不推荐使用旋转方法，相当于“didRotateFromInterfaceOrientation”？

Question

我正在尝试实现 iOS 8 中引入的新 viewWillTransitionToSize 方法（所有其他轮换方法都已弃用）。我想知道didRotateFromInterfaceOrientation 现在的等价物是什么，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UIViewControllerTransitionCoordinator 以便在何时调用的块“过渡”到新尺寸完成。谢谢。

Answer 1

好的找到了，只需要在传递的UIViewControllerTransitionCoordinator上使用animateAlongsideTransition:completion:方法即可。

- (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];
}

Answer 2

奇怪的答案的 Swift 版本

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)
}

Answer 3

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)
    }

Answer 4

Swift 3 中接受的答案：

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)
}

对我来说很好用?

Answer 5

因为问题是：didRotateFromInterfaceOrientation 的等价物是什么

我想我会贡献以下代码：

@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

我在模拟器中的 iPhone 上进行测试，但如果我使用 iPad 进行测试，我的打印语句将不会运行，因为 traitsCollection 不会改变。

这很奇怪，因为这正是 Apple recommends:

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

Answer 6

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

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

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

Answer 7

在 Ipad 上，特征集合没有变化，所以这里是您如何检测从开始到完成的旋转。这是 Swift 5 的语法：

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")


    }
}