如何更改UIPopoverPresentationController之后的叠加层的不透明度? [英] How can I change the opacity of the overlay behind UIPopoverPresentationController?

问题描述

我正在使用UIPopoverPresentationController在iOS应用中显示弹出窗口.我想使弹出式窗口后面的背景变暗.我怎样才能做到这一点?

I'm using UIPopoverPresentationController to present popovers in an iOS app. I want to dim the background behind the popover when it comes up. How can I do this? Is there an API for it somewhere, or am I going to have to overlay something on the main view when I present the popover?

推荐答案

当我展示弹出窗口时，我最终通过将自己的叠加层覆盖在主视图上来解决了这个问题.我之所以能够轻松做到这一点，是因为我通过一个单例协调器类来处理所有弹出窗口，我的根视图控制器不是导航控制器，并且我可以在任何地方轻松实现它.我还必须在弹出窗口中出现的任何地方都创建UINavigationController的子类，以便可以覆盖dismissViewControllerAnimated:completion:并通知协调器，以便删除覆盖(通过编程方式关闭弹出窗口时，didDismiss委托方法不会被调用).

I ended up solving this by putting my own overlay over my main view when I present the popover. I was able to do this easily because I do all my popovers through one singleton coordinator class, my root view controller isn't a navigation controller, and I can get to it easily everywhere. I also had to create a subclass of UINavigationController everywhere I presented one in a popover so I could override dismissViewControllerAnimated:completion: and notify the coordinator so it removed the overlay (the didDismiss delegate method doesn't get called when the popover is dismissed programmatically).

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