ios - 以编程方式为特定 View Controller 设置设备方向

Question

我想以编程方式将设备方向设置为特定 View Controller 的横向模式，如果我与 UIAlertController 一起使用，使用是/否选项，它工作正常，但如果我直接在按钮单击时编写相同的代码。它不起作用。

使用 UIAlertController 的工作代码，

 UIAlertController * alert=[UIAlertController
alertControllerWithTitle:APP_NAME message:@"Please Select Video Orientation."preferredStyle:UIAlertControllerStyleAlert];

 UIAlertAction* yesButton = [UIAlertAction
                                    actionWithTitle:@"Landscape Mode"
                                    style:UIAlertActionStyleDefault
                                    handler:^(UIAlertAction * action)
                                    {
                                        NSNumber *value = [NSNumber numberWithInt:UIInterfaceOrientationLandscapeLeft];
                                        [[UIDevice currentDevice] setValue:value forKey:@"orientation"];
                                        [self.navigationController pushViewController:mySecondViewController animated:NO];
                                    }];
 UIAlertAction* noButton = [UIAlertAction
                                   actionWithTitle:@"Portrait Mode"
                                   style:UIAlertActionStyleDefault
                                   handler:^(UIAlertAction * action)
                                   {
                                       NSNumber *value = [NSNumber numberWithInt:UIInterfaceOrientationPortrait];
                                       [[UIDevice currentDevice] setValue:value forKey:@"orientation"];
                                       [self.navigationController pushViewController:mySecondViewController animated:NO];
                                   }];

 [alert addAction:yesButton];
 [alert addAction:noButton];

 [self presentViewController:alert animated:YES completion:nil];

上面的代码运行良好，但我想在不询问警报的情况下强制下一个 Controller 处于横向模式，所以直接在按钮点击上编写代码，这样，

  NSNumber *value = [NSNumber numberWithInt:UIInterfaceOrientationLandscapeLeft];
  [[UIDevice currentDevice] setValue:value forKey:@"orientation"];
  [self.navigationController pushViewController:mySecondViewController animated:NO];

但是同样的代码运行不正常。它将首先以纵向方式打开 mySecondViewController，然后我们必须手动倾斜手机一次，然后它才会进入横向。

我尝试了很多选择，但没有运气。使用 iOS 10.1 在 iPhone5 和 iPhone6 上测试

---

更新:添加 mySecondViewController 代码，这是第二个 View Controller 代码，

-(void)viewWillAppear:(BOOL)animated{
    self.navigationController.navigationBar.hidden = NO;
}

- (void)viewDidAppear:(BOOL)animated {
    // [super viewDidAppear:animated];

    NSNumber *value = [NSNumber numberWithInt:UIInterfaceOrientationLandscapeLeft|UIInterfaceOrientationLandscapeRight];
    [[UIDevice currentDevice] setValue:value forKey:@"orientation"];
}

-(BOOL)shouldAutorotate
{
    return YES;
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
    return UIInterfaceOrientationLandscapeLeft | UIInterfaceOrientationLandscapeRight;
}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
    return UIInterfaceOrientationMaskLandscape | UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight;
}

Answer 1

尝试此方法强制 View 在 swift 中以横向模式启动:在 viewWillAppear 中使用此代码

let value = UIInterfaceOrientation.LandscapeLeft.rawValue
UIDevice.currentDevice().setValue(Int(value), forKey: "orientation")

和

override func shouldAutorotate() -> Bool {
    return true
}