Move component with UIPanGestureRecognizer

panGesture.m

- (void)viewDidLoad {
  [super viewDidLoad];

  UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
  [button setTitle:@"BUTTON" forState:UIControlStateNormal];
  [button setFrame:CGRectMake(50, 50, 150, 150)];
  
  [self.view addSubview:button];
  
  UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(invokePanGesture:)];
  [panGesture setMinimumNumberOfTouches:1];
  [panGesture setMaximumNumberOfTouches:2];
  
  [button addGestureRecognizer:panGesture];
}

- (void)invokePanGesture:(UIPanGestureRecognizer*)recognizer {
  CGPoint translation = [recognizer translationInView:self.view];
  recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x, 
                                       recognizer.view.center.y + translation.y);
  [recognizer setTranslation:CGPointMake(0, 0) inView:self.view];
}