blocks|key|2141654|text|这是免费的，但您应该检查UITableView的scrollsToTop属性是否为YES。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2141655|当您将一个UIScrollView+(或像UITextView这样的子类)对象嵌入到另一个UIScrollView类(像UITableView)中时，这就不起作用了。在这种情况下，将嵌入式UIScrollView类上的scrollsToTop设置为NO。然后，点击状态栏行为将会起作用。|2141656|entityMap^0|C|B|O|C|0|5|C|19|C|1O|B|2M|C|31|C|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|I|$]]

You get this for free, but you should check that the <code>scrollsToTop</code> attribute of your <code>UITableView</code> is YES.

When this does NOT work is when you have a <code>UIScrollView</code> (or descendant class like UITextView) object embedded inside another <code>UIScrollView</code> class (like <code>UITableView</code>). In this case, set <code>scrollsToTop</code> on the embedded <code>UIScrollView</code> class to NO. Then the tap-the-status-bar behavior will work.

blocks|key|4040302|text|如果你来自谷歌，需要一份完整的清单：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4040303|4040304|检查你已经在你的UITableView|ordered-list-item|4040305|Make上设置了scrollsToTop=YES+(根据马克的建议)确保你已经在你的窗口中的所有其他UITableViews+/+UIScrollViews+/+UITextViews上设置了scrollsToTop=NO，这样他们就不会拦截点击。我发现自己多次打印出窗口中的所有视图来调试这个...|4040306|确保您的表视图在窗口内的0/0+(x/y坐标)-这就是系统知道它应该传递消息|4040307|的原因|4040308|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|O|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|P|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|Q|8|@]|9|@]|A|$]]|$1|H|3|I|5|E|7|R|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|S|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|M|$]]

If you came from Google and need a complete checklist:

<ol>
<li>Check that you've set scrollsToTop=YES (per Mark's suggestion) on your UITableView</li>
<li>Make sure that you've set scrollsToTop=NO on all OTHER UITableViews / UIScrollViews / UITextViews in your window, so that they're not intercepting the click. I've found myself printing out all the views in my window many times to debug this...</li>
<li>Make sure that your table view is at 0/0 (x/y coordinates) within the window - this is how the system knows that it should pass the message</li>
</ol>

blocks|key|2141862|text|我也有同样的问题，但通过以下步骤修复：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2141863|对于要滚动到顶部的表视图，|2141864|设置scrollsToTop+=+YES。对于所有其他表视图、集合视图或滚动视图，|ordered-list-item|2141865|设置scrollsToTop+=+NO。如果您的任何表视图单元格具有集合视图，则为|2141866|。确保将集合视图的scrollsToTop也设置为NO。|2141867|2141868|如果您的视图控制器/导航控制器被添加为另一个视图控制器上的子视图，请确保将其设置为子控制器。|2141869|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|R|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|F|7|T|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|U|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|V|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|O|$]]

I had the same problem but fixed by following steps:

<ol>
<li>Set scrollsToTop = YES for tableview you wanted to scroll to top.</li>
<li>set scrollsToTop = NO for all other tableview or collection view or scrollview.</li>
<li>If any of your tableview cell has collection view . Make sure you set scrollsToTop to NO for the collection view as well.</li>
</ol>

If your view controller/ navigation controller is added as a subview on another view controller, Make sure you set it as a child Controller.

blocks|key|302129|text|我知道这是一个相当老的问题，但希望这能有所帮助。根据@MarkGranoff的说法，如果有多个UIScrollView或其子类将其设置为YES+(默认值)，则scrollsToTop不会工作，因此可能值得进行一次理智检查，以检查到底是谁在搞砸这一行为。下面的简单方法循环遍历视图的子视图，并记录视图中所有UIScrollView的scrollsToTop值。最好在您的viewDidAppear方法中调用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|302130|-+(void)checkForScrollViewInView:(UIView+*)view+{
++++for+(UIView+*subview+in+[view+subviews])+{
++++++++if+([subview+isKindOfClass:[UIScrollView+class]])+{
++++++++++++NSLog(@"scrollsToTop+enabled:+%25i+in+scroll+view+%25@",+((UIScrollView+*)subview).scrollsToTop,+subview);
++++++++}
++++++++if+(subview.subviews.count+>+0)+{
++++++++++++[self+checkForScrollViewInView:subview];
++++++++}
++++}
}|code-block|syntax|javascript|302131|这实际上只是一个调试代码。找到每个UIScrollView子类的Yes值后，只需确保只有一个子类设置为scrollsToTop即可。|302132|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I know this is quite an old one but hope this can help. Following what @MarkGranoff said, the scrollsToTop doesn't work if more than one UIScrollView, or its subclasses, has got it set to YES (default value), a sanity check is probably worth to check who's actually messing up with this behaviour. The simple method below loop over the subviews of your view and logs the scrollsToTop value of all the UIScrollView in your view. Preferably to be called in your viewDidAppear method.

