blocks|key|1674050|text|不幸的是，这个老生常谈的解决方案是我找到的唯一解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1674051|[vc.popoverPresentationController+setSourceRect:newSourceRect];
[vc+setPreferredContentSize:CGRectInset(vc.view.frame,+-0.01,+0.0).size];|code-block|syntax|javascript|1674052|这会临时更改所显示视图的内容大小，导致弹出窗口和箭头被重新定位。大小的临时更改不可见。|1674053|这似乎是苹果需要解决的问题-当UIPopoverPresentationController已经呈现弹出窗口时，更改sourceView或sourceRect属性什么也不做(没有这个解决方法)。|offset|length|style|CODE|1674054|希望这也适用于你！|1674055|entityMap^0|0|0|0|F|V|1M|A|1X|A|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|V|8|@$K|W|L|X|M|N]|$K|Y|L|Z|M|N]|$K|10|L|11|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|12|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|R|$]]

Unfortunately this hacky workaround is the only solution I've found:

<pre><code>[vc.popoverPresentationController setSourceRect:newSourceRect];
[vc setPreferredContentSize:CGRectInset(vc.view.frame, -0.01, 0.0).size];
</code></pre>

This temporarily changes the content size of the presented view, causing the popover and arrow to be repositioned. The temporary change in size is not visible. 

It seems this is a problem Apple need to fix - changing the <code>sourceView</code> or <code>sourceRect</code> properties of <code>UIPopoverPresentationController</code> does nothing when it's already presenting a popover (without this workaround). 

Hope this works for you too!

blocks|key|1887927|text|以下是如何将弹出框重新居中的示例：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1887928|-+(void)popoverPresentationController:(UIPopoverPresentationController+*)popoverPresentationController+willRepositionPopoverToRect:(inout+CGRect+*)rect+++++inView:(inout+UIView+**)view+{

+++++*rect+=+CGRectMake((CGRectGetWidth((*view).bounds)-2)*0.5f,(CGRectGetHeight((*view).bounds)-2)*0.5f,+2,+2);|code-block|syntax|javascript|1887929|我还使用了这种方法，通过将*rect和*视图设置为原始的sourceRect和sourceView，确保在移动后弹出窗口移动到正确的位置。|1887930|作为补充，我不相信当popover的源是使用条按钮项设置时，这个方法是不会被调用的。|1887931|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]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Here is an example for how to recenter the popover: 

<pre><code>- (void)popoverPresentationController:(UIPopoverPresentationController *)popoverPresentationController willRepositionPopoverToRect:(inout CGRect *)rect inView:(inout UIView **)view {

 *rect = CGRectMake((CGRectGetWidth((*view).bounds)-2)*0.5f,(CGRectGetHeight((*view).bounds)-2)*0.5f, 2, 2);
</code></pre>

I have also used this method to ensure that the popover moved to the correct location after moving by setting the *rect and the *view to the original sourceRect and sourceView.

As an additional note, I don't believe that this method is called when the popover's source is set using a bar button item.

blocks|key|1674162|text|我使用了与@Rowan_Jones在另一个答案中提到的相同的方法，但是我不希望popover的大小实际改变。即使是一个点的零头。我意识到可以多次将preferredContentSize设置为背靠背，但从视觉上看，它的大小只会更改以匹配上一个值。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1674163|[vc.popoverPresentationController+setSourceRect:newSourceRect];
CGSize+finalDesiredSize+=+CGSizeMake(320,+480);
CGSize+tempSize+=+CGSizeMake(finalDesiredSize.width,+finalDesiredSize.height+%2B+1);
[vc+setPreferredContentSize:tempSize];
[vc+setPreferredContentSize:finalDesiredSize];|code-block|syntax|javascript|1674164|因此，即使finalDesiredSize与您的初始preferredContentSize相同，这也会导致弹出窗口被更新，即使它的大小实际上并没有改变。|1674165|entityMap^0|21|K|0|0|5|G|Q|K|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|N|$]]

I used the same method as mentioned in another answer by @Rowan_Jones, however I didn't want the popover's size to actually change. Even by fractions of a point. I realized that you can set the <code>preferredContentSize</code> multiple times back to back, but visually it's size will only change to match the last value.

