gistfile1.m

- (void)loadView {
    [super loadView];
    
    NSLog(@"load view");
    
    self.starButton.layer.cornerRadius = 20; // this value vary as per your desire
    self.starButton.clipsToBounds = YES;
}

- (IBAction)mixButtonPressed:(id)sender {
    
    NSLog(@"mix it!");
    
}