尝试加载xib文件时无法同时满足约束

Question

我正在尝试使用xib文件实现UITableView，但是当我运行该应用程序时，出现以下错误，并且xib在iPhone4s这样的小屏幕上正确显示
在较大的显示尺寸下可以正常工作。

xib的屏幕截图

任何帮助将不胜感激

错误

    2016-12-14 17:12:41.826 FoodStrock[5776:1761262] 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. 
(
    "<NSLayoutConstraint:0x7fcc2a6dfac0 V:[UIImageView:0x7fcc2a6e1010(63)]>",
    "<NSLayoutConstraint:0x7fcc2a617530 V:[UIImageView:0x7fcc2a6e1010]-(8)-|   (Names: '|':UITableViewCellContentView:0x7fcc2a6e1270 )>",
    "<NSLayoutConstraint:0x7fcc2a6cc3b0 V:|-(9)-[UIImageView:0x7fcc2a6e1010]   (Names: '|':UITableViewCellContentView:0x7fcc2a6e1270 )>",
    "<NSLayoutConstraint:0x7fcc2a4955a0 'UIView-Encapsulated-Layout-Height' V:[UITableViewCellContentView:0x7fcc2a6e1270(59.6667)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7fcc2a6dfac0 V:[UIImageView:0x7fcc2a6e1010(63)]>

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.
2016-12-14 17:12:41.827 FoodStrock[5776:1761262] 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. 
(
    "<NSLayoutConstraint:0x7fcc2a6a69d0 V:[UILabel:0x7fcc2a6e1670'Address'(63)]>",
    "<NSLayoutConstraint:0x7fcc2a693820 UILabel:0x7fcc2a6e1670'Address'.bottom == UITableViewCellContentView:0x7fcc2a6e1270.bottomMargin>",
    "<NSLayoutConstraint:0x7fcc2a6e0c00 UILabel:0x7fcc2a6e1670'Address'.top == UITableViewCellContentView:0x7fcc2a6e1270.topMargin + 1>",
    "<NSLayoutConstraint:0x7fcc2a4955a0 'UIView-Encapsulated-Layout-Height' V:[UITableViewCellContentView:0x7fcc2a6e1270(59.6667)]>"
)

Answer 1

将您的UIImageView，UILabel，UIButton放在单个UIView中（即mainView）。 现在mainView约束将位于xib视图（superView）的顶部，底部，顶部，底部。 现在，UIImageView，UILabel和UIButton的约束已根据您的要求与mainView一起使用。

注意：尽量减少对UIComponent的约束，但请记住，它完全可以满足您的要求。 像这里，给这样的约束：

1. UIImage：top，bottom，前导wrt mainView和恒定宽度，或者您可以将容器的水平中心，前导，高度，宽度指定为中心。

2. UIButton：顶部，底部，尾随wrt mainView和恒定宽度，也可以将容器的水平居中位置，行距，高度，宽度给定。

3. UILabel：将尾随且水平居中放置到容器就足够了，但是您也可以指定高度。 UILabel可以根据您只需要指定x和y坐标的文本字体大小自动获取高度和宽度。