UINavigationBar隱藏時提供activityViewController

Question

我的項目是整個故事板，我有一個UITableViewController嵌入在NavigationController和每個單元格我有一個按鈕來分享通知。

@IBAction func shareSheetButtonFeed(sender: AnyObject) { 
     let btnPos: CGPoint = sender.convertPoint(CGPointZero, toView: self.tableView) 
     let indexPath: NSIndexPath = self.tableView.indexPathForRowAtPoint(btnPos)! 
     passaValor = Int(indexPath.row) 
     let printtestess = (objects?[passaValor] as! PFObject) 

     let textToShare: AnyObject = (printtestess.objectForKey("subject")! as! String) + " - Cheque agora em:" 


     let myWebsite = NSURL(string:"http://www.mysite.com.br/") 
     let img: UIImage = UIImage(named: "myLogo-1024x1024")! 

     guard let url = myWebsite else { 
      print("nothing found") 
      return 
     } 
     self.navigationController?.setNavigationBarHidden(false, animated: true) 
     let shareItems:Array = [img, textToShare, url] 
     let activityViewController:UIActivityViewController = UIActivityViewController(activityItems: shareItems, applicationActivities: nil) 
     activityViewController.excludedActivityTypes = [UIActivityTypePrint, UIActivityTypePostToWeibo, UIActivityTypeCopyToPasteboard, UIActivityTypeAddToReadingList, UIActivityTypePostToVimeo] 
     self.presentViewController(activityViewController, animated: true, completion: nil) 
     } 

問題是，當我在點擊該按鈕的shareSheet提出後，我選擇了社交網絡，Twitter或Facebook等我以前的導航欄dissapear。

我試着用這條線，按鈕內解決問題，當我在按鈕再點擊導航欄重新顯示：

self.navigationController?.setNavigationBarHidden(false, animated: true) 

所以我試圖把ViewWillAppear內這條線，但它不工作。

Obs：我正在使用自動佈局

謝謝。

Answer 1

請嘗試等待，直到分享表關閉以顯示導航欄。爲此，請在UIActivityViewController上設置completionWithItemsHandler屬性。

activityViewController.completionWithItemsHandler = { _ in 
    self.navigationController?.setNavigationBarHidden(false, animated: true) 
}