toggle between UIBarButtonSystemItemPlay and UIBarButtonSystemItemPause

Question

Have two UIBarButtonItems want to make it as one UIBarButtonItem and toggle between them

UIBarButtonItem *systemItem1 = [[UIBarButtonItem alloc]
                   


        

Answer 1

I had a much simpler solution to that issue:

- (void) setStartStopButton:(BOOL)startorstop
{
    UIBarButtonItem *startStopButton = nil;
    if (startorstop == YES) {
        startStopButton = [[UIBarButtonItem alloc]     initWithBarButtonSystemItem:UIBarButtonSystemItemPause target:self action:@selector(startStopAction:)];
    }
    else
    {
        startStopButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemPlay target:self action:@selector(startStopAction:)];
    }
    self.navigationItem.rightBarButtonItem = startStopButton;
    [startStopButton release];
}

- (IBAction)startStopAction:(id)sender
{
    if (task.isActive) 
    {
        [task stopTask];
    }
    else
    {
        [task startTask];
    }
    [self setStartStopButton:task.isActive];
}

And then I call the first method to set the button in viewWillAppear as well to set the button before the view appears onscreen.

Answer 2

Essentially, every time the play/pause status is updated, you're going to want to run a method to update the toolbar. Something like this should work. You can create a method like this:

-(void)playPause{
      if(audioPlayer == nil){
          NSString *filePath = [[NSBundle mainBundle] pathForResource:@"theme" ofType:@"mp3"];
          NSURL *fileURL = [[NSURL alloc] initFileURLWithPath:filePath];
          audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL error:nil];
          audioPlayer.currentTime = 0;
          [fileURL release];
      }
      UIBarButtonSystemItem buttontype = UIBarButtonSystemItemPlay;
      if([audioPlayer isPlaying]){
          [audioPlayer pause];
      }
      else {
          [audioPlayer play];
          buttontype = UIBarButtonSystemItemPause;
      }
      UIBarButtonSystemItem *item = [[[UIBarButtonItem alloc]
                           initWithBarButtonSystemItem:buttontype 
                           target:self 
                           action:@selector(playPause)] autorelease];
      self.toolbar.items = [NSArray arrayWithObject:item];
}