callback on closing preview

src/ios/PreviewAnyFile.swift

@@ -2,27 +2,31 @@ import QuickLook
 //new
 @objc(HWPPreviewAnyFile) class PreviewAnyFile: CDVPlugin {
  lazy var previewItem = NSURL()
+ lazy var tempCommandId = String()
  @objc(preview:)
  func preview(_command: CDVInvokedUrlCommand){
- 
+
  var pluginResult = CDVPluginResult(
  status: CDVCommandStatus_ERROR
  )
-
+ tempCommandId = _command.callbackId;
+
  let myUrl = _command.arguments[0] as! String;
  self.downloadfile(withName: myUrl,completion: {(success, fileLocationURL, callback) in
  if success {
- 
+
  self.previewItem = fileLocationURL! as NSURL
  let previewController = QLPreviewController();
  previewController.dataSource = self;
+ previewController.delegate = self;
  DispatchQueue.main.async(execute: {
  self.viewController?.present(previewController, animated: true, completion: nil);
  if self.viewController!.isViewLoaded {
  pluginResult = CDVPluginResult(
  status: CDVCommandStatus_OK,
  messageAs: "SUCCESS"
  );
+ pluginResult?.keepCallback = true;
  self.commandDelegate!.send(
  pluginResult,
  callbackId: _command.callbackId
@@ -39,7 +43,7 @@ import QuickLook
  );
  }
  });
- 
+
  }else{
  pluginResult = CDVPluginResult(
  status: CDVCommandStatus_ERROR,
@@ -49,11 +53,11 @@ import QuickLook
  pluginResult,
  callbackId: _command.callbackId
  );
- 
+
  }
  })
  }
- 
+
  func downloadfile(withName myUrl: String,completion: @escaping (_ success: Bool,_ fileLocation: URL? , _ callback : NSError?) -> Void){
  let url = myUrl.addingPercentEncoding(withAllowedCharacters:NSCharacterSet.urlQueryAllowed)!;
  var itemUrl: URL? = Foundation.URL(string: url);
@@ -86,25 +90,30 @@ import QuickLook
  completion(false, nil, error)
  }
  });
-
-
+
  downloadTask.resume();
-
-
-
-
+
  }
-
-
-
+
+ func dismissPreview(){
+ print(tempCommandId)
+ let pluginResult = CDVPluginResult(status: CDVCommandStatus_OK, messageAs: "CLOSING");
+ self.commandDelegate!.send(pluginResult, callbackId: tempCommandId);
+ }
+
 }
 
-extension PreviewAnyFile: QLPreviewControllerDataSource {
+extension PreviewAnyFile: QLPreviewControllerDataSource, QLPreviewControllerDelegate {
  func numberOfPreviewItems(in controller: QLPreviewController) -> Int {
  return 1
  }
- 
+
  func previewController(_ controller: QLPreviewController, previewItemAt index: Int) -> QLPreviewItem {
  return self.previewItem as QLPreviewItem
  }
+
+ func previewControllerWillDismiss(_ controller: QLPreviewController) {
+ self.dismissPreview();
+
+ }
 }