07 - collectionView滚到indexPath指定Cell

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error: collectionView滚到indexPath指定Cell 程序崩溃

NSInvalidArgumentException' : attempt to scroll to invalid index path

objective-c 实现

 [self.collectionView scrollToItemAtIndexPath:indexPath atScrollPosition:Left
                              animated:NO];

swift 实现

collectionView.scrollToItemAtIndexPath(indexPath!, atScrollPosition: .Left,animated: false)

fix - BUG: 检查collectionView有无设置完毕(检查代码顺序)

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