<pre><code>[vc.popoverPresentationController setSourceRect:newSourceRect];
CGSize finalDesiredSize = CGSizeMake(320, 480);
CGSize tempSize = CGSizeMake(finalDesiredSize.width, finalDesiredSize.height + 1);
[vc setPreferredContentSize:tempSize];
[vc setPreferredContentSize:finalDesiredSize];
</code></pre>

So even if <code>finalDesiredSize</code> is the same as your initial <code>preferredContentSize</code> this will cause the popover to be updated, even though it's size doesn't actually change.

blocks|key|1888028|text|我张贴这篇文章是因为我没有足够的分数来投票或评论。:)+@turbs的答案对我来说非常有效。这应该是公认的答案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1888029|将*rect设置为委托方法中所需的rect：|1888030|(void)popoverPresentationController:(UIPopoverPresentationController+*)popoverPresentationController
++++willRepositionPopoverToRect:(inout+CGRect+*)rect+++++
++++++++inView:(inout+UIView+**)view|code-block|syntax|javascript|1888031|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I'm posting this because I don't have enough points to vote or comment. :)
@turbs's answer worked for me perfectly. It should be the accepted answer.

Setting *rect to the rect you need in the delegate method:

<pre><code>(void)popoverPresentationController:(UIPopoverPresentationController *)popoverPresentationController
 willRepositionPopoverToRect:(inout CGRect *)rect 
 inView:(inout UIView **)view
</code></pre>

blocks|key|1888067|text|在更改了containerView?.setNeedsLayout()的sourceRect之后，我有幸使用了popoverPresentationController和containerView?.layoutIfNeeded()，如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1888068|func+movePopoverTo(_+newRect:+CGRect)+{
++++let+popover+=+self.presentedViewController+as?+MyPopoverViewController+{
++++++++popover.popoverPresentationController?.sourceRect+=+newRect
++++++++popover.popoverPresentationController?.containerView?.setNeedsLayout()
++++++++popover.popoverPresentationController?.containerView?.layoutIfNeeded()
++++}
}|code-block|syntax|javascript|1888069|甚至可以让popover跟随tableView单元格，而无需更改任何内容：|1888070|class+MyTableViewController:+UITableViewController+{

++++override+func+prepare(for+segue:+UIStoryboardSegue,+sender:+Any?)+{
++++++++if+segue.identifier+==+"MyPopoverSegue"+{
++++++++++++guard+let+controller+=+segue.destination+as?+MyPopoverViewController+else+{+fatalError("Expected+destination+controller+to+be+a+'MyPopoverViewController'!")+}
++++++++++++guard+let+popoverPresentationController+=+controller.popoverPresentationController+else+{+fatalError("No+popoverPresentationController!")+}
++++++++++++guard+let+rowIndexPath+=+sender+as?+IndexPath+else+{+fatalError("Expected+sender+to+be+an+'IndexPath'!")+}
++++++++++++guard+myData.count+>+rowIndexPath.row+else+{+fatalError("Index+(\(rowIndexPath.row))+Out+Of+Bounds+for+array+(count:+\(myData.count))!")+}
++++++++++++if+self.presentedViewController+is+MyPopoverViewController+{
++++++++++++++++self.presentedViewController?.dismiss(animated:+false)
++++++++++++}
++++++++++++popoverPresentationController.sourceView+=+self.tableView
++++++++++++popoverPresentationController.sourceRect+=+self.tableView.rectForRow(at:+rowIndexPath)
++++++++++++popoverPresentationController.passthroughViews+=+[self.tableView]
++++++++++++controller.configure(myData[rowIndexPath.row])
++++++++}
++++++++super.prepare(for:+segue,+sender:+sender)
++++}
}

