Facebook Share打开App的新实例 - iOS

Question

我使用Facebook iOS SDK和FBSDKShareLinkContent与文本共享网址和图片。分享时一切似乎都可以。但问题是在共享之后，应用程序的新实例被打开。已完成的共享仍在后台开放。

我做错了什么吗？如何避免呢？

以下是我用来分享的代码......

FBSDKShareLinkContent *content = [[FBSDKShareLinkContent alloc] init];
content.contentDescription = [[MusicPlayerHelper playerManager] getTextToShare];
content.contentURL = [NSURL URLWithString:[[MusicPlayerHelper playerManager] getURLToShare]];
content.imageURL=[NSURL URLWithString:[[MusicPlayerHelper playerManager] getImageURLToShare]];

FBSDKShareDialog *dialog = [[FBSDKShareDialog alloc] init];

if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"fbauth2://"]]){
    dialog.mode = FBSDKShareDialogModeNative;
}
else {
    dialog.mode = FBSDKShareDialogModeAutomatic; //or FBSDKShareDialogModeAutomatic
}

dialog.shareContent = content;
dialog.delegate = _delegate;
dialog.fromViewController = _delegate;
[dialog show];