Support multiple interface orientations in RCTDevLoadingView

Summary: When rotating on iPad, the dev loading view just looks clowny since it doesn't rotate properly.

Reviewed By: majak

Differential Revision: D2939721

fb-gh-sync-id: 7f1926f5cee4761cde8881e9387ae6e0063c5d6c
shipit-source-id: 7f1926f5cee4761cde8881e9387ae6e0063c5d6c

Author: javache

React/Modules/RCTDevLoadingView.m

@@ -13,6 +13,7 @@
 #import "RCTDevLoadingView.h"
 #import "RCTDefines.h"
 #import "RCTUtils.h"
+#import "RCTModalHostViewController.h"
 
 #if RCT_DEV
 
@@ -68,6 +69,9 @@ - (void)setBridge:(RCTBridge *)bridge
       _window = [[UIWindow alloc] initWithFrame:CGRectMake(0, 0, screenWidth, 22)];
       _window.windowLevel = UIWindowLevelStatusBar + 1;
 
+      // set a root VC so rotation is supported
+      _window.rootViewController = [RCTModalHostViewController new];
+
       _label = [[UILabel alloc] initWithFrame:_window.bounds];
       _label.font = [UIFont systemFontOfSize:12.0];
       _label.textAlignment = NSTextAlignmentCenter;

React/Views/RCTModalHostViewController.m

@@ -24,4 +24,14 @@ - (void)viewDidLayoutSubviews
   }
 }
 
+- (UIInterfaceOrientationMask)supportedInterfaceOrientations
+{
+  // Picking some defaults here, we should probably make this configurable
+  if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
+    return UIInterfaceOrientationMaskAll;
+  } else {
+    return UIInterfaceOrientationMaskPortrait;
+  }
+}
+
 @end