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

问题描述

是否可以将UIScrollView自动调整为要滚动的内容的高度(或宽度)?

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

类似的东西:

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

推荐答案

我见过的最好的方法，用于基于UIScrollView的子视图来更新其内容大小:

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

Objective-C

CGRect contentRect = CGRectZero;

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

快速

let contentRect: CGRect = scrollView.subviews.reduce(into: .zero) { rect, view in
    rect = rect.union(view.frame)
}
scrollView.contentSize = contentRect.size

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