Question

我有一个故事板文件，我添加了一个UITableView和一个UIView。 UIView是我尝试制作一个半透明的自定义标题，因此通过它可以看到tableview（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.

任何关于为什么会这样做的想法都会有所帮助。感谢。

Answer 1

您已在界面构建器中配置了一个不可能的状态，正如消息所示，您无法同时满足您的布局约束。当你是新手时，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）这将使你摆脱这个问题

是的，你可以互相拥有两个视图，你只需要使用alpha值来配置半透明度

向UIView添加两个视图

1 个答案: