ios - View 和 super View 之间的 NSSpace 属性必须匹配(自动布局)

Question

我在 View Controller 中有以下 View 层次结构:

view->subView->button

按钮必须放置在右侧，与总屏幕宽度成一定比例的距离。 subview (按钮的 super View )的前导和尾随约束为零。现在在 Storyboard中，我对按钮的前缘有以下约束:

button.leading = 343/375*trailing

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

打开界面构建器，找到约束导致错误并尝试将Constant字段中的值从Standard更改为0