Round two corners in UIView

- (void)drawRect:(CGRect)rect {
    //[super drawRect:rect]; 

- (void)viewDidLoad {

    // set the radius
    CGFloat radius = 50.0;
    // set the mask frame, and increase the height by the 
    // corner radius to hide bottom corners
    CGRect maskFrame = self.view.bounds;
    maskFrame.size.height += radius;
    // create the mask layer
    CALayer *maskLayer = [CALayer layer];
    maskLayer.cornerRadius = radius;
    maskLayer.backgroundColor = [UIColor blackColor].CGColor;
    maskLayer.frame = maskFrame;

    // set the mask
    self.view.layer.mask = maskLayer;

    // Add a backaground color just to check if it works
    self.view.backgroundColor = [UIColor redColor];
    // Add a test view to verify the correct mask clipping
    UIView *testView = [[UIView alloc] initWithFrame:CGRectMake( 0.0, 0.0, 50.0, 50.0 )];
    testView.backgroundColor = [UIColor blueColor];
    [self.view addSubview:testView];
    [testView release];

    [super viewDidLoad];
}