Support rotation in RCTModalHostView

Summary: When rotating a modal view we should adjust the root view's frame.

Reviewed By: majak

Differential Revision: D2939712

fb-gh-sync-id: 974634276d2c0ad22b46976020d0a21e1dac9026
shipit-source-id: 974634276d2c0ad22b46976020d0a21e1dac9026

React/Views/RCTModalHostView.m

@@ -58,13 +58,17 @@ RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:coder)
 
 - (void)insertReactSubview:(UIView *)subview atIndex:(__unused NSInteger)atIndex
 {
+  RCTAssert([_modalViewController.view reactTag] == nil, @"Modal view can only have one subview");
   [subview addGestureRecognizer:_touchHandler];
+  subview.autoresizingMask = UIViewAutoresizingFlexibleHeight |
+                             UIViewAutoresizingFlexibleWidth;
   _modalViewController.view = subview;
 }
 
 - (void)removeReactSubview:(UIView *)subview
 {
   RCTAssert(subview == _modalViewController.view, @"Cannot remove view other than modal view");
+  [subview removeGestureRecognizer:_touchHandler];
   _modalViewController.view = nil;
 }