UICollectionView cellForItemAtIndexPath not called
解决办法：
self.automaticallyAdjustsScrollViewInsets = NO;//解决cellForItemAtIndexPath not called问题
我也不是很清楚原因，怕说不好，读者自己理解吧
UICollectionView cellForItemAtIndexPath not called,布布扣,bubuko.com
UICollectionView cellForItemAtIndexPath not called
原文地址：http://www.cnblogs.com/MartinLi841538513/p/3905667.html
