Question

Ok, I’ve read the articles about why it’s a better idea to use an NSRunLoop instead of an NSTimer call to run a game loop and maintain a nice frame rate.

But what I haven’t seen in any of the discussions is where to create the NSRunLoop.

Should that be put at the end of didFinishLoading?

Answer 1

The run loop is automatically generated for you when you invoke NSApplicationMain. You can access the runloop with either of the following methods:

runloop = [NSRunLoop mainRunLoop];
runloop = [NSRunLoop currentRunLoop];

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The code in the forum you linked to looks like this:

// Yield to system calls (touches, etc.) for one ms.
while (CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.002, NO) == kCFRunLoopRunHandledSource);

The documentation on CFRunLoopRunInMode:

SInt32 CFRunLoopRunInMode (   
    CFStringRef mode,
    CFTimeInterval seconds,
    Boolean returnAfterSourceHandled
);

Runs the current thread’s CFRunLoop
object in a particular mode.

Parameters

mode

The run loop mode to
run. …

seconds

The length of time to run the
run loop. …

returnAfterSourceHandled

A flag
indicating whether the run loop should
exit after processing one source. …

This means that CFRunLoopRunInMode gets the current threads run loop and processes all waiting inputs. (Like touches…).

while(… == kCFRunLoopRunHandledSource) ensures that all events are processed.

Just use the code as it is, this is working.