Change UIButton text when clicked

Change UIButton text when clicked

My program execute the buttonPressed method and go through the if else
statement but the text on my button still does not changed. Is there
something I had missed? I even already customized it in xib but the text
of the buttonPlayMusic is remained as "Play" even it goes into the other
statement.
[viewDidLoad]
{
self.buttonPlayMusic = [UIButton buttonWithType:UIButtonTypeRoundedRect];
self.buttonPlayMusic.frame = CGRectMake(((scrollView.frame.size.width
- 200) / 2) + cx, 360, 200, 50);
[self.buttonPlayMusic setTitle:@"Play" forState:UIControlStateNormal];
[self.buttonPlayMusic addTarget:self action:@selector(buttonPressed:)
forControlEvents:UIControlEventTouchUpInside];
self.toggleButonPlayMusic = YES; //YES to play, NO to stop music
[scrollView addSubview:self.buttonPlayMusic];
}
-(IBAction)buttonPressed:(id)sender{
NSLog(@"SSS");
if (self.toggleButonPlayMusic == YES) {
[self.buttonPlayMusic setTitle:@"Stop" forState:UIControlStateNormal];
self.toggleButonPlayMusic = NO;
NSLog(@"RRR");
}else{
[self.buttonPlayMusic setTitle:@"Play" forState:UIControlStateNormal];
self.toggleButonPlayMusic = YES;
NSLog(@"ZZZ");
}
}