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

问题描述

我有一个自定义的 UITableViewCell，它有一个缩略图和一堆文本.行高配置为使用

自动计算

tableView.estimatedRowHeight = 129;tableView.rowHeight = UITableViewAutomaticDimension

行高应精确计算为 138 点.iPhone 5 上的一切看起来都很棒.但是，在 iPhone 6 Plus 上，自动行高会间歇性地失败，因为随机行会出现以下日志.

<代码>("<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计算为 138.333 而不是 138.我一直在敲我的头一段时间，但我无法弄清楚为什么会这样.有人可以帮忙吗?

更新:这是我的表格视图单元格的样子.

更新 我无法从主存储库中获取代码，因为它是更大项目的一部分.但是我设法通过一个非常简单的理智项目重现了这个问题.请在

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

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)]>"
)

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?

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

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.

解决方案

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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