uiscrollview

Check if a UIScrollView reached the top or bottom

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Implement the UIScrollViewDelegate in your class, and then add this: -(void)scrollViewDidScroll: (UIScrollView*)scrollView { float scrollViewHeight = scrollView.frame.size.height; float scrollContentSizeHeight = scrollView.contentSize.height; float scrollOffset = scrollView.contentOffset.y; if (scrollOffset == 0) { // then we are at the top } else if (scrollOffset + scrollViewHeight == scrollContentSizeHeight) { // then we are at the end } } … Read more

Paging UIScrollView in increments smaller than frame size

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Try making your scrollview less than the size of the screen (width-wise), but uncheck the “Clip Subviews” checkbox in IB. Then, overlay a transparent, userInteractionEnabled = NO view on top of it (at full width), which overrides hitTest:withEvent: to return your scroll view. That should give you what you’re looking for. See this answer for … Read more

How to Make the scroll of a TableView inside ScrollView behave naturally

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The solution to simultaneously handling the scroll view and the table view revolves around the UIScrollViewDelegate. Therefore, have your view controller conform to that protocol: class ViewController: UIViewController, UIScrollViewDelegate { I’ll represent the scroll view and table view as outlets: @IBOutlet weak var scrollView: UIScrollView! @IBOutlet weak var tableView: UITableView! We’ll also need to track … Read more

UIScrollView: paging horizontally, scrolling vertically?

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You’re in a very tough situation, I must say. Note that you need to use a UIScrollView with pagingEnabled=YES to switch between pages, but you need pagingEnabled=NO to scroll vertically. There are 2 possible strategies. I don’t know which one will work / is easier to implement, so try both. First: nested UIScrollViews. Frankly, I’m … Read more

How to disable horizontal scrolling of UIScrollView?

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You have to set the contentSize property of the UIScrollView. For example, if your UIScrollView is 320 pixels wide (the width of the screen), then you could do this: CGSize scrollableSize = CGSizeMake(320, myScrollableHeight); [myScrollView setContentSize:scrollableSize]; The UIScrollView will then only scroll vertically, because it can already display everything horizontally.

Getting the current page

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There is no UIScrollView property for the current page. You can calculate it with: int page = scrollView.contentOffset.x / scrollView.frame.size.width; If you want to round up or down to the nearest page, use: CGFloat width = scrollView.frame.size.width; NSInteger page = (scrollView.contentOffset.x + (0.5f * width)) / width;