Loading presentModalViewController in ViewDidAppear causes EXC_BAD_ACCESS - objective-c

Question

In the Follwoing ViewControllerClass I get EXC_BAD_ACCESS when trying to call presentModalViewController in ViewDidAppear method.
#import "SounderViewController.h"
#import "ASIFormDataRequest.h"
#import "ASIHTTPRequest.h"
#import "JSON.h"
#import "InfoViewController.h"
#implementation SounderViewController
#synthesize ipod;
#synthesize ivc;
#synthesize title_lb, artist_lb, check;
-(IBAction)showCurrentSongInfo{
MPMediaItem * song = [ipod nowPlayingItem];
NSString * title = [song valueForProperty:MPMediaItemPropertyTitle];
NSString * artist = [song valueForProperty:MPMediaItemPropertyArtist];
title_lb.text = title;
artist_lb.text = artist;
}
-(void)playbackStateChanged: (NSNotification*) notification{
[self showCurrentSongInfo];
NSLog(#"Playback state: %#",[notification name]);
if (ipod.playbackState != MPMusicPlaybackStatePlaying) {
NSLog(#"Is not playing");
[self presentModalViewController:self.ivc animated:YES];
}else if (ipod.playbackState == MPMusicPlaybackStatePlaying) {
NSLog(#"Is playing");
[self dismissModalViewControllerAnimated:YES];
}
}
-(void)nowPlayingItemChanged: (NSNotification*) notification{
[self showCurrentSongInfo];
NSLog(#"Playing item changed: %#",[notification name]);
}
- (void)viewDidLoad {
[super viewDidLoad];
self.ivc = [[InfoViewController alloc] initWithNibName:#"InfoViewController" bundle:nil];
self.ipod = [MPMusicPlayerController iPodMusicPlayer];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector (playbackStateChanged:)
name:#"MPMusicPlayerControllerPlaybackStateDidChangeNotification"
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector (nowPlayingItemChanged:)
name:#"MPMusicPlayerControllerNowPlayingItemDidChangeNotification"
object:nil];
[[MPMusicPlayerController iPodMusicPlayer] beginGeneratingPlaybackNotifications];
}
-(void)viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
if (ipod.playbackState != MPMusicPlaybackStatePlaying) {
[self presentModalViewController:self.ivc animated:YES];
}else{
[self showCurrentSongInfo];
}
}
-(IBAction)showInfoView{
[self presentModalViewController:self.ivc animated:YES];
}
#pragma mark View Methods
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[super dealloc];
}
#end
Method call
[self presentModalViewController:self.ivc animated:YES];
in ViewDidAppear causes EXC_BAD_ACCESS.
I have tried debuging it with NSZombieEnabled but got only a stack call to main.
The thing that gets me crazy is that if the same code is run from method playbackStateChanged it works fine.
If any of you can help I wan't get bold as quick. Thanks.

Answer 1

I finally made it to work! But I think it's just quick fix.
So I found out that to make my ivc to show up I need to delay the call to presentModalViewController
[self performSelector:#selector(showWaitingMessageView:) withObject:self.ivc afterDelay:1];
That's it. It works.
I don't know why this helped, so if one of you gurus knows more about it please enlighten me.