UIImage from CALayer in iOS

Question

In my application, I have created a CALayer (with a few sublayers - the CALayer is composed of shapes added as sublayers).

I am trying to create a UIImage that I will be able to upload to a server (I have the code for this). However, I can't figure out how to add the CALayer to a UIImage.

Is this possible?

Answer 1

Sounds like you want to render your layer into a UIImage. In that case, the method below should do the trick. Just add this to your view or controller class, or create a category on CALayer.

Obj-C

- (UIImage *)imageFromLayer:(CALayer *)layer {   UIGraphicsBeginImageContextWithOptions(layer.frame.size, NO, 0);    [layer renderInContext:UIGraphicsGetCurrentContext()];   UIImage *outputImage = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return outputImage; } 

Swift

func imageFromLayer(layer:CALayer) -> UIImage {     UIGraphicsBeginImageContextWithOptions(layer.frame.size, layer.isOpaque, 0)     layer.render(in: UIGraphicsGetCurrentContext()!)     let outputImage = UIGraphicsGetImageFromCurrentImageContext()     UIGraphicsEndImageContext()     return outputImage! }