ios13以后的UIWindow的获取

    @objc public static func getCurrentWindow() -> UIWindow {
        if let window: UIWindow = (UIApplication.shared.delegate?.window)! {
            debugPrint(window)
            return window
        } else {
            if #available(iOS 13.0, *) {
                let arr: Set = UIApplication.shared.connectedScenes
                let windowScene: UIWindowScene = arr.first as! UIWindowScene
            //如果是普通APP开发，可以使用
            // SceneDelegate * delegate = (SceneDelegate *)windowScene.delegate;
               //UIWindow * mainWindow = delegate.window;
             if let mainWindow: UIWindow = windowScene.value(forKeyPath: "delegate.window") as? UIWindow {
                    return mainWindow
                } else {
                    return UIApplication.shared.windows.first!
                }
            }else{
                return UIApplication.shared.keyWindow!
            }
        }
    }


}

oc

+(UIWindow *)getCurrentWindow{
    
    if([[[UIApplication sharedApplication] delegate] window]){
        return [[[UIApplication sharedApplication] delegate] window];
    }else {
        if (@available(iOS 13.0,*)) {
            NSArray *arr = [[[UIApplication sharedApplication] connectedScenes] allObjects];
            UIWindowScene *windowScene =  (UIWindowScene *)arr[0];
            //如果是普通APP开发，可以使用
            //SceneDelegate *delegate = (SceneDelegate *)windowScene.delegate;
            //UIWindow *mainWindow = delegate.window;
            
            //  由于在sdk开发中，引入不了SceneDelegate的头文件，所以需要使用kvc获取宿主的app的window
            UIWindow *mainWindow = [windowScene valueForKeyPath:@"delegate.window"];
            if(mainWindow){
                return mainWindow;
            }else{
                return [UIApplication sharedApplication].windows.lastObject;
            }
        }else {
            return [UIApplication sharedApplication].keyWindow;
        }
        
    }
}