }
}

extension UITextField {
    func addKeyboardToolBar(leftButtons: [KeyboardToolbarButton],
                            rightButtons: [KeyboardToolbarButton],
                            toolBarDelegate: KeyboardToolbarDelegate) {
        let toolbar = KeyboardToolbar(for: self, toolBarDelegate: toolBarDelegate)
        toolbar.setup(leftButtons: leftButtons, rightButtons: rightButtons)
    }
}

Usage

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        textField.addKeyboardToolBar(leftButtons:  [.back, .forwardDisabled], rightButtons:  [.done], toolBarDelegate: self)
    }
}

extension ViewController: KeyboardToolbarDelegate {
   func keyboardToolbar(button: UIBarButtonItem, type: KeyboardToolbarButton, isInputAccessoryViewOf textField: UITextField) {
        print("Tapped button type: \(type) | \(textField)")
    }
}

Full example of usage

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        createTextField(frame: CGRect(x: 50, y: 50, width: 200, height: 40), leftButtons: [.backDisabled, .forward], rightButtons: [.cancel])
        createTextField(frame: CGRect(x: 50, y: 120, width: 200, height: 40), leftButtons: [.back, .forwardDisabled], rightButtons: [.done])
    }

    private func createTextField(frame: CGRect, leftButtons: [KeyboardToolbarButton] = [], rightButtons: [KeyboardToolbarButton] = []) {
        let textField = UITextField(frame: frame)
        textField.borderStyle = .roundedRect
        view.addSubview(textField)
        textField.addKeyboardToolBar(leftButtons: leftButtons, rightButtons: rightButtons, toolBarDelegate: self)
    }
}

extension ViewController: KeyboardToolbarDelegate {
   func keyboardToolbar(button: UIBarButtonItem, type: KeyboardToolbarButton, isInputAccessoryViewOf textField: UITextField) {
        print("Tapped button type: \(type) | \(textField)")
    }
}

Xcode 11.2 layout problem

• https://github.com/hackiftekhar/IQKeyboardManager/issues/1616

Results

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回答3:

Changes to make to your code:

• Give accessoryView a height
• Delete var myView: customUIView & the entire viewDidLoad() override

回答4:

Try this.

override var inputAccessoryView: UIView? {
    get {
       return containerView
    }
}
override var canBecomeFirstResponder: Bool {
   return true
}

来源：https://stackoverflow.com/questions/35689528/add-a-view-on-top-of-the-keyboard-using-inputaccessoryview-swift