仅限模拟器中的 iOS 约束错误

Question

我使用 Xcode Storyboard 设计了我的 iOS 应用程序 UI，现在一切看起来都很好，没有错误，没有警报。

当我在模拟器中运行我的应用程序时，我得到一个列表Unable to simultaneously satisfy constraints。这个列表非常模糊。

    "<NSLayoutConstraint:0x7b617600 UIButton:0x7b6112f0.width == UIButton:0x7b6112f0.height>",
    "<NSLayoutConstraint:0x7b7abd20 UIButton:0x7b7a3180.centerY == UIButton:0x7b79d0f0.centerY>",
    "<NSLayoutConstraint:0x7b7abd50 UIButton:0x7b7a3180.width == UIButton:0x7b6112f0.width>",
    "<NSLayoutConstraint:0x7b7abd80 UIButton:0x7b7a3180.height == UIButton:0x7b6112f0.height>",
    "<NSLayoutConstraint:0x7b7abdb0 UIButton:0x7b7a3180.centerX == UIButton:0x7b770ec0.centerX>",
    "<NSLayoutConstraint:0x7b7abde0 V:[UIButton:0x7b7a3180]-(2)-[UIButton:0x7b770ec0]>",
    "<NSLayoutConstraint:0x7b7abe30 H:|-(0)-[UIButton:0x7b770ec0]   (Names: '|':UIView:0x7b7abbf0 )>",
    "<NSLayoutConstraint:0x7b7abe60 UIButton:0x7b79d0f0.centerY == UIButton:0x7b78ff40.centerY>",
    "<NSLayoutConstraint:0x7b7abec0 H:[UIButton:0x7b7a3180]-(NSSpace(8))-[UIButton:0x7b79d0f0](LTR)>",
    "<NSLayoutConstraint:0x7b7abf20 UIButton:0x7b79d0f0.width == UIButton:0x7b6112f0.width>",
    "<NSLayoutConstraint:0x7b7abf50 UIButton:0x7b6112f0.height == UIButton:0x7b770ec0.height>",
    "<NSLayoutConstraint:0x7b7abf80 UIButton:0x7b6112f0.height == UIButton:0x7b78ff40.height>",
    "<NSLayoutConstraint:0x7b7abfb0 UIButton:0x7b6112f0.centerY == UIButton:0x7b770ec0.centerY>",
    "<NSLayoutConstraint:0x7b7abfe0 UIButton:0x7b6112f0.width == UIButton:0x7b78ff40.width>",
    "<NSLayoutConstraint:0x7b7ac010 UIButton:0x7b6112f0.width == UIButton:0x7b770ec0.width>",
    "<NSLayoutConstraint:0x7b7ac040 V:|-(2)-[UIButton:0x7b78ff40]   (Names: '|':UIView:0x7b7abbf0 )>",
    "<NSLayoutConstraint:0x7b7ac070 H:[UIButton:0x7b79d0f0]-(NSSpace(8))-[UIButton:0x7b78ff40](LTR)>",
    "<NSLayoutConstraint:0x7b7ac0a0 H:[UIButton:0x7b78ff40]-(0)-|(LTR)   (Names: '|':UIView:0x7b7abbf0 )>",
    "<NSLayoutConstraint:0x7b7ac0d0 UIButton:0x7b60d210.height == UIButton:0x7b6112f0.height>",
    "<NSLayoutConstraint:0x7b7ac100 UIButton:0x7b60d210.centerY == UIButton:0x7b6112f0.centerY>",
    "<NSLayoutConstraint:0x7b7ac130 UIButton:0x7b60d210.bottom == UIView:0x7b7abbf0.bottom>",
    "<NSLayoutConstraint:0x7b7ac390 V:[UIView:0x7b7abb60(<=190)]>",
    "<NSLayoutConstraint:0x7b7ac3c0 H:[UIView:0x7b7abbf0]-(4)-|(LTR)   (Names: '|':UIView:0x7b7abb60 )>",
    "<NSLayoutConstraint:0x7b7ac420 UIView:0x7b7abb60.centerX == UIView:0x7b7abbf0.centerX>",
    "<NSLayoutConstraint:0x7b7ac450 V:[UIView:0x7b7abbf0]-(>=2)-|   (Names: '|':UIView:0x7b7abb60 )>",
    "<NSLayoutConstraint:0x7b7ac4b0 UIView:0x7b7abb60.centerY == UIView:0x7b7abbf0.centerY>",
    "<NSLayoutConstraint:0x7b7bce60 H:[UIView:0x7b7abb60]-(0)-|(LTR)   (Names: '|':UIView:0x7b7a9640 )>",
    "<NSLayoutConstraint:0x7b7bce90 H:|-(0)-[UIView:0x7b7abb60](LTR)   (Names: '|':UIView:0x7b7a9640 )>",
    "<NSAutoresizingMaskLayoutConstraint:0x7bfa9e30 h=--& v=--& H:[UIView:0x7b7a9640(320)]>"

这是哪个按钮:UIButton:0x7b6112f0？

这是哪个约束:NSLayoutConstraint:0x7b7bce90？

在 Xcode Identity inspector 中，我找到了一个 Label 字段，我标记了我所有的按钮。但是当在模拟器中运行时，这些标签没有任何好处。

我如何从这个输出中识别对象？

Answer 1

您添加了过多的约束并复制了所需的内容。您应该避免添加重复的约束。