如何在一个UIScrollView非滚动内容 [英] How to have non scrolling content in a UIScrollView

问题描述

我需要像这样

+ scrollview
|
|__ moving content
|
|__ non moving content

棘手的部分是我在修改现有的一块code的，我不能使用
父滚动视图设置不可移动的内容，因为它的孩子。非移动内容
必须是一个滚动视图的孩子。我想将其连接到后台视图，但
我不知道如何访问UIScrollView的背景视图。

The tricky part is that I'm modifying an existing piece of code where I can't use the scrollview parent to set the "non moving content" as it's child. The non moving content must be a scrollview child. I was thinking of attaching it to the background view but I don't know how to access the UIScrollview's background view.

推荐答案

我相信推荐的方式做到这一点是重写layoutSubviews在自定义UIScrollView的子类。这是在2010年的WWDC会议上覆盖（IIRC），你应该能够得到，如果你是一个开发者计划的成员。

I believe the "recommended" way to do this is to override layoutSubviews in a custom UIScrollView subclass. This was covered (IIRC) in a 2010 WWDC session you ought to be able to get if you are a developer program member.

假设你不能子类UIScrollView的，你可以这样做以下（在修改现有的code给你的限制）。

Assuming you can't subclass UIScrollView (given your restrictions on modifying existing code), you can do something like the following.

让staticView是非移动内容您想保留固定的：

Let "staticView" be the "non moving content" you wish to keep fixed:

UIView *staticView;

创建伊娃（可能在您的视图控制器），以保持其初始中心：

Create an ivar (probably in your view controller) to hold its initial center:

CGPoint staticViewDefaultCenter = [staticView center]; // Say, in viewDidLoad

请您的视图控制器滚动视图的委托，如果尚未，然后实现类似如下：

Make your view controller the scroll view's delegate if it isn't already, then implement something like the following:

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    CGPoint contentOffset = [scrollView contentOffset];
    CGPoint newCenter = CGPointMake(staticViewDefaultCenter.x + contentOffset.x,
                                    staticViewDefaultCenter.y + contentOffset.y);
    [staticView setCenter:newCenter];
 }

这将涵盖滚动视图的简单情况。处理可缩放视图变得有点棘手，将部分取决于你如何执行你的viewForZoomingInScrollView：方法，但遵循的类似方法（​​这一次是在scrollViewDidZoom：当然）。

This will cover the simple case of a scrollable view. Handling a zoomable view gets a little trickier and will depend in part on how you have implemented your viewForZoomingInScrollView: method, but follows an analogous procedure (this time in scrollViewDidZoom: of course).

我没有通过有你staticView变换的含义想 - 你可能必须做在这种情况下一些操作太

I haven't thought through the implications of having a transform on your staticView - you may have to do some manipulations in that case too.

这篇关于如何在一个UIScrollView非滚动内容的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！