Question

我在故事板中编写了一个简单的自定义UICollectionViewCell，我也以编程方式完成了相同的结果。

它有一个单数UIImageView和两个UILabels，如下所示：

          <--UIIMAGEVIEW-->          <--UILABEL-------->
|-(10px)- |               | -(10px)-                     -(10px)-|
          <--------------->          <--UILABEL-------->

图像位于左侧，然后右侧是两个上下标签。

每个间隔有10个像素间隙，并且全部以细胞Y轴为中心。然后标签有一个常数来偏离中心（向上和向下）。

图像的高度和宽度固定为44像素，标签的固定高度为20像素（宽度灵活）。

约束按预期工作并且永远不会破坏应用程序，但它们总是在下面吐出这个令人讨厌的控制台日志信息，因为它们显然已经破坏了。

如果我将此行添加到我的UICollectionViewCell子类中，则约束不再中断并吐出控制台错误，但它们在屏幕上完全被破坏。

[self.contentView setTranslatesAutoresizingMaskIntoConstraints:NO];

任何线索？这看起来很不合逻辑！

以下是控制台错误代码：

2014-10-25 18:28:14.273 Air Plan[1579:580797] 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:0x17009edc0 H:[UIImageView:0x1701f7d00(44)]>",
    "<NSLayoutConstraint:0x17009f130 H:|-(10)-[UIImageView:0x1701f7d00]   (Names: '|':UIView:0x170183810 )>",
    "<NSLayoutConstraint:0x17009f270 H:[UIImageView:0x1701f7d00]-(10)-[UILabel:0x155e59970'detailLbl']>",
    "<NSLayoutConstraint:0x17009f310 H:[UILabel:0x155e59970'detailLbl']-(10)-|   (Names: '|':UIView:0x170183810 )>",
    "<NSAutoresizingMaskLayoutConstraint:0x17409eff0 h=--& v=--& H:[UIView:0x170183810(50)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x17009edc0 H:[UIImageView:0x1701f7d00(44)]>

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.
2014-10-25 18:28:14.276 Air Plan[1579:580797] 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:0x17009fcc0 H:[UIImageView:0x1701fa800(44)]>",
    "<NSLayoutConstraint:0x17009ff40 H:|-(10)-[UIImageView:0x1701fa800]   (Names: '|':UIView:0x170180a90 )>",
    "<NSLayoutConstraint:0x1702800a0 H:[UIImageView:0x1701fa800]-(10)-[UILabel:0x155e5b440'detailLbl']>",
    "<NSLayoutConstraint:0x170280140 H:[UILabel:0x155e5b440'detailLbl']-(10)-|   (Names: '|':UIView:0x170180a90 )>",
    "<NSAutoresizingMaskLayoutConstraint:0x17409ea00 h=--& v=--& H:[UIView:0x170180a90(50)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x17009fcc0 H:[UIImageView:0x1701fa800(44)]>

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.
2014-10-25 18:28:14.278 Air Plan[1579:580797] 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:0x170280a00 H:[UIImageView:0x1701fab00(44)]>",
    "<NSLayoutConstraint:0x170280c80 H:|-(10)-[UIImageView:0x1701fab00]   (Names: '|':UIView:0x1701822f0 )>",
    "<NSLayoutConstraint:0x170280dc0 H:[UIImageView:0x1701fab00]-(10)-[UILabel:0x155e5cd10'detailLbl']>",
    "<NSLayoutConstraint:0x170280e60 H:[UILabel:0x155e5cd10'detailLbl']-(10)-|   (Names: '|':UIView:0x1701822f0 )>",
    "<NSAutoresizingMaskLayoutConstraint:0x17409f180 h=--& v=--& H:[UIView:0x1701822f0(50)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x170280a00 H:[UIImageView:0x1701fab00(44)]>

