iOS报错日志- collectionview

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*** Assertion failure in -[UICollectionView _createPreparedSupplementaryViewForElementOfKind:atIndexPath:withLayoutAttributes:applyAttributes:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-3512.29.5/UICollectionView.m:1536

collectionviewcontroller.view在原大小的controller中正常显示, 在一个较小的controller.view中作为子view加载时报以上错误

UICollectionViewFlowLayout *flowLayout=[[UICollectionViewFlowLayoutalloc] init];

flowLayout.headerReferenceSize =CGSizeMake(self.view.bounds.size.width,50);

错误定位到这个地方

解决:

[selfaddChildViewController:self.collectionViewCntr];

self.collectionViewCntr.view.frame =CGRectMake(0,0, SCREENWIDTH,self.view.bounds.size.height);

[self.viewaddSubview:self.collectionViewCntr.view];

collectionviewcontroller需要作为子控制器添加,再添加其view,原因不清楚

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