尝试加载 xib 文件时无法同时满足约束

Posted 2023-03-15

【中文标题】尝试加载 xib 文件时无法同时满足约束

【英文标题】：Unable to simultaneously satisfy constraints When trying to load xib file

【发布时间】：2016-12-14 11:50:53

【问题描述】：

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，我收到以下错误，并且 xib 在 iPhone4s 等小屏幕中正确显示 它适用于较大的显示尺寸。

Screenshot of xib

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)]>"
)

【问题讨论】：

正确检查您的约束。该错误是由于额外的限制而发生的。检查每个约束并删除不必要的约束。

【参考方案1】：

将你的 UIImageView 、 UILabel 、 UIButton 放在单个 UIView 中（比如 mainView）。现在 mainView 约束将是 xib 视图（superView）的前导、尾随、顶部底部。现在 UIImageView ， UILabel ， UIButton 的约束是根据您的要求 w.r.t.主视图。

注意：尽可能减少对 UIComponents 的约束，但请注意它完全满足您的要求。像这里一样，给出这样的约束：

UIImage : top, bottom , Leading wrt mainView and constant width 或者你可以给容器水平居中，前导，高度，宽度。

UIButton : top, bottom, trailing wrt mainView 和固定宽度，或者你可以给容器水平居中，前导，高度，宽度。

UILabel : 前导尾随和水平居中到容器就足够了，但你也可以给出高度。 UILabel 可以根据你只需要指定x和y坐标的文字字体大小自动取高宽。

【讨论】：

感谢 Tinu 的帮助，但我在 xib 文件中找不到 UIView

老兄，你必须添加新的 UIView，在故事板的右下方，拖放它。然后将所有组件放入其中，然后使用它。