不建议使用旋转方法，是否等同于'didRotateFromInterfaceOrientation'？

我正在尝试实现viewWillTransitionToSizeiOS 8中引入的新方法（不推荐使用其他所有旋转方法）。我想知道现在相当于什么，didRotateFromInterfaceOrientation因为我们需要执行许多清理任务，而且我看不到可以分配给您的块UIViewControllerTransitionCoordinator以便在“过渡”到新的块时被调用大小完成。谢谢。

好的，找到它了，只需要对animateAlongsideTransition:completion:passed 使用方法UIViewControllerTransitionCoordinator。

- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
{   
    [coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context)
    {
        UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
        // do whatever
    } completion:^(id<UIViewControllerTransitionCoordinatorContext> context)
    { 

    }];

    [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
}

Swift版本的答案很奇怪

override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {

    coordinator.animateAlongsideTransition({ (UIViewControllerTransitionCoordinatorContext) -> Void in

        let orient = UIApplication.sharedApplication().statusBarOrientation

        switch orient {
        case .Portrait:
            println("Portrait")
            // Do something
        default:
            println("Anything But Portrait")
            // Do something else
        }

        }, completion: { (UIViewControllerTransitionCoordinatorContext) -> Void in
            println("rotation completed")
    })

    super.viewWillTransitionToSize(size, withTransitionCoordinator: coordinator)
}

iOS 10.3和Swift 3

override func willTransition(to newCollection: UITraitCollection, with coordinator: UIViewControllerTransitionCoordinator) {

        coordinator.animate(alongsideTransition: { (_) in
            let orient = newCollection.verticalSizeClass

            switch orient {
            case .compact:
                print("Lanscape")///Excluding iPads!!!

            default:
                print("Portrait")
            }
        }, completion: { _ in
            print("rotation completed")
        })

        super.willTransition(to: newCollection, with: coordinator)
    }

Swift 3中公认的答案：

override func willTransition(to newCollection: UITraitCollection, with coordinator: UIViewControllerTransitionCoordinator) {
    coordinator.animate(alongsideTransition: { (_) in
        let orient = UIApplication.shared.statusBarOrientation

        switch orient {
        case .portrait:
            print("Portrait")
        // Do something
        default:
            print("Anything But Portrait")
            // Do something else
        }
    }, completion: { (UIViewControllerTransitionCoordinatorContext) -> Void in
      print("rotation completed")
    })

    super.willTransition(to: newCollection, with: coordinator)
}

对我来说很好

既然问题是：什么等于 didRotateFromInterfaceOrientation

我以为我会提供以下代码：

@implementation ViewController
- (void)traitCollectionDidChange:(UITraitCollection *)previousTraitCollection {
    [super traitCollectionDidChange:previousTraitCollection];
    if (previousTraitCollection.verticalSizeClass == UIUserInterfaceSizeClassRegular) {
        NSLog(@"User has rotated to landscape");
    } else if (previousTraitCollection.verticalSizeClass == UIUserInterfaceSizeClassCompact) {
        NSLog(@"User has rotated to portrait");
    }
}
@end

我正在模拟器中的iPhone上进行测试，但是如果我使用iPad进行测试，则不会运行我的打印语句，因为traitsCollection不会更改。

这很奇怪，因为这正是Apple的建议：

- (void) traitCollectionDidChange: (UITraitCollection *) previousTraitCollection {
    [super traitCollectionDidChange: previousTraitCollection];
    if ((self.traitCollection.verticalSizeClass != previousTraitCollection.verticalSizeClass)
        || self.traitCollection.horizontalSizeClass != previousTraitCollection.horizontalSizeClass)) {
        // your custom implementation here
    }
}

[[UIApplication sharedApplication] statusBarOrientation]在iOS9中已弃用，您必须针对各种设备针对UITraitCollection进行测试。

  override func willTransitionToTraitCollection(newCollection: UITraitCollection, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {

    if newCollection.containsTraitsInCollection(UITraitCollection(verticalSizeClass: .Regular)) {
      ...
    }
  }

在Ipad上，特征集没有变化，因此这是从开始到结束检测旋转的方法。这是Swift 5语法：

override func viewWillTransition(to size: CGSize, with coordinator: 
UIViewControllerTransitionCoordinator) {
    super.viewWillTransition(to: size, with: coordinator)

    coordinator.animate(alongsideTransition: { [unowned self] _ in

        self.view.backgroundColor = UIColor.blue
        print("rotation in progress")

    }) { [unowned self] _ in
        self.view.backgroundColor = UIColor.green
        print("rotation complete")


    }
}