View controller with pan, rotate, and pinch

MainViewController.m

@interface MainViewController ()

@property CGAffineTransform scale;
@property CGAffineTransform rotate;
@property CGAffineTransform translate;

@end

@implementation MainViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    UIView* view = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 200, 200)];
    view.backgroundColor = [UIColor blackColor];
    
    UIPinchGestureRecognizer* pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(onPinch:)];
    pinch.delegate = self;
    [view addGestureRecognizer:pinch];
    
    
    UIRotationGestureRecognizer* rotate = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(onRotate:)];
    rotate.delegate = self;
    [view addGestureRecognizer:rotate];
    
    [self.view addSubview:view];
    
    UIPanGestureRecognizer* pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(onPan:)];
    pan.delegate = self;
    pan.minimumNumberOfTouches = 1;
    pan.maximumNumberOfTouches = 2;
    [view addGestureRecognizer:pan];
    
    self.rotate = CGAffineTransformMakeRotation(0);
    self.translate = CGAffineTransformMakeTranslation(0, 0);
    self.scale = CGAffineTransformMakeScale(1.0, 1.0);
}

-(void)onPinch:(UIPinchGestureRecognizer*)recognizer
{
    self.scale = CGAffineTransformMakeScale(recognizer.scale, recognizer.scale);
    [self update:recognizer.view];
}

-(void)onRotate:(UIRotationGestureRecognizer*)recognizer
{
    self.rotate = CGAffineTransformMakeRotation(recognizer.rotation);
    [self update:recognizer.view];
}

-(void)onPan:(UIPanGestureRecognizer*)recognizer
{
    self.translate = CGAffineTransformTranslate(self.translate,[recognizer translationInView:self.view].x , [recognizer translationInView:self.view].y);
    [recognizer setTranslation:CGPointZero inView:self.view];
    [self update:recognizer.view];
}

-(void)update:(UIView*)view
{
    view.transform = CGAffineTransformConcat(self.rotate, CGAffineTransformConcat(self.scale, self.translate));
}

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}

@end