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.
2014-10-25 18:28:14.280 Air Plan[1579:580797] 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:0x170281090 H:[UIImageView:0x1701fae00(44)]>",
    "<NSLayoutConstraint:0x170281310 H:|-(10)-[UIImageView:0x1701fae00]   (Names: '|':UIView:0x170182220 )>",
    "<NSLayoutConstraint:0x1702813b0 H:[UIImageView:0x1701fae00]-(10)-[UILabel:0x155e5d620'titleLbl']>",
    "<NSLayoutConstraint:0x170281400 H:[UILabel:0x155e5d620'titleLbl']-(10)-|   (Names: '|':UIView:0x170182220 )>",
    "<NSAutoresizingMaskLayoutConstraint:0x17409fd60 h=--& v=--& H:[UIView:0x170182220(50)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x170281090 H:[UIImageView:0x1701fae00(44)]>

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.
2014-10-25 18:28:14.282 Air Plan[1579:580797] 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:0x170281b80 H:[UIImageView:0x1701fb100(44)]>",
    "<NSLayoutConstraint:0x17409f4a0 H:|-(10)-[UIImageView:0x1701fb100]   (Names: '|':UIView:0x170182150 )>",
    "<NSLayoutConstraint:0x17409f5e0 H:[UIImageView:0x1701fb100]-(10)-[UILabel:0x155d64210'detailLbl']>",
    "<NSLayoutConstraint:0x17409f680 H:[UILabel:0x155d64210'detailLbl']-(10)-|   (Names: '|':UIView:0x170182150 )>",
    "<NSAutoresizingMaskLayoutConstraint:0x1742800f0 h=--& v=--& H:[UIView:0x170182150(50)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x170281b80 H:[UIImageView:0x1701fb100(44)]>

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.

Answer 1

我也遇到了这个问题并通过在UICollectionViewCell子类中添加它来修复它：

SWIFT 3

override func awakeFromNib() {
    contentView.autoresizingMask = [UIViewAutoresizing.flexibleWidth, UIViewAutoresizing.flexibleHeight]
}

<强> OBJC

- (void)awakeFromNib{
    self.contentView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
}

Xcode 6.1 iOS 8.0.2,8.1

您还可以查看以下答案：UICollectionView Cell + UiLabel with AutoLayout

Answer 2

创建后的单元格和单元格的内容视图为50x50（与集合布局设置的大小无关）。

自动布局首次在单元格大小正确但内容视图仍为50x50后有效。可能是iOS 8问题。其他布局使用正确的内容视图大小。如此精细，您会看到正确的布局，但是日志输出会乱七八糟。

只需在awakeFromNib中设置任何大于最小单元格大小的帧到iOS 8的内容视图。

在你的情况下

|-(10px)-UIImageView(44px)-(10px)-UILabel-(10px)-|

最小单元格宽度为74 - 所有显式常量的总和。

- (void)awakeFromNib {
    [super awakeFromNib];
    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.) {
        self.contentView.frame = CGRectMake(0, 0, 200, 100);
    }
}

有同样的问题，但设置auoresizingMask不起作用。设置框架解决了这个问题。

Answer 3

我也有这个问题。添加：

[self.contentView setTranslatesAutoresizingMaskIntoConstraints:NO];

打破了我的观点布局。在我的情况下，我不得不调整一些布局约束，以使视图恢复到我想要的方式。在一种情况下，图像不是垂直居中的，因为细胞的高度未被充分约束。（在那里，我为单元格中的最低元素添加了一个底部约束）。在另一种情况下，另一个图像（在不同的单元格中）没有居中，我不得不做出不同的约束更改。我在该图像上添加了一个高度约束，并删除了一个顶部约束，解决了这个问题。

我在这两个UILabel s的单元格中也遇到了问题，这些单元格不再受限于集合视图单元格的宽度。也就是说，当文本太长时，文本就不能很好地跟踪＆＃34; ...＆＃34;在单元格内，它只会超过单元格的末尾。在这两种情况下，我唯一可以想到的解决方法是在标签上添加固定宽度约束，从而使标签的宽度不具有自适应性。在将translatesAutoresizingMaskIntoConstraints设置为NO之前，先前存在拖尾限制。

UICollectionViewCell自动布局

3 个答案: