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我有一个故事板文件，其中添加了一个 UITableView 和一个 UIView。UIView 是我尝试制作一个自定义标题，它将是半透明的，因此 tableview 将通过它可见（我不确定这是否可能，因为我是新手，这是我的第一个 iPhone 应用程序）。

在处理了与我的 ViewController 类的所有连接后，当我运行代码时，我给了我这个错误：

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) 
(
"<NSAutoresizingMaskLayoutConstraint:0x8988060 h=--& v=--& V:[UIView:0x7574100(460)]>",
"<NSLayoutConstraint:0x7574780 V:|-(0)-[UIView:0x75742b0]   (Names: '|':UIView:0x7574100      )>",
"<NSLayoutConstraint:0x7574700 V:[UIView:0x75742b0]-(494)-|   (Names: '|':UIView:0x7574100)>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7574700 V:[UIView:0x75742b0]-(494)-|   (Names: '|':UIView:0x7574100     )>

Break on objc_exception_throw to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in   <UIKit/UIView.h> may also be helpful.

关于为什么会发生这种情况的任何想法都会有所帮助。谢谢。

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1 回答 1

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您已经在界面构建器中配置了一个不可能的状态，正如消息所述，您所拥有的布局约束不能一次全部满足。由于您是新手，我建议禁用自动布局约束（转到文档选项卡 - 最左边的选项卡 - 在界面构建器中并取消选中自动布局）这将使您摆脱这个问题

是的，你可以有两个相互叠加的视图，你只需要使用 alpha 值来配置半透明

于 2012-12-26T15:42:59.270 回答