//渐变层

    CAGradientLayer *gradientLayer = [CAGradientLayer layer];

    gradientLayer.frame = CGRectMake(, , kWidth, kWidth);

    gradientLayer.colors = @[(__bridge id)[[UIColor redColor]colorWithAlphaComponent:0.4] .CGColor,

                             (__bridge id)[UIColor clearColor].CGColor];

    gradientLayer.startPoint = CGPointMake(, );

    gradientLayer.endPoint  = CGPointMake(, );

    [self.view.layer addSublayer:gradientLayer];

    //

    UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(, , , )];

    CAShapeLayer *layer = [CAShapeLayer layer];

    layer.frame = self.view.bounds;

    layer.lineWidth = ;

    layer.strokeColor = [UIColor redColor].CGColor;

    layer.fillColor = [UIColor redColor].CGColor;

    layer.path = path.CGPath;

    layer.lineCap = @"round";

//    [gradientLayer addSublayer:layer];

    gradientLayer.mask = layer;
    

   UIImageView *imageView1 = [[UIImageView alloc]initWithFrame:self.view.bounds];

    imageView1.image = [UIImage imageNamed:@""];

    [self.view addSubview:imageView1];

    TestView *view = [TestView new];

    view.frame = self.view.bounds;

    view.backgroundColor = [[UIColor lightGrayColor] colorWithAlphaComponent:0.9];

    [self.view addSubview:view];

    UIImageView *imageView = [[UIImageView alloc]initWithFrame:self.view.bounds];

    imageView.image = [UIImage imageNamed:@""];

    [self.view addSubview:imageView];

    UIView *roundView = [[UIView alloc]initWithFrame: CGRectMake(, , , )];

    roundView.backgroundColor = [UIColor redColor];

    _viewwww = roundView;

    imageView.maskView = roundView;