UISearchController searchBar 框架仅在第一次单击时调整大小 [英] UISearchController searchBar frame only resizes on first click

问题描述

我刚刚在一个普通的 UIViewController 中实现了一个 UISearchController，我遇到了一个奇怪的问题.

I have just implemented a UISearchController in a regular UIViewController, and I have a kind of weird issue.

我有一个 UIView，它完全适合我希望 UISearchBar 的大小.在第一次启动视图时，我将我的 UISearchBar 作为子视图添加到这个 UIView.但是当我启动它时， UISearchBar 不占用其父 UIView 的大小——它只占用整个屏幕的宽度.

I have a UIView that is adapted exactly to the size I want my UISearchBar to take. On first launch of the view, I add my UISearchBar as a SubView to this UIView. But when I launch it, the UISearchBar doesn't take the size of its parent UIView -- it just takes the width of the whole screen.

如您所见，它与右侧的按钮重叠.

As you can see, it overlaps with the button on the right.

但是一旦我点击搜索栏并取消它，它就会调整到我想要的确切大小.

But once I click on the search bar and cancel it, it resizes to the exact size I want.

这可能是什么问题?我尝试将 AutoLayout Constraints 从 SearchBar 添加到其父视图，但它似乎没有任何改变.[UIView addSubview:] 不处理这个吗?

What could be the issue here? I've tried adding AutoLayout Constraints from the SearchBar to its parent view but it doesn't seem to change anything. Doesn't [UIView addSubview:] handle this?

推荐答案

UISearchController 的视图行为确实很奇怪，但有一个简单的解决方法.

UISearchController's view behaviour is weird indeed, but there is a simple workaround.

• 使用额外的容器视图
• 将 UISearchController 的视图放入其中
• 将 UISearchController 的视图自动调整大小掩码设置为 UIViewAutoresizingFlexibleWidth |UIViewAutoresizingFlexibleHeight
• 将 UISearchController 的框架设置为容器的视图边界

此时 UISearchController.view 的大小不会超过 container.bounds.

At this point UISearchController.view won't resize beyond container.bounds.

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