UIScrollView contentInset 属性有什么用? [英] What's the UIScrollView contentInset property for?

问题描述

有人可以向我解释 UIScrollView 实例中的 contentInset 属性的用途吗?也许提供一个例子?

Can someone explain to me what the contentInset property in a UIScrollView instance is used for? And maybe provide an example?

推荐答案

它设置内容视图和封闭滚动视图之间的插入距离.

It sets the distance of the inset between the content view and the enclosing scroll view.

Obj-C

aScrollView.contentInset = UIEdgeInsetsMake(0, 0, 0, 7.0);

Swift 5.0

aScrollView.contentInset = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 7.0)

这是一篇很好的 iOS 参考库文章滚动视图具有信息丰富的屏幕截图(图 1-3) - 我将在此处通过文本复制它:

Here's a good iOS Reference Library article on scroll views that has an informative screenshot (fig 1-3) - I'll replicate it via text here:

  _|←_cW_→_|_↓_
   |       | 
---------------
   |content| ↑
 ↑ |content| contentInset.top
cH |content|
 ↓ |content| contentInset.bottom
   |content| ↓
---------------
  _|_______|___ 
             ↑


   (cH = contentSize.height; cW = contentSize.width)

滚动视图包含内容视图以及指定内容插入提供的任何填充.

The scroll view encloses the content view plus whatever padding is provided by the specified content insets.

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