Swift约束警告

Question

我尝试了所有方法，但找不到针对此警告的解决方案 XCode 向我抛出：

我有一个带有单元格的 tableView。

单元格是动态高度的，因为它们内部有视图："message bubble"。

在消息气泡内，我有一个标签。如果单击消息气泡，标签的上下边距限制会扩大。

消息气泡上方有一个时间标签。

我收到此警告：

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2018-08-15 10:50:40.805762+0200 PipeTest[2521:879876] [LayoutConstraints] Unable to simultaneously satisfy constraints.
    Probably at least one of the constraints in the following list is one you don't want. 
    Try this: 
        (1) look at each constraint and try to figure out which you don't expect; 
        (2) find the code that added the unwanted constraint or constraints and fix it. 
(
    "<NSLayoutConstraint:0x1c0296670 V:[UILabel:0x102790380'Hehe']-(14)-|   (active, names: '|':UIView:0x10278ff60 )>",
    "<NSLayoutConstraint:0x1c02945f0 V:|-(14)-[UILabel:0x102790380'Hehe']   (active, names: '|':UIView:0x10278ff60 )>",
    "<NSLayoutConstraint:0x1c0299780 UIView:0x102790b20.height == 27   (active)>",
    "<NSLayoutConstraint:0x1c0296d00 UILabel:0x102773e60' 9 minutes ago'.height == 18   (active)>",
    "<NSLayoutConstraint:0x1c02926b0 UIView:0x102790b20.bottom == UITableViewCellContentView:0x102784510.bottomMargin   (active)>",
    "<NSLayoutConstraint:0x1c02963a0 V:[UIView:0x10278ff60]-(7.67)-[UIView:0x102790b20]   (active)>",
    "<NSLayoutConstraint:0x1c0298a10 V:[UILabel:0x102773e60' 9 minutes ago']-(3)-[UIView:0x10278ff60]   (active)>",
    "<NSLayoutConstraint:0x1c0297070 UILabel:0x102773e60' 9 minutes ago'.top == UITableViewCellContentView:0x102784510.topMargin   (active)>",
    "<NSLayoutConstraint:0x1c0296760 'UIView-Encapsulated-Layout-Height' UITableViewCellContentView:0x102784510.height == 94   (active)>"
)

我做错了什么？

Answer 1

您已经定义了几个高度约束（尺寸）以及垂直约束。可能，你过度约束了。按照提议，降低大部头垂直约束的优先级。

Swift约束警告

Swift constraint warning

warnings

constraints

swift