<pre><code>- (void)checkForScrollViewInView:(UIView *)view {
 for (UIView *subview in [view subviews]) {
 if ([subview isKindOfClass:[UIScrollView class]]) {
 NSLog(@"scrollsToTop enabled: %i in scroll view %@", ((UIScrollView *)subview).scrollsToTop, subview);
 }
 if (subview.subviews.count &gt; 0) {
 [self checkForScrollViewInView:subview];
 }
 }
}
</code></pre>

This is just a debug code indeed. Once you find the scrollsToTop value for each one of the UIScrollView subclasses just make sure only one is set to YES.

blocks|key|3755490|text|就像Mark说的，您只能有一个scrollsToTop属性设置为TRUE的UIScrollView子类(通常是表视图)。你可能在你的视图中有其他的，典型的是UITextView。只需将它们的scrollsToTop属性设置为FALSE，就可以了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3755491|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Like Mark said, you can only have one subclass of UIScrollView (usually the table view) that has the scrollsToTop property set to TRUE. Likely you have others, typically UITextView in your view. Just set their scrollsToTop property to FALSE and you're good to go.

blocks|key|2141898|text|在UIScrollView头文件中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2141899|2141900|+//当用户点击状态栏时，最接近状态栏的触摸下方的滚动视图将滚动到顶部，但前提是它的scrollsToTop属性为YES，它的委托不从shouldScrollViewScrollToTop返回NO，并且它还不在顶部。//在iPhone上，只有当屏幕上有一个滚动视图且scrollsToTop+==为YES时，我们才执行此手势。如果找到多个，则不会滚动任何内容。|blockquote|offset|length|style|CODE|2141901|2141902|entityMap^0|0|0|16|C|1V|R|3P|C|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|N|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|O|8|@$F|P|G|Q|H|I]|$F|R|G|S|H|I]|$F|T|G|U|H|I]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|L|$]]

On UIScrollView header file:

<blockquote>
 // When the user taps the status bar, the scroll view beneath the touch which is closest to the status bar will be scrolled to top, but only if its <code>scrollsToTop</code> property is YES, its delegate does not return NO from <code>shouldScrollViewScrollToTop</code>, and it is not already at the top.
 // On iPhone, we execute this gesture only if there's one on-screen scroll view with <code>scrollsToTop</code> == YES. If more than one is found, none will be scrolled.
</blockquote>

blocks|key|4040538|text|例如，如果您有一个表格视图和滚动视图，如下所示的标记|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4040539|​|4040540|📷|atomic|offset|length|4040541|4040542|您应该在viewDidLoad中创建类似这样的内容|style|CODE|4040543|self.tableView.scrollsToTop+=+true
self.tagsView.scrollsToTop+=+false|code-block|syntax|javascript|4040544|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/19f125a76f3793071e9a7ae0d96322ab.png|imageAlt^0|0|0|0|1|0|0|0|4|B|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|12|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|13|8|@]|9|@$G|14|H|15|1|16]]|A|$]]|$1|I|3|C|5|6|7|17|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|18|8|@$G|19|H|1A|L|M]]|9|@]|A|$]]|$1|N|3|O|5|P|7|1B|8|@]|9|@]|A|$Q|R]]|$1|S|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z|10|-4]]]]

For example if you have a table view and scroll view like tags like this

<a href="https://i.stack.imgur.com/bKYvO.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/bKYvO.png" alt="enter image description here"></a>

you should make something like this in <code>viewDidLoad</code>

<pre><code>self.tableView.scrollsToTop = true
self.tagsView.scrollsToTop = false
</code></pre>

blocks|key|2141965|text|可以加载多个UIScrollView后代，例如:在包含UITableViews的每个页面上都有一个UIPageViewcontroller。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2141966|默认情况下，scrollsToTop属性为true。|2141967|因此，除了处理嵌套的UIScrollViews的scrollsToTop属性之外，还应该执行以下操作：|2141968|//When+the+view+is+loaded+disable+scrollsToTop,+this+view+may+not+be+the+visible+one
override+func+viewDidLoad()+{
++++super.viewDidLoad()
++++...
++++tableView.scrollsToTop+=+false
}

//Now+it's+time+to+enable+scrolling,+the+view+is+guaranteed+to+be+visible
override+func+viewDidAppear(_+animated:+Bool)+{
++++super.viewDidAppear(animated)
++++tableView.scrollsToTop+=+true
}

//Do+not+forget+to+disable+scrollsToTop,+making+other+visible+UIScrollView+descendant+be+able+to+be+scrolled+to+top
override+func+viewWillDisappear(_+animated:+Bool)+{
++++super.viewWillDisappear(animated)
++++self.tableView.scrollsToTop+=+false
}|code-block|syntax|javascript|2141969|这样，只有一个顶级UITableView的scrollsToTop将被设置为true。|2141970|entityMap^0|6|E|0|6|C|L|4|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@$9|W|A|X|B|C]|$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|10|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|11|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|12|8|@]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|R|$]]

There can be multiple UIScrollView descendants loaded eg.: having a UIPageViewcontroller on each page containing UITableViews.

The scrollsToTop property is true by default.

So in addition to handling nested UIScrollViews' scrollsToTop property, you should do the following:

<pre><code>//When the view is loaded disable scrollsToTop, this view may not be the visible one
override func viewDidLoad() {
 super.viewDidLoad()
 ...
 tableView.scrollsToTop = false
}

//Now it's time to enable scrolling, the view is guaranteed to be visible
override func viewDidAppear(_ animated: Bool) {
 super.viewDidAppear(animated)
 tableView.scrollsToTop = true
}

//Do not forget to disable scrollsToTop, making other visible UIScrollView descendant be able to be scrolled to top
override func viewWillDisappear(_ animated: Bool) {
 super.viewWillDisappear(animated)
 self.tableView.scrollsToTop = false
}
</code></pre>

This way only one top level UITableView's scrollsToTop will be set to true.

I know there's tons of code out there to scroll a tableview to the top, but I want to do this when the top status bar is tapped, just like in Apple's native apps. Is this possible?

Scroll to top of UITableView by tapping status bar

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我知道有大量的代码可以将表格视图滚动到顶部，但我想在点击顶部状态栏时这样做，就像在苹果的原生应用程序中一样。这个是可能的吗？

问点击状态栏滚动到UITableView顶部
EN

回答 8

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问点击状态栏滚动到UITableView顶部
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