iphone - CGGradient in an CGPath

Question

Is it possible to draw a gradient in a path on the iPhone?

I'm looking for a replacement of the mac os x method

-(void)drawInBezierPath:(NSBezierPath *)path relativeCenterPosition:(NSPoint)relativeCenterPosition of NSGradient.

Answer 1

I think something like this will work:

CGContextSaveGState(c);
CGContextAddPath(c, path);
CGContextClip(c)

// make a gradient
CGColorRef colors[] = { topColor, bottomColor };
CFArrayRef colorsArr = CFArrayCreate(NULL, (const void**)colors, sizeof(colors) / sizeof(CGColorRef), &kCFTypeArrayCallBacks);

CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, colorsArr, NULL);
CFRelease(colorSpace);
CFRelease(colorsArr);

//  Draw a linear gradient from top to bottom
CGPoint start = ...
CGPoint end = ...
CGContextDrawLinearGradient(c, gradient, start, end, 0);

CFRelease(gradient);
CGContextRestoreGState(c);