UITableViewCell中iOS7上的自动布局约束问题

我以编程方式使用自动布局约束来布局我的自定义UITableView单元格，并且我正确地定义了tableView:heightForRowAtIndexPath:中的单元格大小

它在iOS6上运行得很好，在iOS7上也运行得很好

但当我在iOS7上运行这款应用时，我在控制台上看到了这样的消息:

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.
2013-10-02 09:56:44.847 Vente-Exclusive[76306:a0b] 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:0xac4c5f0 V:|-(15)-[UIImageView:0xac47f50]   (Names: '|':UITableViewCellContentView:0xd93e850 )>",
        "<NSLayoutConstraint:0xac43620 V:[UIImageView:0xac47f50(62)]>",
        "<NSLayoutConstraint:0xac43650 V:[UIImageView:0xac47f50]-(>=0)-[UIView:0xac4d0f0]>",
        "<NSLayoutConstraint:0xac43680 V:[UIView:0xac4d0f0(1)]>",
        "<NSLayoutConstraint:0xac436b0 V:[UIView:0xac4d0f0]-(0)-|   (Names: '|':UITableViewCellContentView:0xd93e850 )>",
        "<NSAutoresizingMaskLayoutConstraint:0xac6b120 h=--& v=--& V:[UITableViewCellContentView:0xd93e850(44)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0xac43650 V:[UIImageView:0xac47f50]-(>=0)-[UIView:0xac4d0f0]>

列表中有一个我不想要的限制:

"<NSAutoresizingMaskLayoutConstraint:0xac6b120 h=--& v=--& V:[UITableViewCellContentView:0xd93e850(44)]>"

and I cannot set the translatesAutoresizingMaskIntoConstraints property of the contentView to NO => it would mess up the entire cell.

44是默认的单元格高度，但是我在表视图委托中定义了我的自定义高度，那么为什么单元格contentView有这个约束呢？是什么导致了这一切？

在iOS6中，它不会发生，在iOS6和iOS7上，一切看起来都很好.

我的代码很大，所以我不会把它贴在这里，但如果你需要的话，可以随意索要一个粘贴箱.

要指定我是如何做到这一点的，请参见单元初始化:

• 我创建我所有的标签、按钮等
• 我将他们的translatesAutoresizingMaskIntoConstraints属性设置为NO
• 我将它们添加为单元格contentView的子视图
• 我在contentView号车上添加了限制条件

我也非常想了解为什么这种情况只发生在iOS7上.