Question

I am a iOS developer and going to develop an OS X application.
However they are so different from each other.

I want to add a splash screen at the application startup.

- (void) applicationDidFinishLaunching:(NSNotification *)aNotification {

 // Hide main window
 [self.window orderOut:nil];

 SplashWindowController *splashWindowController = [[SplashWindowController alloc] initWithWindowNibName:@"SplashWindowController"];

 [NSApp runModalForWindow:splashWindowController.window];
 [splashWindowController release];

 // Show main window
 ...

And here is “SplashWindowController.m”

- (void)windowDidLoad {
  [super windowDidLoad];

  [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(hideSplash) userInfo:nil repeats:NO];
}

- (void)hideSplash {
  [NSApp endSheet:self.window];
  [self.window orderOut:nil];
}

I can see the appeared splash, but hideSplash function is never called.
What’s the reason?

Answer 1

I’m wondering that you don’t get an error, but this line has a typo:

[NSTimer scheduledTimerWithTimeInterval:2.0 target self selector:@selector(hideSplash) userInfo:nil repeats:NO];

it should be

[NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(hideSplash) userInfo:nil repeats:NO];

On the other hand, you could try this one:

NSTimer *theTimer = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(hideSplash) userInfo:nil repeats:NO];
[[NSRunLoop mainRunLoop] addTimer:theTimer forMode:NSRunLoopCommonModes];

I’m not sure if the [NSTimer…] is destroyed too soon… Assigning it to an instance should be fine. Also afaik the run loop is interrupted so you could try adding the timer to the main run loop.