How to add a border to this delimited layer? - ios

Question

I have an image above which I delimitate a transparent rectangle using layer and mask.
I would like this transparent rectangle to be red bordered. But I could find a way to achieve this :
Here is what I have done :
My ViewController has a darkenedView property.
- (void)loadView {
UIView *const rootView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 50, 50)];
rootView.backgroundColor = [UIColor whiteColor];
self.view = rootView;
[self addContentSubviews];
}
- (void)addContentSubviews {
UIImageView *const imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"DSC_0823.jpg"]];
imageView.contentMode = UIViewContentModeScaleAspectFill;
imageView.frame = self.view.bounds;
imageView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
[self.view addSubview:imageView];
}
- (void)viewDidLoad {
[super viewDidLoad];
[self addDarkenedSubview];
}
- (void)viewDidLayoutSubviews {
CGRect const bounds = self.view.bounds;
darkenedView.center = CGPointMake(CGRectGetMidX(bounds), 0);
}
- (void)addDarkenedSubview {
darkenedView = [[UIView alloc] initWithFrame:CGRectMake(10, 30, 400, 1200)];
darkenedView.backgroundColor = [UIColor colorWithWhite:0.0 alpha:0.6];
darkenedView.autoresizingMask = 0;
[self.view addSubview:darkenedView];
[self addMaskToDarkenedView];
}
- (void)addMaskToDarkenedView {
CGRect bounds = darkenedView.bounds;
CAShapeLayer *maskLayer = [CAShapeLayer layer];
maskLayer.frame = bounds;
CGRect const myRect = CGRectMake(CGRectGetMidX(bounds) - 100,
CGRectGetMidY(bounds) + 100,
200, 200);
UIBezierPath *path = [UIBezierPath bezierPathWithRect:myRect];
[path appendPath:[UIBezierPath bezierPathWithRect:bounds]];
maskLayer.path = path.CGPath;
maskLayer.fillRule = kCAFillRuleEvenOdd;
darkenedView.layer.mask = maskLayer;
}
I've tried without success :
maskLayer.strokeColor = [UIColor redColor].CGColor;
maskLayer.lineWidth = 3.0f;

Answer 1

Instead of giving stroke to maskLayer object create CAShapeLayer and addSublayer to darkenedView view below is sample code Hope it help
CAShapeLayer *shape = [CAShapeLayer layer];
shape.frame = darkenedView.bounds;
shape.path = path.CGPath;
shape.lineWidth = 3.0f;
shape.strokeColor = [UIColor redColor].CGColor;
shape.fillColor = [UIColor clearColor].CGColor;
[darkenedView.layer addSublayer:shape];