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    <p>For my own iOS projects, I use the classic approach (create a window .nib, create a class inheriting <code>EAGLView</code>, add <code>EAGLView</code> to a view in a view controller which is placed in its own .nib). </p> <p>At work, I took a slightly different approach inspired by SDL, which you can inspect in our opensourced library, <a href="http://libapril.sf.net/" rel="noreferrer">APRIL</a>. Main goal of APRIL is support for as many platforms as possible, while retaining simplicity (window and input management only) and being clear about licensing issues and free to use. Our developers want to write apps on one platform (Windows, Mac or Linux, according to tastes and desires) and then the code is handed over to me to adapt for other platforms. </p> <p>In the approach we use in APRIL, you don't create any .nibs, and upon calling <code>UIApplicationMain</code>, you specify the delegate class as its fourth argument. Main code of game remains absolutely the same for each platform, and only platform-specific stuff is <code>#ifdef</code>'d into the code, or abstracted in a helper library.</p> <p>In the app delegate you create the view controller and the window:</p> <pre><code>- (void)applicationDidFinishLaunching:(UIApplication *)application { // create a window. // early creation so Default.png can be displayed while we're waiting for // game initialization window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; // viewcontroller will automatically add imageview viewController = [[AprilViewController alloc] initWithWindow:window]; [viewController loadView]; // set window color [window setBackgroundColor:[UIColor blackColor]]; // display the window [window makeKeyAndVisible]; // thanks to Kyle Poole for this trick // also used in latest SDL // quote: // KP: using a selector gets around the "failed to launch application in time" if the startup code takes too long // This is easy to see if running with Valgrind [self performSelector:@selector(runMain:) withObject:nil afterDelay:0.2f]; } </code></pre> <p>Notice how we delay launching by 0.2? That's why I mention image view above. During those 0.2 seconds, we'd have blank screen displayed immediately after Default.png, and extra delay is introduced before control is transferred to runMain:, which releases control to the main app:</p> <pre><code>- (void)runMain:(id)sender { // thanks to Kyle Poole for this trick char *argv[] = {"april_ios"}; int status = april_RealMain (1, argv); //gArgc, gArgv); #pragma unused(status) } </code></pre> <p>So, now the control is never transferred back to UIApplication's actual main loop. You then create your own main loop.</p> <pre><code> void iOSWindow::enterMainLoop() { while (mRunning) { // parse UIKit events doEvents(); handleDisplayAndUpdate(); } } void iOSWindow::doEvents() { SInt32 result; do { result = CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0, TRUE); } while(result == kCFRunLoopRunHandledSource); } </code></pre> <p>(On a side note, view controller is used, of course, to simplify rotation of UI to match device orientation.)</p> <p>Both of these approaches use <code>CADisplayLink</code> if supported by the OS. I have not noticed any issues with either of the methods, although my private projects are primarily accelerometer based. I suspect APRIL approach might make some of the problems go away, too.</p>
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    1. POiOS Games and Run-Loop Management
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    1. USIvan Vučica
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    1. COThat is really fascinating Ivan. In fact you have described how to achieve .. *control is transferred away from UIApplication's actual main loop. You then create your own main loop* ... Awesome! Wonderful!
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    2. COit looks like you're doing things similar to the way we were, that is, getting rid of the .nib, etc. I find your "doEvents" method v. interesting, though, as my intuition tells me the problems I'm getting are in event handling. I'm going to have to experiment with that one. I'm also interesting in how you're initiating things in APRIL. For my loop initialization when I ran things in my own run loop I simply spawned another thread and managed things that way, and that worked great except for the software interrupt kicking in on the wrong thread.
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