Question

在我的应用程序中，我想在主UIWindow上创建一个新的UIWindow，我编写如下，但它不起作用。首先，我创建一个UIWindow作为主窗口，然后使其成为键和可见，然后创建一个新的UIWindow叠加层，但没有任何反应。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.window.backgroundColor = [UIColor redColor];
    ViewController *vc = [[ViewController alloc]initWithNibName:@"ViewController" bundle:nil];
    self.window.rootViewController = vc;
    [self.window makeKeyAndVisible];
    UIWindow *window1 = [[UIWindow alloc] initWithFrame:CGRectMake(0, 0, 320, 320)];
    window1.backgroundColor = [UIColor redColor];
    window1.windowLevel = UIWindowLevelAlert;
    [window1 makeKeyAndVisible];
    return YES;
}

Answer 1

UIWindow *window1 = [[UIWindow alloc] initWithFrame:CGRectMake(0, 0, 320, 320)];
window1.backgroundColor = [UIColor redColor];
window1.windowLevel = UIWindowLevelAlert;
[window1 makeKeyAndVisible];

最后我知道为什么它不起作用，因为window1是一个方法var，它会在方法执行后丢失。所以我为它声明了一个新的@property，如

@property (strong, nonatomic) UIWindow *window2;

和改变代码，如

UIWindow *window2 = [[UIWindow alloc] initWithFrame:CGRectMake(0, 80, 320, 320)];
window2.backgroundColor = [UIColor redColor];
window2.windowLevel = UIWindowLevelAlert;
self.window2 = window2;
[window2 makeKeyAndVisible];

它有效！

Answer 2

Xcode 8 + Swift

class ViewController: UIViewController {
    var coveringWindow: UIWindow?

    func coverEverything() {
        coveringWindow = UIWindow(frame: (view.window?.frame)!)

        if let coveringWindow = coveringWindow {
            coveringWindow.windowLevel = UIWindowLevelAlert + 1
            coveringWindow.isHidden = false
        }
    }
}

根据the documentation，要接收没有相关坐标值的事件（例如键盘输入），请将其设为key，而不是仅! isHidden：< / p>

coveringWindow.makeKeyAndVisible()

您甚至可以控制其背景的透明度，以获得烟雾效果：

coveringWindow.backgroundColor = UIColor(white: 0, alpha: 0.5)

请注意，此类窗口需要处理方向更改。

Answer 3

您的window1对象是一个局部变量，当代码用完此方法时，该对象不再存在。我们创建的任何UIWindow对象都将添加到[[UIApplication sharedApplication] windows]，但此数组仅保留对任何UIWindow对象的一周引用，因此它可以由您自己的代码保留窗口对象存在。为什么苹果这样实现，我想，只要应用程序运行，[UIApplication sharedApplication]对象就存在，这样做是为了避免保留只需要存在一段时间的UIWindow个对象生活在记忆中＆＃34;永远＆＃34;。

还有什么，您的代码可以与MRC一起运行。

Answer 4

快捷键4

为避免内存泄漏，我更喜欢按照Apple的建议以这种方式初始化自定义窗口：

如果要为应用提供自定义窗口，则必须实现此属性的getter方法，并将其用于创建和返回自定义窗口。

示例：

var myCustomWindow: UIWindow? = CustomWindow(frame: UIScreen.main.bounds)

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

    let mainController: MainViewController = UIStoryboard(name: "Main", bundle: nil).instantiateInitialViewController() as! MainViewController
    self.myCustomWindow?.rootViewController = mainController
    self.myCustomWindow?.makeKeyAndVisible()
}

Answer 5

如果你使用的是窗口场景，试试这个：

private var overlayWindow: UIWindow!

if let currentWindowScene = UIApplication.shared.connectedScenes.first as?  UIWindowScene {
        overlayWindow = UIWindow(windowScene: currentWindowScene)
    }
overlayWindow.windowLevel = UIWindow.Level.alert
overlayWindow.rootViewController = UIViewController()//your controller or navController
overlayWindow.makeKeyAndVisible()

Answer 6

SWIFT 5

在 iOS13 及更高版本中，您必须使用 owner@owner-desktop:~/example$ java -jar samples/HelloFX/Maven/hellofx/target/hellofx-1.0-SNAPSHOT-jar-with-dependencies.jar --module-path ./javafx-jmods-11.0.2/ --add-modules=javafx.base,javafx.graphics,javafx.controls,javafx.fxml Error: JavaFX runtime components are missing, and are required to run this application owner@owner-desktop:~/example$ 初始值设定项创建 UIWindow，如下所示windowScene:。对于较低的 iOS 版本，您应该使用 let overlayWindow = UIWindow(windowScene: YourScene) 初始化程序，如下所示 frame:。

创建 let overlayWindow = UIWindow(frame: YourFrame) 实例后，您可以使用代码来显示窗口，如@Nick Greg 的回答：

<块引用>

UIWindow

Answer 7

尝试在mainWindow上添加UIView而不是另一个UIWindow ...

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.window.backgroundColor = [UIColor redColor];
    ViewController *vc = [[ViewController alloc]initWithNibName:@"ViewController" bundle:nil];
    self.window.rootViewController = vc;
    [self.window makeKeyAndVisible];
    UIView * viewAlert = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 320)];
    viewAlert.backgroundColor = [UIColor redColor];
    [self.window.rootViewController.view addSubView:viewAlert];
    /* or you can use following..
    [self.window addSubView:viewAlert];
    */
    [viewAlert release]; //FOR NON ARC
    return YES;
}

Answer 8

在swift中，可以按如下方式添加新的UIWindow ..

class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    var viewController: ViewController?
    var navigationController: UINavigationController?

    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
        self.viewController = ViewController(nibName: "ViewController", bundle:NSBundle.mainBundle())
        self.navigationController = UINavigationController(rootViewController: self.viewController!)
        self.window!.rootViewController = self.navigationController
        //  self.window!.addSubview(self.viewController!.view)
        self.window!.makeKeyAndVisible()
        return true
    }

    //Other methods..
}

Answer 9

如果您只需要在Swift 5中更改共享窗口ViewController

UIApplication.shared.keyWindow?.rootViewController = UINavigationController(rootViewController: yourViewController)

Answer 10

func createAdsWindow(){
    let frame = CGRect.init(0, UIScreen.main.bounds.height - 60, UIScreen.main.bounds.width, 60)
    adsWindow = UIWindow.init(frame: frame)
    adsWindow!.backgroundColor = UIColor(colorBackground)
    let adsViewController = UIViewController.init()
    adsViewController.view.backgroundColor = UIColor.red
    adsWindow?.rootViewController = adsViewController
    adsWindow?.windowLevel = UIWindow.Level(rawValue: 2)
    adsWindow?.makeKeyAndVisible()
}

在主窗口上创建新的UIWindow

10 个答案:

Xcode 8 + Swift