Warn when displaying a modal with unsupported interface orientations

Summary: In dev mode, this removes all iOS crashes from specifying the incorrect interface orientations. It also includes okay-ish instructions for how to fix the problem.

Reviewed By: fkgozali

Differential Revision: D3904998

fbshipit-source-id: 699599fa77fd87e6615436250e38944e577e75a0

React/Views/RCTModalHostViewController.m

@@ -9,6 +9,7 @@
 
 #import "RCTModalHostViewController.h"
 
+#import "RCTLog.h"
 #import "RCTModalHostView.h"
 
 @implementation RCTModalHostViewController
@@ -50,4 +51,21 @@
   return _preferredStatusBarHidden;
 }
 
+#if RCT_DEV
+- (UIInterfaceOrientationMask)supportedInterfaceOrientations
+{
+  UIInterfaceOrientationMask appSupportedOrientationsMask = [[UIApplication sharedApplication] supportedInterfaceOrientationsForWindow:[[UIApplication sharedApplication] keyWindow]];
+  if (!(_supportedInterfaceOrientations & appSupportedOrientationsMask)) {
+    RCTLogError(@"Modal was presented with 0x%x orientations mask but the application only supports 0x%x."
+                @"Add more interface orientations to your app's Info.plist to fix this."
+                @"NOTE: This will crash in non-dev mode.",
+                (unsigned)_supportedInterfaceOrientations,
+                (unsigned)appSupportedOrientationsMask);
+    return UIInterfaceOrientationMaskAll;
+  }
+
+  return _supportedInterfaceOrientations;
+}
+#endif
+
 @end