UITableView自动调整大小的行约束在iPhone 6Plus上神秘地打破 [英] UITableView auto resizing row constraint breaking mysteriously on iPhone 6Plus

问题描述

我有一个自定义UITableViewCell，其中包含缩略图和一堆文本.行高配置为使用

I have a custom UITableViewCell which has a thumbnail and bunch of text. The row height is configured to be calculated automatically using

tableView.estimatedRowHeight = 129;
tableView.rowHeight = UITableViewAutomaticDimension

行高应精确地计算为 138 个点. 在iPhone 5上，一切看起来都很不错.但是，在iPhone 6 Plus上，具有以下日志的随机行的自动行高会间歇性地失败.

The row height should be calculated as exactly 138 points. Everything looks great on the iPhone 5. However, on iPhone 6 Plus, the auto row height fails INTERMITTENTLY for random rows with the following log.

(
    "<NSLayoutConstraint:0x17009ddd0 V:|-(20)-[scoop.ThumbnailImage:0x124d2a5a0]   (Names: '|':UITableViewCellContentView:0x124e23200 )>",
    "<NSLayoutConstraint:0x17009de70 UITableViewCellContentView:0x124e23200.bottomMargin == scoop.ThumbnailImage:0x124d2a5a0.bottom + 20>",
    "<NSLayoutConstraint:0x17009e780 V:[scoop.ThumbnailImage:0x124d2a5a0(90)]>",
    "<NSLayoutConstraint:0x17009ef00 'UIView-Encapsulated-Layout-Height' V:[UITableViewCellContentView:0x124e23200(138.333)]>"
)

日志的最后一行似乎说，由于某种原因，行高被计算为 138.333 而不是138 .我已经打了一段时间，但我不知道为什么会这样.有人可以帮忙吗?

The last line of the log seems to say that for some reason the row height was calculated as 138.333 instead of 138. I have been banging my head for a while now but I am unable to figure out why this is happening. Can some one please help?

更新:这是我的表格视图单元格的样子.

Update: This is how my table view cell looks like.

更新我无法从主存储库中获取代码，因为它是较大项目的一部分.但是我设法通过一个非常简单的理智的项目重现了这个问题.请在在github上找到它.

UPDATE I couldn't get the code out of the main repo since its a part of a bigger project. But I have managed to reproduce the issue with a very simple sane project. Please find it here on github.

推荐答案

此警告告诉您约束中存在冲突. 将高度限制的优先级降低到999，它将消失.在您的Github项目中对其进行了测试，并且效果很好.

This warning is telling you there's a conflict in your constraints. Reduce the priority of the height constraint to 999 and it will go away. Tested it in your Github project and worked perfectly.

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