以编程方式将滚动视图滚动到其底部 [英] scrolling a scrollview to its bottom programmatically

问题描述

我有一个滚动视图，正在尝试以编程方式滚动到其底部..

i have a scrollview and am trying to scroll to its bottom programmatically..

尝试了这些:

extension UIScrollView {

// Bonus: Scroll to bottom
func scrollToBottom() {
    let bottomOffset = CGPoint(x: 0, y: contentSize.height - bounds.size.height + contentInset.bottom)
    if(bottomOffset.y > 0) {
        setContentOffset(bottomOffset, animated: true)
    }
}

}

来自:

以编程方式滚动Swift 中 UIScrollView 到子 UIView(子视图)的顶部

  let bottomOffset = CGPoint(x: 0, y: scrollView.contentSize.height - scrollView.bounds.size.height)
  scrollView.setContentOffset(bottomOffset, animated: true)

来自:

UIScrollView 以编程方式滚动到底部

但两者都没有做任何事情......

but both didn't do anything ...

怎么做?

推荐答案

偏移设置不起作用，因为您尝试在生命周期的早期调用.

The offset setting doesn't works because you tried in calling early in the life cycle.

您可以尝试更新 viewDidLayoutSubviews 或 viewDidAppear

You could try updating the contentOffset at viewDidLayoutSubviews or viewDidAppear

let bottomOffset = CGPoint(x: 0, y: scrollView.contentSize.height - scrollView.bounds.size.height)
 scrollView.setContentOffset(bottomOffset, animated: true)

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