问如何为核心图形绘制的UIButton创建选择状态颜色？

EN

CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef maskCtx = CGBitmapContextCreate(NULL, width, height, 8, 4 * width, colorSpace, kCGImageAlphaPremultipliedFirst);
CGColorSpaceRelease(colorSpace);

UIBezierPath* path = CreateADiamondBezierPath();

CGContextSetRGBFillColor(maskCtx, 0, 0, 0, 1);
CGContextBeginPath(maskCtx);
CGContextAddPath(maskCtx, path.CGPath);
CGContextFillPath(maskCtx);

CGImageRef maskImg = CGBitmapContextCreateImage(maskCtx);

//Clip to the mask
CGContextClipToMask(ctx, scaledFrame, maskImg);

//Now fil in your ctx with the selected color
CGContextSetRGBFillColor(ctx, 1, 0, 0, 1); //this does red

CFRelease(maskImg);
CFRelease(maskCtx);