使用NSLayoutConstraint出错

Question

我有2 storyBoards。第一个是一个名为“tableViewController”的st1，它有带有5个标签、5个textFields和2个按钮的静态单元格。下一个storyBoard -一个名为"st2“的viewController有一个tableView。

当我从st1到st2时，它会给出下面的错误。

我使用的是尺寸类和自动布局。

2015-01-18 13:10:40.199 myApp[1108:35975] 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:0x7fa1f1d2a310 V:[UITextField:0x7fa1f1d283c0(30)]>",

    "<NSLayoutConstraint:0x7fa1f1d30780 UITextField:0x7fa1f1d283c0.top == UITableViewCellContentView:0x7fa1f1d271a0.topMargin>",

    "<NSLayoutConstraint:0x7fa1f1d30870 UITableViewCellContentView:0x7fa1f1d271a0.bottomMargin == UITextField:0x7fa1f1d283c0.bottom - 3>",

    "<NSLayoutConstraint:0x7fa1f1d64d00 'UIView-Encapsulated-Layout-Height' V:[UITableViewCellContentView:0x7fa1f1d271a0(43.5)]>"

)



Will attempt to recover by breaking constraint 



Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.

The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.

它会显示此错误5次。我把它剪掉这样就更容易读懂了。

我是个初学者，你可能知道，所以请不要对我太苛刻。

Answer 1

它看起来像是在抱怨，因为您已经将文本字段的高度限制为30 (即第一个约束中的'(30)‘)，但您也希望在其单元格的上边缘设置文本字段的顶部，在单元格的底部边缘设置底部，而单元格的高度为43.5。因此，您同时要求文本字段的高度为30和40.5，这是一个冲突。

要么约束文本字段的顶部和底部，而不设置高度

或

设置高度，不要设置底部约束

或

调整单元格的高度(可能不是最佳解决方案)