ios - 为什么自动布局预览和实际设备不匹配

Question

我正在做 xamarin.ios，我正在做 UI，即 xcode 中的自动布局。

在 xcode 预览中...我可以看到 UI 很好，但在某些设备的设备中，UI 与预览中显示的不一样。

例如iPhone 5s,iPhone 6s plus。

谁能告诉我为什么会这样以及如何解决这个问题

谢谢

Answer 1

导致自动布局错误的原因有很多。有些是因为屏幕比例不同，有些是因为 iOS 版本不同。

你应该查看你的调试器输出并检查这样的消息:

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. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
    "<NSLayoutConstraint:0x7fc82d3e18a0 H:[UIView:0x7fc82aba1210(768)]>",
    "<NSLayoutConstraint:0x7fc82d6369e0 H:[UIView:0x7fc82aba1210]-(0)-|   (Names: '|':UIView:0x7fc82d6b9f80 )>",
    "<NSLayoutConstraint:0x7fc82d636a30 H:|-(0)-[UIView:0x7fc82aba1210]   (Names: '|':UIView:0x7fc82d6b9f80 )>",
    "<NSLayoutConstraint:0x7fc82d3e7fd0 'UIView-Encapsulated-Layout-Width' H:[UIView:0x7fc82d6b9f80(50)]>"
)

不仅仅是调试它。