设备方向更改时 UIWindow 不旋转

Question

我的项目有一个功能，我已将我的应用程序与投影仪等外部显示器连接起来。我的应用程序在两个方向上工作。我的应用程序中有 2 个窗口。 window1 是我们的默认窗口。我创建了window2，他的名字是external window。我已经创建了外部窗口，因为我不想在投影仪上显示我的整个应用程序，所以我只是在 window2 上添加了视图控制器，然后在外部显示器（投影仪）上显示 window2。

现在的问题是，当我更改应用程序的方向时，它工作正常，但 window2 不旋转。 Window2 始终以横向模式显示。我只想将window2的方向设置为与window1相同。我已经尝试了很多，但找不到任何解决方案。

请检查我的代码。我添加了如何将应用程序与外部显示器连接的代码。如果我做错了什么，请检查并帮助我。

AppDelegate.m

 -(void)initExternalWindow
    {
        //Setup external screen window
        (AppObj).externalWindow = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen] bounds]];
        UIStoryboard *sb = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
        (AppObj).externalScreen = [sb instantiateViewControllerWithIdentifier:@"ExternalVC"];
        UINavigationController *navController=[[UINavigationController alloc] initWithRootViewController:(AppObj).externalScreen];

        navController.navigationBarHidden=YES;
        (AppObj).externalWindow.opaque = NO;

        (AppObj).externalWindow.rootViewController = navController;

        (AppObj).externalWindow.backgroundColor = view_bg_color;
        (AppObj).externalWindow.hidden = NO;
        (AppObj).externalWindow.opaque = NO;
        [(AppObj).externalWindow makeKeyAndVisible];
    }

ViewController.m

- (void)viewDidLoad {
     [self setupScreenConnectionNotificationHandlers];
 }
#pragma mark- External dispaly detections (Add Notifications)
- (void)setupScreenConnectionNotificationHandlers
{
    NSNotificationCenter* center = [NSNotificationCenter defaultCenter];

    [center addObserver:self selector:@selector(handleScreenConnectNotification:)
                   name:UIScreenDidConnectNotification object:nil];
    [center addObserver:self selector:@selector(handleScreenDisconnectNotification:)
                   name:UIScreenDidDisconnectNotification object:nil];
}
- (void)handleScreenConnectNotification:(NSNotification*)aNotification
{
    [self setupExternalScreen];
}

- (void)handleScreenDisconnectNotification:(NSNotification*)aNotification
{
    if ((AppObj).externalWindow)
    {
        (AppObj).externalWindow.hidden = YES;
        (AppObj).externalWindow = nil;

    }
}
-(UIInterfaceOrientationMask)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskAll;
}

- (BOOL)shouldAutorotate
{
    return YES;
}

外部VC.m

- (void)viewDidLoad {
    [super viewDidLoad];
    self.updatedImg.image = (AppObj).updatedImg;
}
- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
{
    [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];

    [coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context)
     {
//         UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
     } completion:^(id<UIViewControllerTransitionCoordinatorContext> context)
     {
        UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
         [[UIDevice currentDevice] setValue:@(orientation) forKey:@"orientation"];


         [UINavigationController attemptRotationToDeviceOrientation];
         [UIViewController attemptRotationToDeviceOrientation];
}];


}

Answer 1

现在你要使用旋转窗口，当窗口旋转时你也必须旋转图像做你想要的其他更改我给你一个带有设备旋转的旋转窗口只需用以下代码替换 ExternalVC.m

    //
//  ExternalVC.m
//  Sketch
//
//  Created by mac on 21/07/18.
//  Copyright © 2018 mac. All rights reserved.
//

#import "ExternalVC.h"

@interface ExternalVC ()

@end

@implementation ExternalVC

- (void)viewDidLoad {
    [super viewDidLoad];
    self.updatedImg.image = (AppObj).updatedImg;
    NSLog(@"External window bounds:%lu",(unsigned long)self.supportedInterfaceOrientations);
    NSNotificationCenter* center = [NSNotificationCenter defaultCenter];
    [center addObserver:self selector:@selector(orientationDidChange:)
                   name:UIDeviceOrientationDidChangeNotification object:nil];

}

- (void)orientationDidChange:(NSNotification*)aNotification
{
      NSLog(@"orientation did change :%@",aNotification);
    UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];
   // [self transformForOrientation:orientation];
    [self.view.window setTransform:[self transformForOrientation:orientation]];
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
- (UIInterfaceOrientationMask)supportedInterfaceOrientations{
    if ([UIScreen mainScreen] == (AppObj).externalWindow.screen || !(AppObj).externalWindow) {
        return UIInterfaceOrientationMaskAll;
    }else {
        return UIInterfaceOrientationMaskPortrait;
    }
}

- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
{
    [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];

    [coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context)
     {
//         UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
     } completion:^(id<UIViewControllerTransitionCoordinatorContext> context)
     {
//
//         NSLog(@"External window bounds:%f || %f",(AppObj).externalWindow.bounds.size.width,(AppObj).externalWindow.bounds.size.height);
//    //     UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
//     //    [(AppObj).externalWindow setValue:@(orientation) forKey:@"orientation"];
////         [[UIDevice currentDevice] setValue:@(orientation) forKey:@"orientation"];
////
////
////         [UINavigationController attemptRotationToDeviceOrientation];
//         [UIViewController attemptRotationToDeviceOrientation];
//          UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];
//        [self transformForOrientation:orientation];

     }];


}

#define DegreesToRadians(degrees) (degrees * M_PI / 180)

- (CGAffineTransform)transformForOrientation:(UIDeviceOrientation)orientation {


//        [self.view.window setFrame:CGRectMake(0, self.view.window.frame.size.height-50, self.view.window.frame.size.width, [UIScreen mainScreen].bounds.size.height)];
//        [self.view.window makeKeyAndVisible];


    switch (orientation) {

        case UIInterfaceOrientationLandscapeLeft:
            NSLog(@"UIInterfaceOrientationLandscapeLeft****");
            return CGAffineTransformMakeRotation(DegreesToRadians(90));


        case UIInterfaceOrientationLandscapeRight:
            NSLog(@"UIInterfaceOrientationLandscapeRightt****");
            return CGAffineTransformMakeRotation(-DegreesToRadians(90));

        case UIInterfaceOrientationPortraitUpsideDown:
            NSLog(@"UIInterfaceOrientationUpSideDownPortrait****");
            return CGAffineTransformMakeRotation(DegreesToRadians(180));

        case UIInterfaceOrientationPortrait:
        default:
            NSLog(@"UIInterfaceOrientationPortait****");
            return CGAffineTransformMakeRotation(DegreesToRadians(0));
    }
}

- (void)statusBarDidChangeFrame:(NSNotification *)notification {

    UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];
    NSLog(@"status bar orientation :%ld",(long)orientation);
  //  [self.view setTransform:[self transformForOrientation:orientation]];

}
-(BOOL)shouldAutorotate{
    return YES;
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end