blocks|key|311565|text|你不能用苹果内置的UIPopoverViewController类按原样操作。但是实现你自己的popover视图控制器应该是相当简单和合乎逻辑的(只需要一些非常基本的2D几何图形和一些UIView文档的挖掘)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|311566|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|$]]

You can't do it as-is with Apple's built-in UIPopoverViewController class. But it should be fairly simple and logical to implement your own popover view controller (just some very basic 2D geometry and a bit of digging in UIView's docs).

blocks|key|528577|text|是的，你可以这样做。您必须使用alpha=0.0f创建aux视图，并使用它来引导箭头。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|528578|例如：|528579|auxView+=+[[UIView+alloc]+initWithFrame:firstButton.frame];
auxView.alpha+=+0.0+;
auxView.userInteractionEnabled+=+NO;
[firstButton.superView+addSubview:auxView];
[auxView+release];|code-block|syntax|javascript|528580|好了，现在你可以使用该视图作为箭头的向导来打开popover。|528581|[thePopoverController+presentPopoverFromRect:auxView.bounds+inView:auxView
++++++++++++permitedArrowDirections:UIPopoverArrowDirectionLeft+animated:YES];|528582|现在，您只需移动视图：|528583|auxView.frame+=+secondButton.frame;|528584|如果你愿意的话，可以使用动画来完成这个动作。|528585|还有一件事，对于这种箭头到按钮，我更喜欢箭头接触按钮。您可以使用：|528586|presentPopoverFromRect:CGRectInset(auxView.bounds,+4.0,+4.0)|528587|entityMap^0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|13|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|15|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|16|8|@]|9|@]|A|$]]|$1|U|3|V|5|F|7|17|8|@]|9|@]|A|$G|H]]|$1|W|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|X|$]]

Yes, you can do that. You have to create an aux view, with alpha=0.0f, and use it to guide the arrow.

For example:

<pre><code>auxView = [[UIView alloc] initWithFrame:firstButton.frame];
auxView.alpha = 0.0 ;
auxView.userInteractionEnabled = NO;
[firstButton.superView addSubview:auxView];
[auxView release];
</code></pre>

Ok, now you open popover using that view as arrow's guide.

<pre><code>[thePopoverController presentPopoverFromRect:auxView.bounds inView:auxView
 permitedArrowDirections:UIPopoverArrowDirectionLeft animated:YES];
</code></pre>

And now you only have to move the view:

<pre><code>auxView.frame = secondButton.frame;
</code></pre>

Use animations for that move if you want.

One more thing, for this kind of arrow to button, I prefer that the arrow touches the button. You can use:

<pre><code>presentPopoverFromRect:CGRectInset(auxView.bounds, 4.0, 4.0)
</code></pre>

blocks|key|311714|text|对于我的弹出，我希望箭头是左上角，而不是中上角(这是默认的)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|311715|通过设置UIPopoverController的popoverLayoutMargins属性，我成功地获得了下面的结果(屏幕截图)。您可以使用它来减小UIPopoverController内部计算中使用的屏幕区域，以确定在何处显示弹出窗口。|offset|length|style|CODE|311716|​|311717|📷|atomic|311718|311719|代码：|311720|//+Get+the+location+and+size+of+the+control+(button+that+says+"Drinks")
CGRect+rect+=+control.frame;

//+Set+the+width+to+1,+this+will+put+the+anchorpoint+on+the+left+side
//+of+the+control
rect.size.width+=+1;

//+Reduce+the+available+screen+for+the+popover+by+creating+a+left+margin
//+The+popover+controller+will+assume+that+left+side+of+the+screen+starts
//+at+rect.origin.x
popoverC.popoverLayoutMargins+=+UIEdgeInsetsMake(0,+rect.origin.x,+0,+0);

//+Simply+present+the+popover+(force+arrow+direction+up)
[popoverC+presentPopoverFromRect:rect+inView:self.view+permittedArrowDirections:UIPopoverArrowDirectionUp+animated:YES];|code-block|syntax|javascript|311721|我认为你可以通过调整上面的方法来得到想要的结果。|311722|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/560ce2b6ce5b741fbaaee08e12bb6c3a.png|imageAlt^0|0|O|K|0|0|0|1|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|15|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|16|8|@$D|17|E|18|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|19|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|1A|8|@]|9|@$D|1B|E|1C|1|1D]]|A|$]]|$1|M|3|I|5|6|7|1E|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|1F|8|@]|9|@]|A|$]]|$1|P|3|Q|5|R|7|1G|8|@]|9|@]|A|$S|T]]|$1|U|3|V|5|6|7|1H|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]]|X|$Y|$5|Z|10|11|A|$12|13|14|-4]]]]

For my popover I wanted the arrow to be top-left instead of top-center (which is default).

I've managed to get the result below (screenshot) by setting the <code>popoverLayoutMargins</code> property of the UIPopoverController. You can use it to reduce the screen-area used in the internal calculations of the UIPopoverController to determine where to show the popover.

<img src="https://i.stack.imgur.com/6oYBJ.png" alt="UIPopovercontroller arrow on the left">

The code:

<pre><code>// Get the location and size of the control (button that says "Drinks")
CGRect rect = control.frame;

// Set the width to 1, this will put the anchorpoint on the left side
// of the control
rect.size.width = 1;

// Reduce the available screen for the popover by creating a left margin
// The popover controller will assume that left side of the screen starts
// at rect.origin.x
popoverC.popoverLayoutMargins = UIEdgeInsetsMake(0, rect.origin.x, 0, 0);

// Simply present the popover (force arrow direction up)
[popoverC presentPopoverFromRect:rect inView:self.view permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];
</code></pre>

I think you'll be able to get the desired result by tweaking the above.

My goal is to keep same coordinates for a UIPopoverController with just changing arrow offset.
So basically i have three buttons touching each of them shows up a popover. When presenting this popover it changes position on the screen, but i do not want that.
To be more clear look at screenoshots:

<img src="https://i.stack.imgur.com/DGMMO.png" alt="enter image description here">

<img src="https://i.stack.imgur.com/ISLqG.png" alt="enter image description here">

<img src="https://i.stack.imgur.com/5OYlI.png" alt="enter image description here">

Present UIPopoverController in same position with changing just arrow offset

我的目标是通过改变箭头偏移量来保持UIPopoverController的坐标不变。所以基本上我有三个按钮，每个按钮都会显示一个弹出窗口。当显示此弹出窗口时，它会改变屏幕上的位置，但我不希望这样。更清楚地说，请看截图：​​​​​​

问在相同位置显示UIPopoverController，仅更改箭头偏移量
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