app: [iOS] replace ViewEvent.View with add ViewController field

For mixing native UI with Gio UI, the UIViewController is sometimes
needed, not just the UIView. This change replace the View field of
ViewEvent with ViewController.

Signed-off-by: Inkeliz <inkeliz@inkeliz.com>

app/os_ios.go

@@ -87,8 +87,8 @@ import (
 )
 
 type ViewEvent struct {
-	// View is a CFTypeRef for the UIView backing a Window.
-	View uintptr
+	// ViewController is a CFTypeRef for the UIViewController backing a Window.
+	ViewController uintptr
 }
 
 type window struct {
@@ -112,7 +112,7 @@ func init() {
 }
 
 //export onCreate
-func onCreate(view C.CFTypeRef) {
+func onCreate(view, controller C.CFTypeRef) {
 	w := &window{
 		view: view,
 	}
@@ -128,7 +128,7 @@ func onCreate(view C.CFTypeRef) {
 	w.w.SetDriver(w)
 	views[view] = w
 	w.w.Event(system.StageEvent{Stage: system.StagePaused})
-	w.w.Event(ViewEvent{View: uintptr(view)})
+	w.w.Event(ViewEvent{ViewController: uintptr(controller)})
 }
 
 //export gio_onDraw

app/os_ios.m

@@ -30,7 +30,7 @@ CGFloat _keyboardHeight;
 #endif
 	drawView.preservesSuperviewLayoutMargins = YES;
 	drawView.layoutMargins = UIEdgeInsetsMake(0, 0, 0, 0);
-	onCreate((__bridge CFTypeRef)drawView);
+	onCreate((__bridge CFTypeRef)drawView, (__bridge CFTypeRef)self);
 	[[NSNotificationCenter defaultCenter] addObserver:self
 											 selector:@selector(keyboardWillChange:)
 												 name:UIKeyboardWillShowNotification