-[UITableView layoutSublayersOfLayer:]中的断言失败 [英] Assertion failure in -[UITableView layoutSublayersOfLayer:]

问题描述

我想在UIViewController上使用UISearchDisplayController，其中包括UITableView.
我使用自动版式.当我尝试将SearchBar(_searchBar)放在tableHeaderView中时，

I want to use an UISearchDisplayController on UIViewController, that includes an UITableView.
I use Autolayout. When i try to put the SearchBar (_searchBar) in the tableHeaderView with

self.tableView.tableHeaderView = _searchBar;

我得到了错误 'NSInternalInconsistencyException'，原因:'执行-layoutSubviews之后仍需要自动布局. UITableView的-layoutSubviews实现需要调用super.'

I get the error 'NSInternalInconsistencyException', reason: 'Auto Layout still required after executing -layoutSubviews. UITableView's implementation of -layoutSubviews needs to call super.'

禁用自动布局，错误消失，但是我需要自动布局...

Disabling Autolayout, the error disappears, but i need Autolayout...

当我使用自定义单元格"或标准单元格"时出现错误...

The error appears, when I use Custom Cells or StandardCells...

当TableView没有行时出现错误...

The error appears, when the TableView has no rows...

推荐答案

作为此问题的一般解决方案，或者至少是一种找到其原因的方法:

As a general solution to this problem, or at least a way of finding the cause of it:

• 打开异常断点
• 子类UITableView并覆盖layoutSublayersOfLayer:，仅调用super
• 运行您的应用-您将停止使用新方法
• 在调试器中，键入po [self _autolayoutTrace]

• Turn on exception breakpoints
• Subclass UITableView and override layoutSublayersOfLayer:, just calling super
• Run your app - you will stop in your new method
• In the debugger, type po [self _autolayoutTrace]

这将向您显示窗口中每个视图的打印输出，其中自动布局无法通过星号或AMBIGUOUS LAYOUT突出显示的解决方案的视图.这些是您需要研究约束的视图.

This will show you a printout of every view in the window, with the views where auto layout has not been able to come up with a solution highlighted by asterisks or AMBIGUOUS LAYOUT. These are the views you need to investigate the constraints for.

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