如何自动调整UIScrollView的大小以适合内容 [英] How do I auto size a UIScrollView to fit the content

问题描述

有没有办法让 UIScrollView 自动调整滚动内容的高度（或宽度）？

Is there a way to make a UIScrollView auto-adjust to the height (or width) of the content it's scrolling?

类似于：

[scrollView setContentSize:(CGSizeMake(320, content.height))];

推荐答案

我遇到的最好的更新方法基于其包含的子视图 UIScrollView 的内容大小：

The best method I've ever come across to update the content size of a UIScrollView based on its contained subviews:

ObjC

CGRect contentRect = CGRectZero;

for (UIView *view in self.scrollView.subviews) {
    contentRect = CGRectUnion(contentRect, view.frame);
}
self.scrollView.contentSize = contentRect.size;

Swift

  var contentRect = CGRect.zero

  for view in mainScrollView.subviews {
     contentRect = contentRect.union(view.frame)
  }
  mainScrollView.contentSize = contentRect.size

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