// Include VolumeControl.h into your ViewController. // Don’t forget to set your delegate: @interface ViewController () <VolumeControlDelegate> @property (nonatomic, strong)VolumeControl *control; self.control = [[VolumeControl alloc] initWithCenter:CGPointMake(screen.size.width, screen.size.height) withRadius:screen.size.width*0.50 withVolume:self.volume/100 withVolumeControlDelegate:self]; [self.myView addSubview: control]; // VolumeControl animates from the bottom-right corner of the screen thus it will need either the UIButton or UIView to show the controller. - (IBAction)onVolumeButton:(id)sender { [self.control setHidden:NO]; }