UIScrollView 不滚动?

问题描述

我在界面生成器中创建了一个 UIScrollView，其中已经添加了一堆 UITextView 和 UIImageView 对象.我将它连接到 IBOutlet，并在 -(void)viewDidLoad 下将其内容大小设置为 1200x2000.启用用户交互、多点触控、启用滚动并显示垂直和水平滚动指示器都设置为 YES.当我在 iOS 模拟器中启动应用程序时，它不会滚动.这种行为的原因可能是什么?

I have a UIScrollView created in interface builder with a bunch of UITextView and UIImageView objects already added. I have it connected to an IBOutlet, and under -(void)viewDidLoad I set its content size to 1200x2000. User interaction Enabled, Multitouch, Scrolling Enabled and shows vertical and horizontal scroll indicators are all set to YES. When I launch the app in the iOS simulator, it doesn't scroll. What could possibly be the cause of this behavior?

推荐答案

1. viewDidLoad 即将推出.您必须等到视图布局完成后.尝试在 viewDidAppear 中设置 contentSize.

1. viewDidLoad is to soon. You must wait until after the layout of the views has taken place. Try setting the contentSize in viewDidAppear.

你在使用自动布局吗?如果是这样，请查看以下答案(并忘记 1.):UIScrollView 不使用自动布局约束.

Are you using autolayout? If so, check out the following answer (and forget 1.): UIScrollView doesn't use autolayout constraints.

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