Question

我的应用中有一个UISplitViewController，我只想从屏幕左边缘滑动即可打开主视图面板。

presentsWithGesture添加swipe gesture，但可以从局部视图的任何位置添加。因此，我将其设置为false并实现了自定义UIScreenEdgePanGestureRecognizer，但是如果您连续滑动多次，它将崩溃。

这是我在appDelegate中的工作。

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

    let viewMaster = UIViewController()
    let viewDetail = MyFirstViewController()
    let navigationController = UINavigationController(rootViewController: viewDetail)

    let splitViewController = UISplitViewController()
    splitViewController.viewControllers = [viewMaster, navigationController]
    splitViewController.view.backgroundColor = .clear
    splitViewController.maximumPrimaryColumnWidth = 320
    splitViewController.preferredDisplayMode = .primaryHidden
    splitViewController.presentsWithGesture = false

    self.window = UIWindow(frame: UIScreen.main.bounds)
    self.window?.rootViewController = splitViewController
    self.window?.makeKeyAndVisible()

    return true
}

这是我的FirstViewController中的

class MyFirstViewController: UIViewController {
override func viewDidLoad() {
    self.view.backgroundColor = .red
    super.viewDidLoad()
}

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    swipeFromEdge()
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}

func swipeFromEdge() {
    let edgePan = UIScreenEdgePanGestureRecognizer(target: self, action: #selector(screenEdgeSwiped))
    edgePan.edges = .left
    self.view.addGestureRecognizer(edgePan)
}

@objc func screenEdgeSwiped(_ recognizer: UIScreenEdgePanGestureRecognizer) {
    if recognizer.state == .recognized {
        if let splitView = self.splitViewController {
            splitView.preferredDisplayMode = .primaryOverlay
        }
    }
}}

如果我连续多次快速滑动，应用程序将崩溃

2018-07-13 09：51：14.983707 + 0200 testGestureCrash [12126：1738716] *由于未捕获的异常'NSInvalidArgumentException'而终止应用程序，原因：'-[UIPopoverController _presentPopoverBySlidingIn：fromEdge：ofView：animated：stateOnly ：notifyDelegate：]：无法从没有窗口的视图中显示弹出窗口。 * 第一个调用堆栈：（0x18425ad8c 0x1834145ec 0x18425ac6c 0x18e8c442c 0x18e8c5868 0x18e8ca3b4 0x18e0466e8 0x18e5b33b4 0x18e1a8e38 0x18e045740 0x18e5a4bd4 0x18e03f4d8 0x18e03f010 0x18e03e874 0x18e03d1d0 0x18e81ed1c 0x18e8212c8 0x18e81a368 0x184203404 0x184202c2c 0x18420079c 0x184120da8 0x186105020 0x18e13d758 0x100fe0e6c 0x183bb1fc0） libc ++ abi.dylib：以类型为NSException的未捕获异常终止（lldb）

您是否知道错误来自何处？或者，也许您对我如何仅对UISplitViewController进行边缘滑动有一个更好的主意？

UISplitViewController崩溃的UIScreenEdgePanGestureRecognizer

0 个答案: