gistfile1.m

// Caller, a subclass of UITableViewCell. Only have a method

- (void) drawRect:(CGRect)rect
{
	CGContextRef context = UIGraphicsGetCurrentContext();
	CGColorRef whiteColor = [UIColor whiteColor].CGColor;
	CGColorRef lightGrayColor = [UIColor colorWithRed:230.0/255.0
												green:230.0/255.0 
												 blue:230.0/255.0 
												alpha:1.0].CGColor;
	CGColorRef separatorColor = [UIColor colorWithRed:208.0/255.0
												green:208.0/255.0 
												 blue:208.0/255.0
												alpha:1.0].CGColor;
	CGRect paperRect = self.bounds;
	CGRect nameRect = self.nameLabel.frame;
	CGPoint sepStartPoint = CGPointMake(nameRect.origin.x, 
										nameRect.origin.x + nameRect.size.height + 2);
	CGPoint sepEndPoint = CGPointMake(nameRect.origin.x + nameRect.size.width, 
									  nameRect.origin.x + nameRect.size.height + 2);
	
	drawLinearGradient(context, paperRect, lightGrayColor, whiteColor);
	draw1PxStroke(context, sepStartPoint, sepEndPoint, separatorColor);

}


// Callee, where the problem is
void drawLinearGradient(CGContextRef context,
						CGRect rect,
						CGColorRef startColor, 
						CGColorRef endColor)
{
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    CGFloat locations[] = { 0.0, 1.0 };
	
    NSArray *colors = [NSArray arrayWithObjects:
					   (__bridge id)startColor,
					   (__bridge id)endColor,
					   nil]; // Here is the line
	
    CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, 
														(__bridge CFArrayRef) colors, locations);
	
    CGPoint startPoint = CGPointMake(CGRectGetMidX(rect), CGRectGetMinY(rect));
	CGPoint endPoint = CGPointMake(CGRectGetMidX(rect), CGRectGetMaxY(rect));
	
	CGContextSaveGState(context);
	CGContextAddRect(context, rect);
	CGContextClip(context);
	CGContextDrawLinearGradient(context, gradient, startPoint, endPoint, 0);
	CGContextRestoreGState(context);
	
	CGGradientRelease(gradient);
	CGColorSpaceRelease(colorSpace);
}

// For Peter Hosey :

(gdb) po startColor
<CGColor 0x1deca0> [<CGColorSpace 0x1d3280> (kCGColorSpaceDeviceGray)] ( 1 1 )
Current language:  auto; currently objective-c
(gdb) po endColor
<CGColorSpace 0x1bf120> (kCGColorSpaceDeviceRGB)
(gbd)