视图和超级视图之间的 NSSpace 属性必须匹配（自动布局）

Question

我在视图控制器中有以下视图层次结构：

视图->子视图->按钮

该按钮必须放置在右侧，与总屏幕宽度成一定比例的距离。子视图（按钮的超级视图）的前导和尾随约束为零。现在在故事板中，我对按钮的前缘有以下约束：

按钮.前导 = 343/375*尾随

当我运行应用程序时，按钮位于正确的位置，但出现以下自动布局错误：

[LayoutConstraints] Could not resolve symbolic constant for constraint, because: Attributes must match for NSSpace between view and superview.
mismatched attributes: leading of <UIButton: 0x7f86efd51410; frame = (378.667 -1.33333; 8 21); opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x600000433780>>, and trailing of <UIView: 0x7f86efe42410; frame = (0 60; 414 277); autoresize = RM+BM; gestureRecognizers = <NSArray: 0x600000447830>; layer = <CALayer: 0x60c000238660>>
Use a symbolic breakpoint at NSLayoutConstraintFailedToFindDefaultResolvedValueForSymbolicConstant to debug.

Answer 1

打开接口生成器，找到约束导致错误并尝试将 Constant 字段中的值从 更改Standard为0