自动版式无法满足似乎没有冲突的约束

Question

我已将80x80的自定义UIView放入具有以下约束的自定义UITableViewCell中。

内容视图的高度为80，而安全区域和总体UITableViewCell的高度为80.5，这可能是单元格之间的界线。 Xcode在构建过程中不会抱怨。我没有在应用程序的其他地方设置任何其他硬编码的约束。

尽管在运行时看起来似乎不正确，但在运行时仍存在冲突：

[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:0x283f60190 WindDirectionIndicator:0x104f32ac0.height == 80   (active)>",
    "<NSLayoutConstraint:0x283f60230 V:[WindDirectionIndicator:0x104f32ac0]-(0)-|   (active, names: '|':UITableViewCellContentView:0x104f326d0 )>",
    "<NSLayoutConstraint:0x283f60280 V:|-(0)-[WindDirectionIndicator:0x104f32ac0]   (active, names: '|':UITableViewCellContentView:0x104f326d0 )>",
    "<NSLayoutConstraint:0x283f60550 'UIView-Encapsulated-Layout-Height' UITableViewCellContentView:0x104f326d0.height == 80   (active)>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x283f60190 WindDirectionIndicator:0x104f32ac0.height == 80   (active)>

似乎同意边界位于顶部和底部，并且单元格和UIView均为80高。我在这里想念什么？