IOS UIActivityViewController

Question

我实际上正在做一个简单的应用程序，它是 Mememe 类的。我的问题是在使用 UIActivityViewController 时尝试保存、共享等。但为什么它没有发生在这里？我想这是因为传递了一个空图像。但我真的不知道如何解决它。谁能帮帮我吗？这是代码:

@IBAction func savingMyImage(sender: AnyObject) {
    let image = UIImage()
    let controller = UIActivityViewController(activityItems: [image], applicationActivities: nil)
    presentViewController(controller, animated: true, completion: nil)

    controller.completionWithItemsHandler = { (activity: String?, completed: Bool, items: [AnyObject]?, error: NSError?) -> Void in
      if completed {
        self.save()
        self.dismissViewControllerAnimated(true, completion: nil)
      }
    }
}

感谢大家。

Answer 1

我在 iPad 2 和 iPad Air 模拟器上运行它并得到以下错误。我不需要为 iPhone 6 添加 popover 行

ViewControllerExp[1911:87261] *** 由于未捕获的异常“NSGenericException”而终止应用程序，原因:“UIPopoverPresentationController (<_UIAlertControllerActionSheetRegularPresentationController: 0x7f94a24c3a80>) 应该在演示发生之前设置一个非零的 sourceView 或 barButtonItem。”

这段代码对我有用:

    let image = UIImage()

    let controller = UIActivityViewController(activityItems:[image], applicationActivities:nil)

    //had to add this line to get it to work for the iPad simulator; 
    //it is not necessary for the iPhone 6 simulator
    controller.popoverPresentationController?.sourceView = self.view

    self.presentViewController(controller, animated:true, completion:nil)