变更记录

方案名称

UIPageControl - 翻页显示的实现

关键字

UIPageControl \ 翻页 \ UIScrollView

需求场景

1. 需要实现 UIScrollView 翻页显示并显示页码标签时

参考链接

（无）

详细内容

1. Swift 版本

func scrollViewDidScroll(scrollView: UIScrollView) {
    self.resetPageControl()
}

func resetPageControl()
{
    var iPages : NSInteger = NSInteger(self.scrollViewAttachments.contentSize.width / self.scrollViewAttachments.frame.size.width)
    var iPage : NSInteger = NSInteger(self.scrollViewAttachments.contentOffset.x / self.scrollViewAttachments.frame.size.width)
    self.pageControlItem.numberOfPages = iPages
    self.pageControlItem.currentPage = iPage
}

2. Objective-C 版本

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    [self resetPageControl];
}

-(void)resetPageControl
{
    NSInteger iPages = self.scrollViewMain.contentSize.width / self.scrollViewMain.frame.size.width;
    NSInteger iPage = self.scrollViewMain.contentOffset.x / self.scrollViewMain.frame.size.width;
    self.pageControlItem.numberOfPages = iPages;
    self.pageControlItem.currentPage = iPage;
}

3. UIScrollView 添加页面显示元素实现示例

func setUpAttachments(attachmens : NSArray)
{
    let pages = CGFloat(ceil(Double(CGFloat(attachmens.count) / 4.0))) //向上取整计算页总数
    self.scrollViewAttachments.contentSize = CGSizeMake(CGFloat((CGFloat(WIDTHSCREEN - 10.0)) * pages), 100.0)

    for obj in attachmens
    {
        var aAttachment : AuctionAttachment = obj as AuctionAttachment
        var aItemView : REXAttachmentView = REXAttachmentView.loadFromNibNamed("REXAttachmentView", bundle: nil) as REXAttachmentView
        aItemView.aAttachment = aAttachment
        self.scrollViewAttachments.addSubview(aItemView)
        aItemView.frame = CGRectMake((WIDTHSCREEN - 10.0) / 4.0 * CGFloat(attachmens.indexOfObject(aAttachment)), 0, (WIDTHSCREEN - 10.0) / 4.0, 100.0)
        aItemView.setUpView(aAttachment)
        aItemView.delegate = self
    }

    resetPageControl()
}

效果图

（无）

备注

（无）