如何防止iOS 13中的uinavigationbar和视图之间出现间隙? [英] How to prevent gap between uinavigationbar and view in iOS 13?

问题描述

当前在iOS 13中使用模式演示时，导航栏的大小存在问题.

We are currently having an issue with navigation bar sizing when using modal presentation in iOS 13.

在大多数情况下，此效果很好，如以下屏幕截图所示:

In most cases this works fine as can be seen in this screenshot:

但是，在一些屏幕中，我们得到了这种奇怪的效果，导航栏的高度较低，并且在它和视图之间有一个奇怪的透视"间隙.如该屏幕截图所示:

However, in a few screens we get this weird effect, with the navigation bar having a lower height and a weird "see-through" gap between it and the view. As seen in this screenshot:

这两个视图控制器都为其属性设置了相同的值，以模态表示，并且在其子视图上具有相同的约束(与superview/margins/top布局指南的间距为0).

Both of the view controllers have the same values set for their properties, are modally presented and have the same constrains on their subviews (0 spacing from the superview/margins/top layout guide).

即使使用iOS 13 SDK构建，此问题在iOS 12中也不会发生.这是iOS 13(测试版8)中的已知问题，还是我们应该在代码/故事板上进行一些调整?

This issue doesn't happen in iOS 12, even when built with the iOS 13 SDK. Is this a known issue in iOS 13 (beta 8), or is there something we should adjust in the code/storyboard?

推荐答案

override func viewWillAppear(_ animated: Bool) {  
    super.viewWillAppear(animated)  
    if #available(iOS 13.0, *) {  
        navigationController?.navigationBar.setNeedsLayout()  
    }
}  

我们在此处找到了这项工作，并且对我们有用.

We found this work around here and it worked for us.

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