Why does my performSelector method do nothing in my new thread?

Question

I've started a new thread like this:

[NSThread detachNewThreadSelector:@selector(doStuffInThread) toTarget:self withObject:nil];

The thread starts in this method, which performs some delayed stuff:

- (void)doStuffInThread {
    [self performSelector:@selector(delayedMethod) withObject:nil afterDelay:2.0];
}

And then, I check in console if something happened. But nothing happens:

- (void)delayedMethod {
    NSLog(@"it happened!");
}

I don't get an error. But the console stays empty. Is there something wrong with my threading code?

Answer 1

Here is an example from one of my programs.

- (void)viewDidLoad {
    [super viewDidLoad];
    [NSThread detachNewThreadSelector:@selector(loopSongs) toTarget:self withObject:nil];
}

- (void) loopSongs {
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    //do your stuff here 

    [pool release];
}

---

You don't need the colon after @selector(delayedMethod:) because you don't have any parameters in your method that you are calling.

Answer 2

Your background thread's run loop may be terminating before your delayed selector has a chance to execute. Because you won't be blocking the UI on the main thread, you could forgo the delayed selector and instead do something like this:

- (void)doStuffInThread {
    [NSThread sleepForTimeInterval:2.0];
    // Delayed action
}