我的解决方案如下，适用于iOS 15

let window = (UIApplication.shared.connectedScenes.first as? UIWindowScene)?.windows.first

我的解决方案如下，适用于iOS 15

let window = (UIApplication.shared.connectedScenes.first as? UIWindowScene)?.windows.first

如果你想在任何ViewController中使用它，那么你可以简单地使用。

self.view.window

我已经解决了:

let scenes = UIApplication.shared.connectedScenes
let windowScene = scenes.first as? UIWindowScene
let window = windowScene?.windows.first

NSSet *connectedScenes = [UIApplication sharedApplication].connectedScenes;
for (UIScene *scene in connectedScenes) {
    if (scene.activationState == UISceneActivationStateForegroundActive && [scene isKindOfClass:[UIWindowScene class]]) {
        UIWindowScene *windowScene = (UIWindowScene *)scene;
        for (UIWindow *window in windowScene.windows) {
            UIViewController *viewController = window.rootViewController;
            // Get the instance of your view controller
            if ([viewController isKindOfClass:[YOUR_VIEW_CONTROLLER class]]) {
                // Your code here...
                break;
            }
        }
    }
}

支持iOS 13及以上版本。

为了继续使用与旧iOS版本相似的语法，UIApplication.shared.keyWindow创建以下扩展:

extension UIApplication {
    var mainKeyWindow: UIWindow? {
        get {
            if #available(iOS 13, *) {
                return connectedScenes
                    .flatMap { ($0 as? UIWindowScene)?.windows ?? [] }
                    .first { $0.isKeyWindow }
            } else {
                return keyWindow
            }
        }
    }
}

使用

if let keyWindow = UIApplication.shared.mainKeyWindow {
    // Do Stuff
}