我想滚动到集合视图的页脚或标题视图,但是,scrollToItemAtIndexPath的标准方法仅滚动到单元格
- (void)scrollToBottom {
NSInteger section = [self numberOfSectionsInCollectionView:self.collectionView] - 1;
NSInteger item = [self collectionView:self.collectionView numberOfItemsInSection:section] - 1;
if ((section > 0) && (item > 0)) {
NSIndexPath * lastIndexPath = [NSIndexPath indexPathForItem:item inSection:section];
[self.collectionView scrollToItemAtIndexPath:lastIndexPath atScrollPosition:UICollectionViewScrollPositionBottom animated:NO];
}
}
如何滚动到任何页脚,标题视图,类似于滚动到单元格？
解决方法
我知道这是一个老问题,但我最近遇到了同样的问题.我找到的最好的解决方案是来自Gene De Lisa的
http://www.rockhoppertech.com/blog/scroll-to-uicollectionview-header/,因为你似乎在Obj-C工作,这里是我使用的Swift代码的端口：
-(void) scrollToSectionHeader:(int)section {
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:section];
UICollectionViewLayoutAttributes *attribs = [self.collectionView layoutAttributesForSupplementaryElementOfKind:UICollectionElementKindSectionHeader atIndexPath:indexPath];
CGPoint topOfHeader = CGPointMake(0,attribs.frame.origin.y - self.collectionView.contentInset.top);
[self.collectionView setContentOffset:topOfHeader animated:YES];
}
上面的代码将正确滚动到给定部分的标题(我需要的全部).修改它以滚动到页脚是很简单的：
-(void) scrollToSectionFooter:(int)section {
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:section];
UICollectionViewLayoutAttributes *attribs = [self.collectionView layoutAttributesForSupplementaryElementOfKind:UICollectionElementKindSectionFooter atIndexPath:indexPath];
CGPoint topOfFooter = CGPointMake(0,attribs.frame.origin.y - self.collectionView.contentInset.top);
[self.collectionView setContentOffset:topOfFooter animated:YES];
}
