“未找到符号” iPhone / iPad通用应用程序中的UIPopoverController错误 [英] "Symbol not found" error for UIPopoverController in an iPhone/iPad Universal App

问题描述

在我的通用二进制iPhone / iPad应用程序中，用户可以在模态呈现的视图控制器中调整首选项。
在iPhone上，设置面板显示presentModalViewController：animated：，在iPad上，我使用UIPopoverController。

In a universal binary iPhone/iPad app of mine, users are able to adjust preferences in a view controller that's presented modally. On the iPhone, the settings panel is presented with presentModalViewController:animated:, and on the iPad, I use a UIPopoverController.

我有点哎呀一段时间完全隔离UIPopoverController代码远离iPhone代码。每次我为iPhone编译时，都会出现以下错误：

I'm having a heck of a time completely isolating the UIPopoverController code away from the iPhone code. Everytime I compile for the iPhone, I get the following error:

dyld: Symbol not found: _OBJC_CLASS_$_UIPopoverController
  Referenced from: /var/mobile/Applications/CBB37F87-AA6D-47E2-823A-E259E3268A32/MyApp debug.app/MyApp
  Expected in: /System/Library/Frameworks/UIKit.framework/UIKit

这当然是因为iPhone上的UIKit没有UIPopoverController类。有没有人建议如何有效地隔离iPad API包含的iPhone代码，所以我实际上可以运行我的代码？

This is of course because UIKit on the iPhone doesn't have a UIPopoverController class. Does anybody have advice for how to effectively isolate the iPad API includes from the iPhone code, so I can actually run my code?

推荐答案

啊，没关系。查看Apple的示例应用程序TopPaid

Ahhhh nevermind. Check out Apple's example app "TopPaid"

这有点hacky，但它确实有效。希望有一个更优雅的解决方案...

It's kinda hacky, but it works. Wish there was a more elegant solution...

Class cls = NSClassFromString(@"UIPopoverController");
if (cls != nil)
{
    UIPopoverController *aPopoverController =
        [[cls alloc] initWithContentViewController:self.masterViewController];
    self.popoverController = aPopoverController;

    [aPopoverController release];

    [popoverController presentPopoverFromBarButtonItem:barButtonItem
                              permittedArrowDirections:UIPopoverArrowDirectionUp
                                              animated:YES];
}

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