ios – 集合视图上的奇怪的自动布局行为

refreshCatalogue[31754:16177989] 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:0x7fa98103b740 V:[UIImageView:0x7fa9810375d0]-(0)-|   (Names: '|':UIView:0x7fa9810371d0 )>","<NSLayoutConsTraint:0x7fa98103b7e0 V:|-(0)-[UIImageView:0x7fa9810375d0]   (Names: '|':UIView:0x7fa9810371d0 )>","<NSLayoutConsTraint:0x7fa98103b8d0 UIImageView:0x7fa9810375d0.centerY == UIImageView:0x7fa981037490.centerY>","<NSLayoutConsTraint:0x7fa98103ba60 UIImageView:0x7fa981037490.top == UIView:0x7fa9810371d0.topMargin + 71>","<NSAutoresizingMaskLayoutConsTraint:0x7fa980d44a10 h=--& v=--& V:[UIView:0x7fa9810371d0(50)]>"
)

Will attempt to recover by breaking consTraint 
<NSLayoutConsTraint:0x7fa98103b8d0 UIImageView:0x7fa9810375d0.centerY == UIImageView:0x7fa981037490.centerY>

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.

问题是如果我这样做：

[self.collectionView reloadItemsATindexPaths:@[indexPath]];

没有什么显示甚至图像视图似乎有正确的框架,图像属性设置.
如果我重新加载整个集合视图：

[self.collectionView reloadData];

错误仍然存​​在,但图像显示.代码在这里开放,任何人都有兴趣看看：
https://github.com/Ridiculous-Innovations/RefreshCatalogue

此外,故事板中的所有限制似乎都是蓝色的.任何想法可能导致这个问题？

编辑：不用说,所有的元素,包括图像视图在正确的地方(我做了调试框架和设置随机颜色),但图像没有显示,直到刷新…有时,单元格根本不显示