UIScrollView 自定义分页大小 [英] UIScrollView custom paging size

问题描述

UIScrollView 中的分页是一个很棒的功能，我在这里需要的是将分页设置为更小的距离，例如我希望我的 UIScrollView 分页小于 UIScrollView 框架宽度的大小.谢谢

paging in UIScrollView is a great feature, what I need here is to set the paging to a smaller distance, for example I want my UIScrollView to page less size that the UIScrollView frame width. Thanks

推荐答案

有一个 UIScrollView 委托方法可以使用.将您的类设置为滚动视图的委托，然后实现以下内容:

There is a UIScrollView delegate method you can use. Set your class as the scroll view's delegate, and then implement the following:

- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset
{
    CGFloat kMaxIndex = 23;
    CGFloat targetX = scrollView.contentOffset.x + velocity.x * 60.0;
    CGFloat targetIndex = 0.0;
    if (velocity.x > 0) {
        targetIndex = ceil(targetX / (kCellWidth + kCellSpacing));
    } else if (velocity.x == 0) {
        targetIndex = round(targetX / (kCellWidth + kCellSpacing));
    } else if (velocity.x < 0) {
        targetIndex = floor(targetX / (kCellWidth + kCellSpacing));
    }
    if (targetIndex < 0)
        targetIndex = 0;
    if (targetIndex > kMaxIndex)
        targetIndex = kMaxIndex;
    targetContentOffset->x = targetIndex * (kCellWidth + kCellSpacing);
    //scrollView.decelerationRate = UIScrollViewDecelerationRateFast;//uncomment this for faster paging
}

速度参数对于确保滚动感觉自然并且在手指仍在移动的情况下触摸结束时不会突然结束是必要的.单元格宽度和单元格间距是视图中页面的页面宽度和间距.在本例中，我使用的是 UICollectionView.

The velocity parameter is necessary to make sure the scrolling feels natural and doesn't end abruptly when a touch ends with your finger still moving. The cell width and cell spacing are the page width and spacing between pages in your view. In this case, I'm using a UICollectionView.

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