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1. NSIndexPath *indexPath = [NSIndexPath indexPathForRow:1 inSection:0]; [collectionView scrollToItemAtIndexPath:indexPath atScrollPosition:UICollectionViewScrollPositionTop animated:true]; 2. [_collectionViewsetContentOffset:CGPointMake(0,0)animated:NO];
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參考：
https://blog.csdn.net/saw471/article/details/53894174?utm_source=blogxgwz6
https://www.jianshu.com/p/c3b84f3bd56b?utm_campaign=maleskine&utm_content=note&utm_medium=seo_notes&utm_source=recommendation