使用 UIDocumentInteractionController 时点击“在 Instagram 中打开”导致 Swift 崩溃

Question

我有以下代码用于从我的 Swift 应用程序在 Instagram 上共享图像： @IBAction func instagramShareButton(sender: AnyObject) {

    let documentsDirectory = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as NSString
    let path = documentsDirectory.stringByAppendingPathComponent("Share Icon.igo")

    let imageName: String = "Share Icon.png"
    let image = UIImage(named: imageName)
    let data = UIImagePNGRepresentation(image!)

    data!.writeToFile(path, atomically: true)

    let imagePath = documentsDirectory.stringByAppendingPathComponent("Share Icon.igo")
    let rect = CGRectMake(0, 0, 0, 0)

    UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, self.view.opaque, 0.0)
    self.view.layer.renderInContext(UIGraphicsGetCurrentContext()!)
    UIGraphicsEndImageContext()

    let fileURL = NSURL(fileURLWithPath: imagePath)
    print("fileURL = \(fileURL)")

    var interactionController = UIDocumentInteractionController(URL: fileURL)

    interactionController.delegate = self

    interactionController.UTI = "com.instagram.exclusivegram"

    let msgBody = "My message"
    interactionController.annotation = NSDictionary(object: msgBody, forKey: "InstagramCaption")
    interactionController.presentOpenInMenuFromRect(rect, inView: self.view, animated: true)
}

func documentInteractionControllerWillPresentOpenInMenu(controller: UIDocumentInteractionController) { }

我将代码从 Objective C 翻译成 Swift，因为我没有在 Swift 中找到任何可以在 Instagram 上分享的内容。

菜单弹出，我在那里看到Instagram，当我点击它时，我收到以下错误：

-[_UIOpenWithAppActivity performActivity] 中的断言失败， /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit/UIKit-3505.16/UIDocumentInteractionController.m:408

*** 由于未捕获的异常“NSInternalInconsistencyException”而终止应用程序，原因： 'UIDocumentInteractionController 过早地消失了！'

我相信我必须以某种方式释放 UIDocumentInteractionController 对象。我对吗？ 还没有找到任何信息来帮助我理解如何在 Swift 中做到这一点。请帮我弄清楚如何解决这个问题。

Answer 1

我认为你是对的。 我也有同样的问题。

在开始分享功能之前，你必须从 UIDocumentInteractionController 创建一个全局变量：

var interactionController: UIDocumentInteractionController?
@IBAction func instagramShareButton(sender: AnyObject) {
    ...
    interactionController = UIDocumentInteractionController(URL: fileURL)
    interactionController!.UTI = "com.instagram.exclusivegram"
    let msgBody = "My message"
    interactionController!.annotation = NSDictionary(object: msgBody, forKey: "InstagramCaption")
    interactionController!.presentOpenInMenuFromRect(rect, inView: self.view, animated: true)
}

这对我有用！