如何从选项卡而不是视图中获得弹出窗口 [英] How can I have a popover come from a tab instead of a view

问题描述

我有一个标签栏应用，我想要一个标签来自其中一个标签。有没有一个好的/简单的方法来做到这一点而不改变观点？

I have a tabbar app, and I want a popover to come from one of the tabs. Is there a good/easy way to do this without changing views?

推荐答案

目前没有办法直接（通过支持的api调用）获取特定标签栏项的框架。我所做的只是显示标签栏左端的弹出窗口，如下所示：

There isn't currently a way to directly (through a supported api call) get the frame of a specific tab bar item. What I do is just show the popup from the left end of the tab bar like this:

CGFloat tabBarHeight = self.tabBarController.tabBar.bounds.size.height;
CGRect rect = CGRectMake(0, 0, tabBarHeight, tabBarHeight);
[popoverController presentPopoverFromRect:rect 
    inView:self.tabBarController.tabBar 
    permittedArrowDirections:UIPopoverArrowDirectionDown animated:YES];

如果您确实考虑当前方向，可以尝试估算标签栏项目的位置想要并调整上面矩形的X坐标。

You could try to estimate the position of the tab bar item taking the current orientation into account if you really wanted to and adjust the X coordinate of the rect above.

您还可以查看标签栏的子视图并找到UITabBarButton对象，但是没有记录，所以不建议这样做。

You could also look through the subviews of the tabbar and find the UITabBarButton object but that's not documented so it's not recommended.

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