Question

我有一个观点。在该视图中，我在代码中生成了许多子视图。我希望每个子视图都伸展到封闭视图的宽度。我尝试在代码中添加约束但是我得到了运行时异常。

   NSView *trackcontainer = [self trackContainerWithTrack:track];
   [self addSubview:trackcontainer];
   [trackcontainer addConstraints: [NSLayoutConstraint
       constraintsWithVisualFormat:@"|-5-[trackcontainer]-5-|"
                           options:0 metrics:nil
                             views:NSDictionaryOfVariableBindings(trackcontainer)]];

例外是：

2014-05-12 16:58:20.812 testApp[7597:303] Unable to install constraint on view.
Does the constraint reference something from outside the subtree of the view?
That's illegal. constraint:<NSLayoutConstraint:0x60000028e880 H:|-(5)-[BTSDoubleClickView:0x600000340fd0]
(Names: '|':BTSAlbumTracklistView:0x608000137c00 )> view:<BTSDoubleClickView: 0x600000340fd0>

嗯，当然，它不在视野之内。我希望它能引用超视图，这就是我使用管道字符的原因。

编辑：我刚刚意识到我应该在superview中添加约束，而不是子视图。我做到了，但现在我得到了一个不同的错误：

2014-05-12 22:37:47.218 autolayouttest[29399:303] Unable to simultaneously satisfy constraints:
(
    "<NSAutoresizingMaskLayoutConstraint:0x61800009e730 h=--& v=--& H:|-(10)-[NSView:0x60000013aa40]   (Names: '|':FunkyView:0x60800013aa40 )>",
    "<NSLayoutConstraint:0x60000009eaa0 H:|-(NSSpace(20))-[NSView:0x60000013aa40]   (Names: '|':FunkyView:0x60800013aa40 )>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x60000009eaa0 H:|-(NSSpace(20))-[NSView:0x60000013aa40]   (Names: '|':FunkyView:0x60800013aa40 )>

Set the NSUserDefault NSConstraintBasedLayoutVisualizeMutuallyExclusiveConstraints to YES to have -[NSWindow visualizeConstraints:] automatically called when this happens.  And/or, break on objc_exception_throw to catch this in the debugger.

我知道存在冲突，可能是因为我在创建视图框架时指定了宽度/高度？我真的不知道从哪里开始。我需要添加多少约束？我可以删除AutoresizingMaskLayoutConstraint吗？我在视图上没有任何自动调整遮罩（我尝试将其设置为0以防万一，没有区别。）

Answer 1

当使用自动布局代替AutoresizingMasks时，您需要在视图上调用setTranslatesAutoresizingMaskIntoConstraints:NO。

https://developer.apple.com/library/mac/documentation/cocoa/reference/applicationkit/classes/NSView_Class/Reference/NSView.html#//apple_ref/doc/uid/20000014-SW157

Autolayout灵活的宽度

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