如何在Core Graphics中更改CALayer的填充颜色？

Question

I have a shape, a CALayer, which I want to add core graphics effects to. Right now, I want to keep it simple and change the fill colour of it. How can I do this?

Answer 1

If you just want to change the color of the whole layer you can use:

layer.backgroundColor = [[UIColor greenColor] CGColor];

if you have a more complex shape like a path to fill, you need to overwrite the layer's drawInContext: with sth like this:

- (void)drawInContext:(CGContextRef)context
{
    //...
    CGContextSetFillColorWithColor(context, [[UIColor greenColor] CGColor]);
    CGContextFillPath(context);
    //...
}

See Quartz 2D Programming Guide for more info.

Answer 2

shape.fillColor = [UIColor blackColor].CGColor;

Answer 3

[[UIColor redColor] setFill] is what you're looking for, I believe.

I don't have Xcode open atm, but that should be the right method if you're trying to fill a path.