iOS viewWillTransitionToSize和设备方向

Question

我正在使用viewWillTransitionToSize来检测设备何时旋转到横向.根据目标大小,我可以检测是否前往景观并根据需要调整我的特征......

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

    if size.width > size.height {
        self.setOverrideTraitCollection(UITraitCollection(horizontalSizeClass: UIUserInterfaceSizeClass.Regular), forChildViewController: viewController)
    }
    else{
        self.setOverrideTraitCollection(nil, forChildViewController: viewController)
    }

    super.viewWillTransitionToSize(size, withTransitionCoordinator: coordinator)
}

但是,我希望能够检测我的设备是转换到横向左侧还是横向右侧.这将允许我根据设备的具体方向创建不同的行为或视图.(左还是右).

这可能不使用任何已弃用的函数吗？

我想过使用状态栏方向......

    let orientation = UIApplication.sharedApplication().statusBarOrientation;
    if( orientation == UIInterfaceOrientation.LandscapeLeft )
    {
        // Do something
    }
    else if( orientation == UIInterfaceOrientation.LandscapeRight )
    {
        // Do something else
    }

...但这没有用,因为这似乎给出了"旧的"状态方向.

如何获得特定的目标定位？

Answer 1

您可以在旋转使用时获得方向UIViewControllerTransitionCoordinator,如下所示:

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

    // will execute before rotation

    coordinator.animate(alongsideTransition: { (context: UIViewControllerTransitionCoordinatorContext) in

        // will execute during rotation
        let orientation = UIApplication.shared.statusBarOrientation
        if orientation == .landscapeLeft 
        {
            // Do something
        } 
        else if orientation == .landscapeRight 
        {
            // Do something else
        }
    }) { (context: UIViewControllerTransitionCoordinatorContext) in
        // will execute after rotation
    }
}

Answer 2

使用[UIDevice currentDevice].orientation