如何为 UIScrollView 启用方向锁定?

问题描述

我有一个 UIScrollView，里面有一个 UIView.我想锁定 x 轴，以便视图仅垂直滚动.如何启用定向锁定?

I have a UIScrollView with a UIView inside. I want to lock the x-axis so that the view is only scrolled vertically. How do I enable directional locking?

推荐答案

首先，设置UIScrollView的contentSize的宽度等于或小于UIScrollView 框架的宽度.

First, set the UIScrollView's contentSize to have a width that is equal to or less than the width of the UIScrollView's frame.

接下来，将 UIScrollView's alwaysBounceHorizo​​ntal 设置为 NO.这将防止滚动视图出现橡皮筋"，即使您告诉它没有更多的水平内容要显示.

Next, set UIScrollView's alwaysBounceHorizontal to NO. This will prevent the scroll view from "rubber banding" even though you've told it there's no more horizontal content to display.

UIScrollView *scrollView;
CGSize size = scrollView.contentSize;
size.width = CGRectGetWidth(scrollView.frame);
scrollView.contentSize = size;
scrollView.alwaysBounceHorizontal = NO;

滚动视图中的实际内容并不重要.

It doesn't matter what's actually inside the scroll view.

Swift 5.0

let scrollView = UIScrollView() // Or however you want to initialize it
var size = scrollView.contentSize
size.width = scrollView.frame.width
scrollView.contentSize = size
scrollView.alwaysBounceHorizontal = false

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