add presenting view controller parameter

UPPlatformSDK/UPPlatformSDK/UPAuthViewController.h

@@ -25,7 +25,7 @@
 @interface UPAuthViewController : UINavigationController
 
 - (id)initWithURL:(NSURL *)url delegate:(id<UPAuthViewControllerDelegate>)delegate;
-- (void)show;
+- (void)presentWithViewController:(UIViewController*)presentingViewController;
 
 @end
 #endif

UPPlatformSDK/UPPlatformSDK/UPAuthViewController.m

@@ -80,9 +80,13 @@
     self.webView.backgroundColor = [UIColor whiteColor];
 }
 
-- (void)show
+- (void)presentWithViewController:(UIViewController*)presentingViewController;
 {
-    [self.rootViewController presentViewController:self animated:YES completion:^{
+    if (presentingViewController == nil) {
+        presentingViewController = self.rootViewController;
+    }
+    
+    [presentingViewController presentViewController:self animated:YES completion:^{
         [self.webView loadRequest:[NSURLRequest requestWithURL:self.authURL]];
     }];
 }

UPPlatformSDK/UPPlatformSDK/UPPlatform.h

@@ -178,6 +178,20 @@ typedef void(^UPPlatformRequestCompletion)(UPURLRequest *request, UPURLResponse
  */
 - (void)startSessionWithClientID:(NSString *)clientID clientSecret:(NSString *)clientSecret authScope:(UPPlatformAuthScope)authScope redirectURI:(NSString *)redirectURI completion:(UPPlatformSessionCompletion)completion;
 
+/**
+ *  Starts a user's session.
+ *
+ *  This will present a UIWebView to perform the OAuth authentication flow, taking care of getting the access token for HTTP requests.
+ *
+ *  @param clientID     The client ID provided during application signup.
+ *  @param clientSecret The client secret provided during application signup.
+ *  @param authScope    Options to request specific auth scopes during authentication. Defaults to UPPlatformAuthScopeBasicRead.
+ *  @param redirectURI  An alternate redirect URI used during authentication. This is not common.
+ *  @param presentingViewController  View controller to present authentication view controller. Uses the window root view controller if nil.
+ *  @param completion   The session completion block.
+ */
+- (void)startSessionWithClientID:(NSString *)clientID clientSecret:(NSString *)clientSecret authScope:(UPPlatformAuthScope)authScope redirectURI:(NSString *)redirectURI presentingViewController:(UIViewController*)presentingViewController completion:(UPPlatformSessionCompletion)completion;
+
 #endif
 
 /**

UPPlatformSDK/UPPlatformSDK/UPPlatform.m

@@ -302,6 +302,11 @@ decisionListener:(id<WebPolicyDecisionListener>)listener
 }
 
 - (void)startSessionWithClientID:(NSString *)clientID clientSecret:(NSString *)clientSecret authScope:(UPPlatformAuthScope)authScope redirectURI:(NSString *)redirectURI completion:(UPPlatformSessionCompletion)completion
+{
+    [self startSessionWithClientID:clientID clientSecret:clientSecret authScope:authScope redirectURI:redirectURI presentingViewController:nil completion:completion];
+}
+
+- (void)startSessionWithClientID:(NSString *)clientID clientSecret:(NSString *)clientSecret authScope:(UPPlatformAuthScope)authScope redirectURI:(NSString *)redirectURI presentingViewController:(UIViewController*)presentingViewController completion:(UPPlatformSessionCompletion)completion
 {
     self.sessionCompletion = completion;
     self.clientID = clientID;
@@ -328,7 +333,7 @@ decisionListener:(id<WebPolicyDecisionListener>)listener
     NSMutableString *authURLString = [NSMutableString stringWithFormat:@"%@/auth/oauth2/auth?response_type=code&client_id=%@&scope=%@&redirect_uri=%@", [UPPlatform basePlatformURL], self.clientID, [self stringFromAuthScope:authScope], redirectURI];
     
     self.authViewController = [[UPAuthViewController alloc] initWithURL:[NSURL URLWithString:authURLString] delegate:self];
-    [self.authViewController show];
+    [self.authViewController presentWithViewController:presentingViewController];
 }
 
 #endif