[英]LibGDX displays black screen while app is paused but still visible (e.g. during in-app purchase password dialog) on iOS
[英]how can I make the uiviewcontroller visible only once during first run of the app (e.g. tutorial)?
在didFinishLaunchingWithOptions
方法AppDelegate
檢查NSUserDefaults
像這樣的價值。
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {
let defaults = NSUserDefaults.standardUserDefaults()
if defaults.objectForKey("isFirstTime") == nil {
defaults.setObject("No", forKey:"isFirstTime")
let storyboard = UIStoryboard(name: "main", bundle: nil) //Write your storyboard name
let viewController = storyboard.instantiateViewControllerWithIdentifier("ViewController") as! ViewController
self.window.rootViewController = viewController
self.window.makeKeyAndVisible()
}
return true
}
注意:我已經創建了ViewController
的對象,您需要在將它分配給rootViewController
之后創建 FirstPage 教程屏幕的對象。
對於 swift 4 進行這些更改。
let defaults = UserDefaults.standard
if defaults.object(forKey: "isFirstTime") == nil {
defaults.set("No", forKey:"isFirstTime")
defaults.synchronize()
...
}
此答案的簡化 Swift 4 版本。
https://stackoverflow.com/a/39353299/1565913
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {
if !UserDefaults.standard.bool(forKey: "didSee") {
UserDefaults.standard.set(true, forKey: "didSee")
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let viewController = storyboard.instantiateViewController(withIdentifier: "YourViewController")
self.window?.rootViewController = viewController
self.window?.makeKeyAndVisible()
}
return true
}
添加這是場景委托
func 場景(_ 場景:UIScene,willConnectTo 會話:UISceneSession,選項 connectionOptions:UIScene.ConnectionOptions){
guard let _ = (scene as? UIWindowScene) else { return }
if UserDefaults.standard.bool(forKey: "introLaunched") == false{
UserDefaults.standard.set(true, forKey: "introLaunched")
let storyboard = UIStoryboard(name: "Main", bundle: .main)
let vc = storyboard.instantiateViewController(identifier: "IntroScreenViewController") as! IntroScreenViewController
self.window?.rootViewController = UINavigationController(rootViewController: vc)
} else {
let storyboard = UIStoryboard(name: "Main", bundle: .main)
let vc = storyboard.instantiateViewController(withIdentifier: "ViewController") as! ViewController
self.window?.rootViewController = UINavigationController(rootViewController: vc)
}
}
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