blocks|key|425392|text|iOS+7更新|type|unstyled|depth|inlineStyleRanges|entityRanges|data|425393|[self.scrollView+setContentOffset:
++++CGPointMake(0,+-self.scrollView.contentInset.top)+animated:YES];|code-block|syntax|javascript|425394|原创|425395|[self.scrollView+setContentOffset:CGPointZero+animated:YES];|425396|或者，如果您想保留水平滚动位置而仅重置垂直位置：|425397|[self.scrollView+setContentOffset:CGPointMake(self.scrollView.contentOffset.x,+0)
++++animated:YES];|425398|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

<h3>UPDATE FOR iOS 7</h3>

<pre><code>[self.scrollView setContentOffset:
 CGPointMake(0, -self.scrollView.contentInset.top) animated:YES];
</code></pre>

<h3>ORIGINAL</h3>

<pre><code>[self.scrollView setContentOffset:CGPointZero animated:YES];
</code></pre>

or if you want to preserve the horizontal scroll position and just reset the vertical position:

<pre><code>[self.scrollView setContentOffset:CGPointMake(self.scrollView.contentOffset.x, 0)
 animated:YES];
</code></pre>

blocks|key|640152|text|下面是一个Swift扩展，它可以让这一切变得简单：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|640153|extension+UIScrollView+{
++++func+scrollToTop()+{
++++++++let+desiredOffset+=+CGPoint(x:+0,+y:+-contentInset.top)
++++++++setContentOffset(desiredOffset,+animated:+true)
+++}
}|code-block|syntax|javascript|640154|用法：|640155|myScrollView.scrollToTop()|640156|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Here is a Swift extension that makes it easy:

<pre><code>extension UIScrollView {
 func scrollToTop() {
 let desiredOffset = CGPoint(x: 0, y: -contentInset.top)
 setContentOffset(desiredOffset, animated: true)
 }
}
</code></pre>

Usage:

<pre><code>myScrollView.scrollToTop()
</code></pre>

blocks|key|425914|text|对于Swift+4|type|unstyled|depth|inlineStyleRanges|entityRanges|data|425915|scrollView.setContentOffset(.zero,+animated:+true)|code-block|syntax|javascript|425916|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

For Swift 4

<pre><code>scrollView.setContentOffset(.zero, animated: true)
</code></pre>

blocks|key|639823|text|使用setContentOffset:animated:|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|639824|[scrollView+setContentOffset:CGPointZero+animated:YES];|code-block|syntax|javascript|639825|entityMap^0|2|Q|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Use <code>setContentOffset:animated:</code>

<pre><code>[scrollView setContentOffset:CGPointZero animated:YES];
</code></pre>

blocks|key|425739|text|Swift+2.0/3.0/4.0和iOS+7%2B的答案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|425740|let+desiredOffset+=+CGPoint(x:+0,+y:+-self.scrollView.contentInset.top)
self.scrollView.setContentOffset(desiredOffset,+animated:+true)|code-block|syntax|javascript|425741|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Answer for Swift 2.0/3.0/4.0 and iOS 7+:

<pre><code>let desiredOffset = CGPoint(x: 0, y: -self.scrollView.contentInset.top)
self.scrollView.setContentOffset(desiredOffset, animated: true)
</code></pre>

blocks|key|425498|text|在iOS7中，我很难让一个特定的滚动视图转到顶部，这在iOS6中是有效的，并使用它将滚动视图设置为转到顶部。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|425499|[self.myScroller+scrollRectToVisible:CGRectMake(0,+0,+1,+1)+animated:NO];|code-block|syntax|javascript|425500|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In iOS7 I had trouble getting a particular scrollview to go to the top, which worked in iOS6, and used this to set the scrollview to go to the top. 

