swift - 从 Swift 4 中的 Popover Viewcontroller 实时更新 UIViewController

Question

现在我正在试验 SceneKit DebugOptions。 我正在尝试使用 Popover ViewController 中的开关 Controller 实时更新/显示 Scenekits 调试选项。

我尝试了很多东西，比如用户默认、委托(delegate)和协议(protocol)，但我仍然无法实时看到结果，每次我都必须终止应用程序并重新启动它才能看到结果。

所以，如果有人能回答我的问题，我将不胜感激:D

我添加到 MainVC 的扩展

extension ViewController: UIPopoverPresentationControllerDelegate, DebugOptions {

func wireFrameEnabled(enabled: Bool) {
    if enabled == true {
        print(enabled)
    }
}

func showCameraEnabled(enabled: Bool) {

}

func showAllDebugOptions(enabled: Bool) {

}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    guard let popoverController = segue.destination.popoverPresentationController, let button = sender as? UIButton else { return }
    popoverController.delegate = self
    popoverController.sourceRect = button.bounds
    let debugMenuVC = popoverController.presentedViewController as! DebugMenuVC
    debugMenuVC.delegate? = self
}

func adaptivePresentationStyle(for controller: UIPresentationController) -> UIModalPresentationStyle {
    return .none
}

}

协议(protocol)

protocol DebugOptions {
func wireFrameEnabled(enabled: Bool)
func showCameraEnabled(enabled: Bool)
func showAllDebugOptions(enabled: Bool)

}

调试菜单VC

class DebugMenuVC: UIViewController {
@IBOutlet weak var bgView: UIView!
@IBOutlet weak var showWireFrameSwitch: UISwitch!
@IBOutlet weak var showCameraSwitch: UISwitch!
@IBOutlet weak var showAllSwitch: UISwitch!

var delegate: DebugOptions?

override func viewWillLayoutSubviews() {
    preferredContentSize = CGSize(width: 150, height: 300)
}

override func viewDidLoad() {
    super.viewDidLoad()
    buttonCheck()
}

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)


}

@IBAction func aSwitchBtnWasPressed( _ sender: UISwitch ) {
    if (sender.tag == 0) && (sender.isOn == true) {
        userDefaults.set(true, forKey: SHOW_WIRE_FRAME)
        delegate?.wireFrameEnabled(enabled: true)


    } else if (sender.tag == 0) && (sender.isOn == false) {
        userDefaults.set(false, forKey: SHOW_WIRE_FRAME)
        delegate?.wireFrameEnabled(enabled: false)

    }

}

func buttonCheck() {
    if userDefaults.bool(forKey: SHOW_WIRE_FRAME) == true{
        showWireFrameSwitch.isOn = true
    } else {
        showWireFrameSwitch.isOn = false
    }

}

}

Answer 1

在 debubMenuVC.delegate 中不应是可选的。这就是委托(delegate)方法总是失败的原因:D

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    guard let popoverController = segue.destination.popoverPresentationController, let button = sender as? UIButton else { return }
    popoverController.delegate = self
    popoverController.sourceRect = button.bounds
    let debugMenuVC = popoverController.presentedViewController as! DebugMenuVC
    debugMenuVC.delegate? = self
}