在使用UIDocumentInteractionController时,迅速捣毁“在Instagram中打开”

@H_404_0@ 我有以下代码,用于从 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)
 
    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){
}

代码从Objective C转换为Swift,因为我没有在Swift中发现任何东西在Instagram上分享.

菜单弹出,我看到instagram在那里,当我点击它,我得到以下错误：

Assertion failure in -[_UIOpenWithAppActivity performActivity],
/BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit/UIKit-3505.16/UIDocumentInteractionController.m:408

*** Terminating app due to uncaught exception ‘NSInternalInconsistencyException’,reason:
‘UIDocumentInteractionController has gone away prematurely!’

我相信我不得不释放UIDocumentInteractionController对象.我对吗？
没有找到任何信息来帮助我了解如何在Swift中做到这一点.请帮我找出如何解决这个问题.

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,animated: true)
}

在使用UIDocumentInteractionController时,迅速捣毁“在Instagram中打开”

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