<pre><code>[self.myScroller scrollRectToVisible:CGRectMake(0, 0, 1, 1) animated:NO];
</code></pre>

blocks|key|640264|text|Swift+3.0.1版本的rob+mayoff's+answer：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|640265|self.scrollView.setContentOffset(
CGPoint(x:+0,y:+-self.scrollView.contentInset.top),
animated:+true)|code-block|syntax|javascript|640266|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/9450345/3171181^0|E|J|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Swift 3.0.1 version of <a href="https://stackoverflow.com/a/9450345/3171181">rob mayoff's answer</a> :

<pre><code>self.scrollView.setContentOffset(
CGPoint(x: 0,y: -self.scrollView.contentInset.top),
animated: true)
</code></pre>

blocks|key|640341|text|在SWIFT+5中，只需将内容偏移量设置为零|type|unstyled|depth|inlineStyleRanges|entityRanges|data|640342|scrollView.setContentOffset(CGPoint.zero,+animated:+true)|code-block|syntax|javascript|640343|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In SWIFT 5
Just set content Offset to zero

<pre><code>scrollView.setContentOffset(CGPoint.zero, animated: true)
</code></pre>

blocks|key|425612|text|要完全复制状态栏的scrollToTop行为，我们不仅需要设置contentOffset，还需要确保显示scrollIndicators。否则，用户可能很快就会迷路。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|425613|完成此操作的唯一公共方法是flashScrollIndicators。不幸的是，在设置contentOffset之后调用它一次没有任何效果，因为它会立即被重置。我发现它工作时，在scrollViewDidScroll:中的每一次闪光。|offset|length|style|CODE|425614|//+define+arbitrary+tag+number+in+a+global+constants+or+in+the+.pch+file
#define+SCROLLVIEW_IS_SCROLLING_TO_TOP_TAG+19291

-+(void)scrollContentToTop+{
++++[self.scrollView+setContentOffset:CGPointMake(self.scrollView.contentOffset.x,+-self.scrollView.contentInset.top)+animated:YES];

++++self.scrollView.tag+=+SCROLLVIEW_IS_SCROLLING_TO_TOP_TAG;
++++dispatch_after(dispatch_time(DISPATCH_TIME_NOW,+(int64_t)(0.3+*+NSEC_PER_SEC)),+dispatch_get_main_queue(),+%5E{
++++++++self.scrollView.tag+=+0;
++++});
}|code-block|syntax|javascript|425615|在您的UIScrollViewDelegate+(或UITable/UICollectionViewDelegate)中实现以下内容：|425616|-+(void)scrollViewDidScroll:(UIScrollView+*)scrollView+{
++++if+(scrollView.tag+==+SCROLLVIEW_IS_SCROLLING_TO_TOP_TAG)+{
++++++++[scrollView+flashScrollIndicators];
++++}
}|425617|与状态栏scrollToTop行为相比，隐藏延迟要短一些，但它看起来还是不错的。|425618|请注意，我滥用了视图标记来传递"isScrollingToTop“状态，因为我需要跨视图控制器使用它。如果您将标记用于其他内容，则可能需要将其替换为iVar或属性。|425619|entityMap^0|0|D|L|2H|K|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@$D|Y|E|Z|F|G]|$D|10|E|11|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|12|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|13|8|@]|9|@]|A|$]]|$1|O|3|P|5|J|7|14|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|15|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|16|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|V|$]]

To fully replicate the status bar scrollToTop behavior we not only have to set the contentOffset but also want to make sure the scrollIndicators are displayed. Otherwise the user can quickly get lost.

The only public method to accomplish this is <code>flashScrollIndicators</code>. Unfortunately, calling it once after setting the contentOffset has no effect because it's reset immediately. I found it works when doing the flash each time in <code>scrollViewDidScroll:</code>.

<pre><code>// define arbitrary tag number in a global constants or in the .pch file
#define SCROLLVIEW_IS_SCROLLING_TO_TOP_TAG 19291

- (void)scrollContentToTop {
 [self.scrollView setContentOffset:CGPointMake(self.scrollView.contentOffset.x, -self.scrollView.contentInset.top) animated:YES];

 self.scrollView.tag = SCROLLVIEW_IS_SCROLLING_TO_TOP_TAG;
 dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
 self.scrollView.tag = 0;
 });
}
</code></pre>

In your UIScrollViewDelegate (or UITable/UICollectionViewDelegate) implement this:

<pre><code>- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
 if (scrollView.tag == SCROLLVIEW_IS_SCROLLING_TO_TOP_TAG) {
 [scrollView flashScrollIndicators];
 }
}
</code></pre>

The hide delay is a bit shorter compared to the status bar scrollToTop behavior but it still looks nice. 

