如何计算iOS 11大小的不同方向？ [英] How to calculate iOS 11 size in different orientation?

问题描述

我使用水平滚动和自定义布局计算取决于UICollectionView安全区域的itemSize。

I calculate itemSize dependent on safe area for UICollectionView with horizontal scroll and custom layout.

但对于iPhone X，安全区域的大小不同，方向不同。我的问题是如何在viewWillTransition函数中计算横向的安全区域大小？或者如何在没有这个计算的情况下做到这一点？

But for iPhone X safe area has different size for different orientation. My question is how should I calculate safe area size for landscape orientation in viewWillTransition function? Or how is it possible to do without this calculation?

推荐答案

编辑

要获得安全区域大小而不创建任何其他视图，请使用：

To get safe area size without creating any additional views, use this:

view.safeAreaLayoutGuide.layoutFrame.size

如果你想使用 viewWillTransition 方法你可以使用它：

If you want to use viewWillTransition method you can use this:

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

    // Before rotation
    print(view.safeAreaLayoutGuide.layoutFrame.size)

    coordinator.animate(alongsideTransition: { (context) in
        // During rotation
    }) { (context) in
        // After rotation
        print(self.view.safeAreaLayoutGuide.layoutFrame.size)
    }
}

在完成程序段中，您将获得所需的尺寸，但请注意，此代码将在强调后调用。

In the completion block you will get your desired size, note however, that this code will be called after the rotation.

原始答案

使用额外UIView的解决方案：

Solution using additional UIView:

我所做的是创建一个 UIView 并将其与常量0固定到安全区域指南，以便它始终与安全区域的大小相匹配：

What I did was to create a UIView and pin it with constant 0 to Safe Area Guides, so that it always matches size of Safe Area:

我创建了一个 @IBOutlet 的 UIView 并在 viewDidLayoutSubviews（）检查大小：

I created an @IBOutlet of that UIView and in viewDidLayoutSubviews() check the size:

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()

    print(containerView.frame.size)
}

轮换后我也得到了UIView的更新大小。

After rotation I also get the updated size of that UIView.

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