ios - didFinishLaunching中的UIApplicationShortcutItem

根据Apple文档:

您有责任确保系统有条件地调用此方法，具体取决于您是否启动了一个应用
方法(应用程序:willFinishLaunchingWithOptions:或
application:didFinishLaunchingWithOptions :)已经处理了
快速动作调用。系统调用启动方法(之前
调用此方法)，当用户为您的应用选择快速操作时
然后您的应用会启动而不是启动。要求的快速
动作可能使用与其他方式不同的代码路径
应用启动时。例如，假设您的应用正常启动到
显示视图A，但您的应用是为快速响应而启动的
需要视图B的操作。要处理此类情况，请在启动时进行检查，
您的应用是否通过快速操作启动。执行这个
签入您的应用程序:willFinishLaunchingWithOptions:或
application:didFinishLaunchingWithOptions:方法，方法是检查
UIApplicationLaunchOptionsShortcutItemKey启动选项键。的
UIApplicationShortcutItem对象可以用作
启动选项键。

但是，为什么需要在didfinishlauncing / willfinishLauncing方法中处理此问题。如果应用程序处于终止状态，则最终它将调用performActionForShortcutItem方法，那么为什么需要签入didfinish方法？

样例代码:

//code




    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        var launchedFromShortCut = false
        //Check for ShortCutItem
        if let shortcutItem = launchOptions?[UIApplicationLaunchOptionsShortcutItemKey] as? UIApplicationShortcutItem {
            launchedFromShortCut = true
            handleShortCutItem(shortcutItem)
        }

        //Return false incase application was lanched from shorcut to prevent
        //application(_:performActionForShortcutItem:completionHandler:) from being called
        return !launchedFromShortCut
    }

    func application(application: UIApplication, performActionForShortcutItem shortcutItem: UIApplicationShortcutItem, completionHandler: Bool -> Void) {
        let handledShortCutItem = handleShortCutItem(shortcutItem)
        completionHandler(handledShortCutItem)
    }

    func handleShortCutItem(shortcutItem: UIApplicationShortcutItem) -> Bool {
        var handled = false
        //Get type string from shortcutItem
        if let shortcutType = ShortcutType.init(rawValue: shortcutItem.type) {
            //Get root navigation viewcontroller and its first controller
            let rootNavigationViewController = window!.rootViewController as? UINavigationController
            let rootViewController = rootNavigationViewController?.viewControllers.first as UIViewController?
            //Pop to root view controller so that approperiete segue can be performed
            rootNavigationViewController?.popToRootViewControllerAnimated(false)

            switch shortcutType {
            case .Torquiose:
                rootViewController?.performSegueWithIdentifier(toTurquoiseSeque, sender: nil)
                handled = true
            case.Red:
                rootViewController?.performSegueWithIdentifier(toRedSeque, sender: nil)
                handled = true
            }
        }
        return handled
    }
}

最佳答案

它使您可以灵活地决定-您可以在didFinishLaunching中“尽早”进行处理-返回FALSE将禁止稍后调用performActionForShortcutItem。或者，您可以在didFinishLaunching中返回TRUE，并且仍然会调用performActionForShortcutItem。

关于ios - didFinishLaunching中的UIApplicationShortcutItem，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/35083367/