获取当前页面 [英] Getting the current page

问题描述

在我的滚动视图中，我想获取正在显示的当前页面（也许页面不是正确的术语）。我找不到任何保存这个变量。但我认为它必须在某个地方，因为指标能够显示当前正在显示滚动视图的哪个子视图。

这完全隐藏了我们

$ c>属性为当前页。您可以使用以下方法计算：

  int page = scrollView.contentOffset.x / scrollView.frame.size.width; 
  

如果要向上舍入或向下舍入到最近的页面，请使用：

  CGFloat width = scrollView.frame.size.width; 
 NSInteger page =（scrollView.contentOffset.x +（0.5f * width））/ width; 
  

In my scroll view, I want to get the current page that's being displayed (maybe page isn't the correct term). I can't find any variable that holds this. But I think it must be held somewhere, since the indicator is able to show which sub-view of the scroll view is currently being displayed.

Is this hidden from us completely or is there a way for me to access it?

解决方案

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;

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