//+MARK:+-+UIScrollViewDelegate

extension+MyTableViewController+{
++++override+func+scrollViewDidScroll(_+scrollView:+UIScrollView)+{
++++++++if+let+popover+=+self.presentedViewController+as?+MyPopoverViewController+{
++++++++++++popover.popoverPresentationController?.containerView?.setNeedsLayout()
++++++++++++popover.popoverPresentationController?.containerView?.layoutIfNeeded()
++++++++}
++++}
}|1888071|entityMap^0|4|V|10|A|1J|T|2D|V|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|10|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|P|$]]

I had luck using <code>containerView?.setNeedsLayout()</code> and <code>containerView?.layoutIfNeeded()</code> after changing the <code>sourceRect</code> of the <code>popoverPresentationController</code>, like so:

<pre class="lang-swift prettyprint-override"><code>func movePopoverTo(_ newRect: CGRect) {
 let popover = self.presentedViewController as? MyPopoverViewController {
 popover.popoverPresentationController?.sourceRect = newRect
 popover.popoverPresentationController?.containerView?.setNeedsLayout()
 popover.popoverPresentationController?.containerView?.layoutIfNeeded()
 }
}
</code></pre>

And even to have a popover follow a tableView cell without having to change anything:

<pre class="lang-swift prettyprint-override"><code>class MyTableViewController: UITableViewController {

 override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
 if segue.identifier == "MyPopoverSegue" {
 guard let controller = segue.destination as? MyPopoverViewController else { fatalError("Expected destination controller to be a 'MyPopoverViewController'!") }
 guard let popoverPresentationController = controller.popoverPresentationController else { fatalError("No popoverPresentationController!") }
 guard let rowIndexPath = sender as? IndexPath else { fatalError("Expected sender to be an 'IndexPath'!") }
 guard myData.count &gt; rowIndexPath.row else { fatalError("Index (\(rowIndexPath.row)) Out Of Bounds for array (count: \(myData.count))!") }
 if self.presentedViewController is MyPopoverViewController {
 self.presentedViewController?.dismiss(animated: false)
 }
 popoverPresentationController.sourceView = self.tableView
 popoverPresentationController.sourceRect = self.tableView.rectForRow(at: rowIndexPath)
 popoverPresentationController.passthroughViews = [self.tableView]
 controller.configure(myData[rowIndexPath.row])
 }
 super.prepare(for: segue, sender: sender)
 }
}

// MARK: - UIScrollViewDelegate

extension MyTableViewController {
 override func scrollViewDidScroll(_ scrollView: UIScrollView) {
 if let popover = self.presentedViewController as? MyPopoverViewController {
 popover.popoverPresentationController?.containerView?.setNeedsLayout()
 popover.popoverPresentationController?.containerView?.layoutIfNeeded()
 }
 }
}
</code></pre>

blocks|key|1674257|text|iOS+12.3|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1674258|vc.popoverPresentationController.containerView+setNeedsLayout；vc.popoverPresentationController+setSourceRect:newSourceRect；|1674259|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

iOS 12.3

[vc.popoverPresentationController setSourceRect:newSourceRect];
[vc.popoverPresentationController.containerView setNeedsLayout];

I am looking for an effective way to re-position a popover using the new uipopoverpresentationcontroller. I have succesfully presented the popover, and now I want to move it without dismissing and presenting again. I am having trouble using the function:

<pre><code>(void)popoverPresentationController:(UIPopoverPresentationController *)popoverPresentationController
 willRepositionPopoverToRect:(inout CGRect *)rect
 inView:(inout UIView **)view
</code></pre>

I know it's early in the game, but it anyone has an example of how to do this efficiently I would be grateful if you shared it with me. Thanks in advance.

iOS 8 - UIPopoverPresentationController moving popover

我正在寻找一种有效的方法来使用新的uipopoverpresentationcontroller控制器来重新定位popover。我已经成功地展示了popover，现在我想移动它，而不是忽略和再次展示。我在使用这个函数时遇到了问题：(void)popoverPresentationController:(UIPopove...

问iOS 8- UIPopoverPresentationController移动弹出窗口
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