Add a hide method for iOS

Need to be able to dismiss the preview from JS so that if the app is backgrounded while the preview is up.. the app can dismiss the preview to show the passcode entry screen, etc.

Author: devgeeks

src/ios/FileViewerPlugin.h

@@ -1,6 +1,12 @@
 #import <Cordova/CDV.h>
+#import "FileViewerPluginViewController.h"
 
 @interface FileViewerPlugin : CDVPlugin
+{
+    FileViewerPluginViewController* previewViewController;
+}
+
+@property (retain, nonatomic) FileViewerPluginViewController* previewViewController;
 
 - (void)view:(CDVInvokedUrlCommand*)command;
 - (void)share:(CDVInvokedUrlCommand*)command;

src/ios/FileViewerPlugin.m

@@ -1,8 +1,8 @@
 #import "FileViewerPlugin.h"
-#import "FileViewerPluginViewController.h"
 #import <Cordova/CDV.h>
 
 @implementation FileViewerPlugin
+@synthesize previewViewController;
 
 - (void)view:(CDVInvokedUrlCommand*)command
 {
@@ -12,13 +12,18 @@ - (void)view:(CDVInvokedUrlCommand*)command
     NSDictionary* arguments = [command.arguments objectAtIndex:0];
     NSString* filePath = [arguments objectForKey:@"url"];
 
-    FileViewerPluginViewController* viewController = [[FileViewerPluginViewController alloc] init];
-    pluginSuccess = [viewController viewFile:filePath usingViewController:[super viewController]];
+    self.previewViewController = [[FileViewerPluginViewController alloc] init];
+    pluginSuccess = [self.previewViewController viewFile:filePath usingViewController:[super viewController]];
 
     pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_OK messageAsBool:pluginSuccess];
     [self.commandDelegate sendPluginResult:pluginResult callbackId:command.callbackId];
 }
 
+- (void)hide:(CDVInvokedUrlCommand*)command
+{
+    [self.previewViewController.documentInteractionController dismissPreviewAnimated:YES];
+}
+
 - (void)share:(CDVInvokedUrlCommand*)command
 {
     NSDictionary* arguments = [command.arguments objectAtIndex:0];

www/FileViewerPlugin.js

@@ -19,6 +19,11 @@
       }, 'FileViewerPlugin', 'view', [params]);
   };
 
+  // Only really useful on iOS
+  FileViewerPlugin.prototype.hide = function() {
+    return exec(null, null, 'FileViewerPlugin', 'hide', []);
+  };
+
   FileViewerPlugin.prototype.share = function(params, success, fail) {
     return exec(function(args) {
         success(args);