而马特的解决方案似乎对我来说是正确的，你需要考虑到集合视图嵌入，如果有一个已经设置。

修改后的代码为:

CGSize csz = sv.contentSize;
CGSize bsz = sv.bounds.size;
NSInteger bottomInset = sv.contentInset.bottom;
if (sv.contentOffset.y + bsz.height + bottomInset > csz.height) {
    [sv setContentOffset:CGPointMake(sv.contentOffset.x, 
                                     csz.height - bsz.height + bottomInset) 
                animated:YES];
}

Valdyr，希望这对你有帮助

CGPoint bottomOffset = CGPointMake(0, [textView contentSize].height - textView.frame.size.height);

if (bottomOffset.y > 0)
 [textView setContentOffset: bottomOffset animated: YES];

如果contentSize低于边界怎么办?

对于Swift来说，它是:

scrollView.setContentOffset(CGPointMake(0, max(scrollView.contentSize.height - scrollView.bounds.size.height, 0) ), animated: true)

快速执行:

extension UIScrollView {
   func scrollToBottom(animated: Bool) {
     if self.contentSize.height < self.bounds.size.height { return }
     let bottomOffset = CGPoint(x: 0, y: self.contentSize.height - self.bounds.size.height)
     self.setContentOffset(bottomOffset, animated: animated)
  }
}

使用它:

yourScrollview.scrollToBottom(animated: true)

使用(可选)footerView和contentInset，解决方案是:

CGPoint bottomOffset = CGPointMake(0, _tableView.contentSize.height - tableView.frame.size.height + _tableView.contentInset.bottom);
if (bottomOffset.y > 0) [_tableView setContentOffset: bottomOffset animated: YES];

要滚动到底部，我们必须使用目标视图的最大高度。

import UIKit

extension UIScrollView {

    func scrollToBottomOf(targetView: UIView, animated: Bool) {
        setContentOffset(CGPoint(x:targetView.frame.minX, y:targetView.frame.maxY), animated: animated)
    }
}

//func invocation example 
optionScrollView.scrollToBottomOf(targetView: self.optionsStackView, animated: false)