估计行高怪异的HeightForHeaderInSection [英] estimatedHeightForHeaderInSection acting weird

问题描述

我已经在表格视图中添加了一个自定义标头，它使用动态类型，并且希望它具有自定义大小.

I've added a custom header to my table view and it uses dynamic type and I want it to be self sizing.

所以我将此添加到了viewDidLoad:

self.tableView.sectionHeaderHeight = UITableViewAutomaticDimension

这是我其余的表格视图方法:

And this to the rest of my table view methods:

override func tableView(tableView: UITableView, estimatedHeightForHeaderInSection section: Int) -> CGFloat {
    return 22
}

然后我的标头单元太大，无法自动调整大小，我收到此错误消息:

Then my header cells were way too large and not self sizing and I got this error message:

Warning once only: Detected a case where constraints ambiguously suggest a height of zero for a tableview cell's content view. We're considering the collapse unintentional and using standard height instead.

所以我开始玩耍，删除了estimatedHeightForHeaderInSection方法并改为实现了estimatedHeightForFooter.然后我的标题看起来很完美！但是页脚也开始显示，这是我不想要的.因此，我添加了heightForFooter方法并将其设置为0，现在，所有这些方法都像我想的那样工作了.

So I started playing around and I removed the estimatedHeightForHeaderInSection method and implemented estimatedHeightForFooter instead. And then my header looked perfect! But a footer started showing too, which I didn't want. So I added the heightForFooter method and set it to 0, and now it all works like I wanted in the first place.

不过，我发现这很奇怪.我是新手，但我希望estimatedHeightForHeader用于页眉，而estimatedHeightForFooter用于页脚.这是一个错误吗?难道我做错了什么?有没有更好的方法可以完成我想做的事情?

I'm finding this very weird, though. I'm new at all this, but I expected estimatedHeightForHeader to work for the header and estimatedHeightForFooter to work for the footer. Is this a bug? Am I doing something wrong? Is there a better way to accomplish what I'm trying to do?

谢谢.

丹尼尔

我接受了Omkar的回答，因为当时它对我有用，但是我仍然不明白为什么我不应该同时使用这两种方法.不过，我在标题中使用的是常规单元格，现在我发现这样做会导致各种奇怪的事情发生.因此，我只是以编程方式更改了UITableViewHeaderFooterView，现在一切正常，但是我确实必须实现这两种方法，就像我首先想到的那样，否则标题将无法正确调整大小.

I accepted Omkar's answer because it worked for me at the time, but I still didn't understand why I shouldn't use both methods. I was using a regular cell for my header, though, and now I found out that doing that causes all sorts of weird things to happen. So I just programmatically changed the UITableViewHeaderFooterView instead, and now it all works out, but I do have to implement both methods, like I first thought, otherwise the header doesn't resize properly.

推荐答案

不要同时使用这两者从您的代码中将其删除

Don't use both remove this from your code

self.tableView.sectionHeaderHeight = UITableViewAutomaticDimension

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