How to show tint colored image in CALayer on iOS?

Adding an answer based on J.Williams's answer - but updated for Swift 5, using a system image. Included all the layer setting up, etc. Hope this is useful! (Note: I think it's ridiculous that we can't just change the tint on an UIImage in a layer without jumping through a lot of crazy hoops like this)

    let image = UIImage(systemName: "plus.circle.fill")
    let circleLayer = CAShapeLayer()
    let circleDiameter: CGFloat = 20.0
    circleLayer.frame = CGRect(x: x - (circleDiameter / 2),
                               y: y - (circleDiameter / 2),
                               width: circleDiameter, height: circleDiameter)
    let maskLayer = CALayer()
    maskLayer.frame = circleLayer.bounds
    maskLayer.contents = image?.cgImage
    circleLayer.mask = maskLayer
    circleLayer.backgroundColor = UIColor.systemPurple.cgColor
    myView.layer.addSublayer(circleLayer)

I think my solution is far less cumbersome:

let maskLayer = CALayer()
maskLayer.frame = layer.bounds
maskLayer.contents = tintedImage.CGImage
layer.mask = maskLayer
layer.backgroundColor = UIColor.redColor().CGColor

let me know if it works fine:)

I guess that is possible on OSX using the filter property of CALayer, but in ios is not used. I think you should redraw the image totally, here is a sample code, it tints everything that has alpha > 0.

- (UIImage *)tintedImageWithColor:(UIColor *)tintColor blendingMode:(CGBlendMode)blendMode highQuality:(BOOL) yerOrNo;
{
    UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.0f);
    if (yerOrNo) {
        CGContextRef context = UIGraphicsGetCurrentContext();
        CGContextSetShouldAntialias(context, true);
        CGContextSetAllowsAntialiasing(context, true);
        CGContextSetInterpolationQuality(context, kCGInterpolationHigh);
    }
    [tintColor setFill];
    CGRect bounds = CGRectMake(0, 0, self.size.width, self.size.height);
    UIRectFill(bounds);
    [self drawInRect:bounds blendMode:blendMode alpha:1.0f];

    if (blendMode != kCGBlendModeDestinationIn)
        [self drawInRect:bounds blendMode:kCGBlendModeDestinationIn alpha:1.0];

    UIImage *tintedImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return tintedImage;
}

I've found this snippet on the internet but I don't remember where.