以编程方式尝试NSLayoutContraint会导致“无法同时满足约束”。

问题描述：

我似乎有一些问题设置我的约束编程为我使用的UITableView。我的尝试是在下面，并尝试使用translatesAutoresizingMaskIntoConstraints可能的每个组合。以编程方式尝试NSLayoutContraint会导致“无法同时满足约束”。

self.view.translatesAutoresizingMaskIntoConstraints = NO; 
    _tableView.translatesAutoresizingMaskIntoConstraints = NO; 
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-100-[_tableView]-20-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(_tableView)]];

我只是想在UIViewController的UITableView的开始和结尾添加一个空格。任何人都可以帮忙吗？

长而长的错误在下面。

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:0x75c8500 h=-&- v=-&- UITableView:0x799e400.midY == UIView:0x71a4ec0.midY>", 
    "<NSLayoutConstraint:0x71a5800 V:[UITableView:0x799e400]-(20)-| (Names: '|':UIView:0x71a4ec0)>", 
    "<NSLayoutConstraint:0x71a5a60 V:|-(100)-[UITableView:0x799e400] (Names: '|':UIView:0x71a4ec0)>" 
) 

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x71a5800 V:[UITableView:0x799e400]-(20)-| (Names: '|':UIView:0x71a4ec0)> 

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. 
2013-04-04 20:06:57.648 New eCard[29731:c07] 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:0x75c8540 h=-&- v=-&- UITableView:0x799e400.height == UIView:0x71a4ec0.height>", 
    "<NSAutoresizingMaskLayoutConstraint:0x75c8500 h=-&- v=-&- UITableView:0x799e400.midY == UIView:0x71a4ec0.midY>", 
    "<NSLayoutConstraint:0x71a5a60 V:|-(100)-[UITableView:0x799e400] (Names: '|':UIView:0x71a4ec0)>" 
) 

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x71a5a60 V:|-(100)-[UITableView:0x799e400] (Names: '|':UIView:0x71a4ec0)> 

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. 
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:0x75c8540 h=-&- v=-&- UITableView:0x799e400.height == UIView:0x71a4ec0.height>", 
    "<NSAutoresizingMaskLayoutConstraint:0x75c8500 h=-&- v=-&- UITableView:0x799e400.midY == UIView:0x71a4ec0.midY>", 
    "<NSLayoutConstraint:0x71a5800 V:[UITableView:0x799e400]-(20)-| (Names: '|':UIView:0x71a4ec0)>" 
) 

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x71a5800 V:[UITableView:0x799e400]-(20)-| (Names: '|':UIView:0x71a4ec0)> 

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.

你创建IB或代码此表视图。它表明你在表视图和超视图之间有一个中间y约束。 – rdelmar 2013-04-05 02:24:59

哦，我真的很抱歉，我可以发誓，我把那部分放在那里。我用IB。 – 2013-04-05 02:38:28

如果您使用IB，为什么在代码中设置约束？当你在IB中创建对象时，你会得到Xcode放入的约束，并且它们可能与你正在添加的约束冲突。 – rdelmar 2013-04-05 02:43:39

答

我发现了关于UICollectionView的这个问题。我想这是开始调试的好点。

UICollectionView Cell + UiLabel with AutoLayout

与解决方案的其他一些环节我尝试没有成功： https://blog.safaribooksonline.com/2012/10/27/tip-unsatisfiable-auto-layouts-in-ios-6/ UITableView with autolayout and offset constraints

以编程方式尝试NSLayoutContraint会导致“无法同时满足约束”。

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