iOS分页控件(导航) [英] iOS Paging Controls (Navigation)

问题描述

有没有办法可以在我的应用中独立使用这些分页点，

Is there a way that I can use those paging dots independently in my app,

将它们添加到我的UIView/NIB并调用其上的函数以设置点总数或当前页面/点.

add them to my UIView/NIB and call the functions on it to set total number of dots or current page/dot.

基本上，我将UIViewImage保存在nib文件中，我正在以滑动手势显示图像(取自数组的名称)，并希望在底部显示这些分页点以获取导航信息.

Basically I've UIViewImage in a nib file, i'm displaying images (names taken off an array) on swipe gestures and want to show those paging dots on the bottom for the navigation information.

推荐答案

UIPageControl 的总页面数&正如您所描述的那样，假设 pageControl 是 UIPageControl 的实例，那么您可以启动 numberOfPages & currentPage 如下:

UIPageControl has it's total page & current page/dot just as you described, let's say pageControl is a instance of UIPageControl, then you can initiate the numberOfPages & currentPage as below:

pageControl.numberOfPages = [images count];
pageControl.currentPage = 0;

此外，您可以在点击 pageControl 的点时为其添加操作. changePage:方法仅是示例:

Also, you can add action for it when the pageControl's dots was tapped. changePage: method here is just a example:

[pageControl addTarget:self action:@selector(changePage:) forControlEvents:UIControlEventValueChanged];

您可以将图像添加到 UIScrollView 并使用其委托方法: scrollViewDidScroll::

You can add your images to a UIScrollView and use its delegate method: scrollViewDidScroll::

- (void)scrollViewDidScroll:(UIScrollView *)sender {
    // Update the page number
    CGFloat pageWidth = scrollView.frame.size.width;
    pageControl.currentPage = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
}

当您滑动到新图像时，它将更改 pageControl 的当前点.

It'll change the pageControl's current dot when your swiped to a new image.

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