如何在IOS 11之前以编程方式获取安全区的高度? [英] How to get Height of Safe Area Programmatically Prior to IOS 11?

问题描述

无需使用safeAreaLayoutGuide(我的目标是IOS 9+)，有什么方法可以以编程方式获取IOS中安全区域"的高度，而不必为此专门创建新视图(仅限于安全区域)?

Without using safeAreaLayoutGuide (I am targeting IOS 9+), is there any way to programmatically get the height of the "safe area" in IOS without having to create a new view (constrained to the safe area) solely for this purpose?

我无法在安全区域设置出口，因为它不是UIView ...甚至不是任何种类的类.

I can't set an outlet to the safe area because it's not a UIView... or even a class of any sort.

如果我只是在ViewController中使用self.view.height，它将太高(错误).

And if I simply use self.view.height in the ViewController, it's going to be too high (wrong).

还有其他方法吗?

推荐答案

在 UIViewController 中，您可以使用像这样的顶部和底部布局指南:

In a UIViewController you can use the top and bottom layout guides like this:

let safeAreHeight = self.view.frame.height - self.topLayoutGuide.length - self.bottomLayoutGuide.length

对于 UIView ，您可以使用 safeAreaLayoutGuide 进行条件检查:

For UIView you can use the safeAreaLayoutGuide with a conditional check:

let verticalSafeAreaInset: CGFloat
if #available(iOS 11.0, *) {
  verticalSafeAreaInset = self.view.safeAreaInsets.bottom + self.view.safeAreaInsets.top
} else {
  verticalSafeAreaInset = 0.0
}
let safeAreaHeight = self.view.frame.height - verticalSafeAreaInset

由于运行iOS 9和10的设备没有安全区域，因此默认设置为0.0是安全的.

As devices running iOS 9 and 10 have no safe area, it is safe to default to 0.0.

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