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2014/10/15 ¤U¤È 10:05:31

iphone Programming Glossary: contentoffset

Dynamically setting layout on UICollectionView causes inexplicable contentOffset change

http://stackoverflow.com/questions/13780138/dynamically-setting-layout-on-uicollectionview-causes-inexplicable-contentoffset

setting layout on UICollectionView causes inexplicable contentOffset change According to Apple's documentation and touted at WWDC 2012 it is possible to set the layout on UICollectionView.. instead. However in practice I've found that UICollectionView makes inexplicable and even invalid changes to the contentOffset causing cells to move incorrectly making the feature virtually unusable. To illustrate the problem I put together the following.. return cell void collectionView UICollectionView collectionView didSelectItemAtIndexPath NSIndexPath indexPath NSLog @ contentOffset f f self.collectionView.contentOffset.x self.collectionView.contentOffset.y self.collectionView setCollectionViewLayout..

UIScrollView. Any thoughts on implementing “infinite” scroll/zoom?

http://stackoverflow.com/questions/1493950/uiscrollview-any-thoughts-on-implementing-infinite-scroll-zoom

any edge update the content of the view with a new set of content offset appropriately and reset the scroll view's contentOffset property to be back in the middle. Handling zooming do something similar only this time watch the zoom factor on the scroll..

UIScrollView Infinite Scrolling

http://stackoverflow.com/questions/3430267/uiscrollview-infinite-scrolling

with infinite horizontal scrolling. Scrolling forward is easy I have implemented scrollViewDidScroll and when the contentOffset gets near the end I make the scrollview contentsize bigger and add more data into the space i'll have to deal with the crippling.. contentsize bigger move the existing content along add the new data to the beginning and then importantly adjust the contentOffset so the data under the view port stays the same. This works perfectly if I scroll slowly or enable paging but if I go fast.. even very fast it goes mad Heres the code void scrollViewDidScroll UIScrollView scrollView float pageNumber scrollView.contentOffset.x 320 float pageCount scrollView.contentSize.width 320 if pageNumber pageCount 4 Add 10 new pages to end mainScrollView.contentSize..

How to detect touches in status bar

http://stackoverflow.com/questions/3753097/how-to-detect-touches-in-status-bar

Maybe hide it or place it below some other view etc. Set it's contentSize to be larger than the bounds Set a non zero contentOffset In your controller implement a delegate of the scrollview like shown below. By always returning NO the scroll view never..

Keep uitableview static when inserting rows at the top

http://stackoverflow.com/questions/4279730/keep-uitableview-static-when-inserting-rows-at-the-top

in which you can by some means calculate how much the table view is pushed down and offset that by setting contentOffset . This is a simplest sample code to handle the simplest situation where all insertions happen at the top of table view @implementation.. if CGSizeEqualToSize self.contentSize CGSizeZero if contentSize.height self.contentSize.height CGPoint offset self.contentOffset offset.y contentSize.height self.contentSize.height self.contentOffset offset super setContentSize contentSize @end share..

Horizontal UIScrollView and hundreds of thumbnail images in iOS?

http://stackoverflow.com/questions/5973883/horizontal-uiscrollview-and-hundreds-of-thumbnail-images-in-ios

programatically to your scrollview and use the setContentSize method of UIScrollView. you have to pass 2 values in contentOffset. 1 for width and 1 for height. Please follow link to explore more on this. If you need further help please leave a comment...

Change Default Scrolling Behavior of UITableView Section Header

http://stackoverflow.com/questions/664781/change-default-scrolling-behavior-of-uitableview-section-header

Thanks. iphone cocoa touch uitableview share improve this question The way I solved this problem is to adjust the contentOffset according to the contentInset in the UITableViewControllerDelegate extends UIScrollViewDelegate like this void scrollViewDidScroll.. like this void scrollViewDidScroll UIScrollView scrollView CGFloat sectionHeaderHeight 40 if scrollView.contentOffset.y sectionHeaderHeight scrollView.contentOffset.y 0 scrollView.contentInset UIEdgeInsetsMake scrollView.contentOffset.y 0.. UIScrollView scrollView CGFloat sectionHeaderHeight 40 if scrollView.contentOffset.y sectionHeaderHeight scrollView.contentOffset.y 0 scrollView.contentInset UIEdgeInsetsMake scrollView.contentOffset.y 0 0 0 else if scrollView.contentOffset.y sectionHeaderHeight..

UIScrollView : paging horizontally, scrolling vertically?

http://stackoverflow.com/questions/728014/uiscrollview-paging-horizontally-scrolling-vertically

the fly from your scrollViewDidScroll delegate method. To prevent diagonal scrolling you should first try remembering contentOffset in scrollViewWillBeginDragging and checking and resetting contentOffset inside scrollViewDidScroll if you detect a diagonal.. scrolling you should first try remembering contentOffset in scrollViewWillBeginDragging and checking and resetting contentOffset inside scrollViewDidScroll if you detect a diagonal movement. Another strategy to try is to reset contentSize to only enable.. which direction the user's finger is going. UIScrollView seems pretty forgiving about fiddling with contentSize and contentOffset from its delegate methods. If that does not work either or results in sloppy visuals you have to override touchesBegan touchesMoved..