@interface ViewController ()

@property (nonatomic, strong) CALayer *colorLayer;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.colorLayer = [CALayer layer];
    self.colorLayer.frame = CGRectMake(0, 0, 100, 100);
    self.colorLayer.position = CGPointMake(self.view.bounds.size.width / 2, self.view.bounds.size.height / 2);
    self.colorLayer.backgroundColor = [UIColor redColor].CGColor;
    [self.view.layer addSublayer:self.colorLayer];
    
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    CGPoint point = [[touches anyObject] locationInView:self.view];
    if ([self.colorLayer.presentationLayer hitTest:point]) {
        CGFloat red = arc4random() / (CGFloat)INT_MAX;
        CGFloat green = arc4random() / (CGFloat)INT_MAX;
        CGFloat blue = arc4random() / (CGFloat)INT_MAX;
        self.colorLayer.backgroundColor = [UIColor colorWithRed:red green:green blue:blue alpha:1.0].CGColor;
    } else {
        [CATransaction begin];
        [CATransaction setAnimationDuration:4.0];
        self.colorLayer.position = point;
        [CATransaction commit];
    }
}