Question

I am creating a music player application and it need that 2 actions to be called from a single button, one to skip to next track by touch up inside event and other to fast forward the curenttrack incase of a ‘long press’. I don’t know which event is pointing to this long press, i thought it to be touch down, but it worked only while holding the button. When i released the button, the track was skipped to next item. pls help

AVAudioPlayer *appSoundPlayer;// declared in .h file

In m file, the method:

-(void)seekForwards{
NSTimeInterval timex;
timex = appSoundPlayer.currentTime;
        timex = timex+5; // forward 5 secs

        appSoundPlayer.currentTime = timex;
        timex = 0;
}

Answer 1

Personally I’d just track the button’s state with an integer on your view controller or within a button subclass. If you track what the button is doing you can control what each of the actions do. In your .h file put in some stuff like this:

enum {
    MyButtonScanning,
    MyButtonStalling,
    MyButtonIdle
};



@interface YourClass : UIViewController {
    NSInteger buttonModeAt;
}
@property (nonatomic) NSInteger buttonModeAt;
-(IBAction)buttonPushedDown:(id)sender;
-(void)tryScanForward:(id)sender;
-(IBAction)buttonReleasedOutside:(id)sender;
-(IBAction)buttonReleasedInside:(id)sender;
@end

And then in your .m file throw in some of this stuff:

@implementation YourClass
///in your .m file
@synthesize buttonModeAt;


///link this to your button's touch down
-(IBAction)buttonPushedDown:(id)sender {
    buttonModeAt = MyButtonStalling;
    [self performSelector:@selector(tryScanForward:) withObject:nil afterDelay:1.0];
}

-(void)tryScanForward:(id)sender {
    if (buttonModeAt == MyButtonStalling) {
        ///the button was not released so let's start scanning
        buttonModeAt = MyButtonScanning;

        ////your actual scanning code or a call to it can go here
        [self startScanForward];
    }
}

////you will link this to the button's touch up outside
-(IBAction)buttonReleasedOutside:(id)sender {
    if (buttonModeAt == MyButtonScanning) {
        ///they released the button and stopped scanning forward
        [self stopScanForward];
    } else if (buttonModeAt == MyButtonStalling) {
        ///they released the button before the delay period finished
        ///but it was outside, so we do nothing
    }

    self.buttonModeAt = MyButtonIdle;
}

////you will link this to the button's touch up inside
-(IBAction)buttonReleasedInside:(id)sender {
    if (buttonModeAt == MyButtonScanning) {
        ///they released the button and stopped scanning forward
        [self stopScanForward];
    } else if (buttonModeAt == MyButtonStalling) {
        ///they released the button before the delay period finished so we skip forward
        [self skipForward];
    }

    self.buttonModeAt = MyButtonIdle;

}

After that just link the button’s actions to what I’ve noted in the comments before the IBactions. I haven’t tested this but it should work.