app/internal/window,cmd/gogio: [iOS] export GioViewController

The Gio GioAppDelegate created the GioViewController programmatically.
When using gogio's -buildmode=archive users may want to use a different
method (for example storyboards) but there can only be one app delegate.

Move the GioAppDelegate to gogio's exe buildmode, and export the
GioViewController for embedding use.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

cmd/gogio/iosbuild.go

@@ -163,6 +163,20 @@ func exeIOS(tmpDir, target, app string, bi *buildInfo) error {
 	const mainmSrc = `@import UIKit;
 @import Gio;
 
+@interface GioAppDelegate : UIResponder <UIApplicationDelegate>
+@property (strong, nonatomic) UIWindow *window;
+@end
+
+@implementation GioAppDelegate
+- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+	self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
+	GioViewController *controller = [[GioViewController alloc] initWithNibName:nil bundle:nil];
+	self.window.rootViewController = controller;
+	[self.window makeKeyAndVisible];
+	return YES;
+}
+@end
+
 int main(int argc, char * argv[]) {
 	@autoreleasepool {
 		return UIApplicationMain(argc, argv, nil, NSStringFromClass([GioAppDelegate class]));