godot/platform/ios/app_delegate.mm

/*************************************************************************/
/*  app_delegate.mm                                                      */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
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#import "app_delegate.h"

#include "core/config/project_settings.h"
#include "drivers/coreaudio/audio_driver_coreaudio.h"
#import "godot_view.h"
#include "main/main.h"
#include "os_ios.h"
#import "view_controller.h"

#import <AVFoundation/AVFoundation.h>
#import <AudioToolbox/AudioServices.h>

#define kRenderingFrequency 60

extern int gargc;
extern char **gargv;

extern int ios_main(int, char **, String, String);
extern void ios_finish();

@implementation AppDelegate

static ViewController *mainViewController = nil;

+ (ViewController *)viewController {
	return mainViewController;
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
	// TODO: might be required to make an early return, so app wouldn't crash because of timeout.
	// TODO: logo screen is not displayed while shaders are compiling
	// DummyViewController(Splash/LoadingViewController) -> setup -> GodotViewController

	CGRect windowBounds = [[UIScreen mainScreen] bounds];

	// Create a full-screen window
	self.window = [[UIWindow alloc] initWithFrame:windowBounds];

	NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
	NSString *documentsDirectory = [paths objectAtIndex:0];
	paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
	NSString *cacheDirectory = [paths objectAtIndex:0];

	int err = ios_main(gargc, gargv, String::utf8([documentsDirectory UTF8String]), String::utf8([cacheDirectory UTF8String]));

	if (err != 0) {
		// bail, things did not go very well for us, should probably output a message on screen with our error code...
		exit(0);
		return NO;
	}

	ViewController *viewController = [[ViewController alloc] init];
	viewController.godotView.useCADisplayLink = bool(GLOBAL_DEF("display.iOS/use_cadisplaylink", true)) ? YES : NO;
	viewController.godotView.renderingInterval = 1.0 / kRenderingFrequency;

	self.window.rootViewController = viewController;

	// Show the window
	[self.window makeKeyAndVisible];

	[[NSNotificationCenter defaultCenter]
			addObserver:self
			   selector:@selector(onAudioInterruption:)
				   name:AVAudioSessionInterruptionNotification
				 object:[AVAudioSession sharedInstance]];

	mainViewController = viewController;

	// prevent to stop music in another background app
	[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryAmbient error:nil];

	return YES;
}

- (void)onAudioInterruption:(NSNotification *)notification {
	if ([notification.name isEqualToString:AVAudioSessionInterruptionNotification]) {
		if ([[notification.userInfo valueForKey:AVAudioSessionInterruptionTypeKey] isEqualToNumber:[NSNumber numberWithInt:AVAudioSessionInterruptionTypeBegan]]) {
			NSLog(@"Audio interruption began");
			OS_IOS::get_singleton()->on_focus_out();
		} else if ([[notification.userInfo valueForKey:AVAudioSessionInterruptionTypeKey] isEqualToNumber:[NSNumber numberWithInt:AVAudioSessionInterruptionTypeEnded]]) {
			NSLog(@"Audio interruption ended");
			OS_IOS::get_singleton()->on_focus_in();
		}
	}
}

- (void)applicationDidReceiveMemoryWarning:(UIApplication *)application {
	if (OS::get_singleton()->get_main_loop()) {
		OS::get_singleton()->get_main_loop()->notification(MainLoop::NOTIFICATION_OS_MEMORY_WARNING);
	}
}

- (void)applicationWillTerminate:(UIApplication *)application {
	ios_finish();
}

// When application goes to background (e.g. user switches to another app or presses Home),
// then applicationWillResignActive -> applicationDidEnterBackground are called.
// When user opens the inactive app again,
// applicationWillEnterForeground -> applicationDidBecomeActive are called.

// There are cases when applicationWillResignActive -> applicationDidBecomeActive
// sequence is called without the app going to background. For example, that happens
// if you open the app list without switching to another app or open/close the
// notification panel by swiping from the upper part of the screen.

- (void)applicationWillResignActive:(UIApplication *)application {
	OS_IOS::get_singleton()->on_focus_out();
}

- (void)applicationDidBecomeActive:(UIApplication *)application {
	OS_IOS::get_singleton()->on_focus_in();
}

- (void)dealloc {
	self.window = nil;
}

@end