Note that I'm abusing the view tag to communicate the "isScrollingToTop" state because I need this across view controllers. If you're using tags for something else you might want to replace this with an iVar or a property.

blocks|key|425907|text|滚动到顶部，查看UITableViewController、UICollectionViewController或任何具有UIScrollView的UIViewController|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|425908|extension+UIViewController+{

++func+scrollToTop(animated:+Bool)+{
++++if+let+tv+=+self+as?+UITableViewController+{
++++++++tv.tableView.setContentOffset(CGPoint.zero,+animated:+animated)
++++}+else+if+let+cv+=+self+as?+UICollectionViewController{
++++++++cv.collectionView?.setContentOffset(CGPoint.zero,+animated:+animated)
++++}+else+{
++++++++for+v+in+view.subviews+{
++++++++++++if+let+sv+=+v+as?+UIScrollView+{
++++++++++++++++sv.setContentOffset(CGPoint.zero,+animated:+animated)
++++++++++++}
++++++++}
++++}
++}
}|code-block|syntax|javascript|425909|entityMap^0|8|L|U|Q|1P|C|22|G|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|L|$]]

Scroll to top for <code>UITableViewController</code>, <code>UICollectionViewController</code> or any <code>UIViewController</code> having <code>UIScrollView</code>

<pre><code>extension UIViewController {

 func scrollToTop(animated: Bool) {
 if let tv = self as? UITableViewController {
 tv.tableView.setContentOffset(CGPoint.zero, animated: animated)
 } else if let cv = self as? UICollectionViewController{
 cv.collectionView?.setContentOffset(CGPoint.zero, animated: animated)
 } else {
 for v in view.subviews {
 if let sv = v as? UIScrollView {
 sv.setContentOffset(CGPoint.zero, animated: animated)
 }
 }
 }
 }
}
</code></pre>

blocks|key|425989|text|在现代iOS中，将滚动视图的内容偏移量设置回左上角的adjustedContentInset|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|425990|let+point+=+CGPoint(x:+-scrollView.adjustedContentInset.left,
++++++++++++++++++++y:+-scrollView.adjustedContentInset.top)
++++
scrollView.setContentOffset(point,+animated:+true)|code-block|syntax|javascript|425991|entityMap^0|Q|K|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

In modern iOS, set the the scroll view's content offset back to its top left <code>adjustedContentInset</code>:
<pre><code>let point = CGPoint(x: -scrollView.adjustedContentInset.left,
 y: -scrollView.adjustedContentInset.top)
 
scrollView.setContentOffset(point, animated: true)
</code></pre>

blocks|key|425840|text|我试过所有的方法。但对我来说什么都不管用。最后，我喜欢上了这个。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|425841|我在viewDidLoad中添加了self.view+.addSubview(self.scroll)代码行。在开始设置滚动视图的框架和添加滚动视图的组件后。|offset|length|style|CODE|425842|这对我很管用。|425843|确保在开头添加了self.view+.addSubview(self.scroll)行。然后，您可以添加UI元素。|425844|entityMap^0|0|H|Y|0|0|8|Y|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@$D|P|E|Q|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|R|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|S|8|@$D|T|E|U|F|G]]|9|@]|A|$]]|$1|L|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|M|$]]

I tried all the ways. But nothing worked for me. Finally I did like this.

I added <code>self.view .addSubview(self.scroll)</code> line of code in the viewDidLoad. After started setting up frame for scroll view and added components to scroll view.

It worked for me.

Make sure you added <code>self.view .addSubview(self.scroll)</code> line in the beginning. then you can add UI elements.

问让UIScrollView滚动到顶部
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