CoreGraphics drawRect in a cocos2d project EXEC BAD ACCESS - uikit

Question

I got a interesting riddle here. My cocos2d project uses a UIView to display nicer popups than the regular alert view. To be more flexible in the size of the popup, I draw the background in the drawRect method.
But first the hierarchy how I implement cocos2d and UIKit:
Every UIKit element is added to the RootViewController. Every CCNode to the EAGLView. (If someone has a better solution to mix those world, don't wait to tell me!) Unfortunately is every UIKit view in front of cocos nodes.
Everything works fine when I add the first popup to the RootViewController. But if I remove the first popup and add a new one to the RootViewController occurs a bad access.
It crashes only in combination with cocos2d.
I use the code from Ray Wenderlichs CoreGraphics 101 tutorial.
context and strokeColor are not nil.
Another important infos: I use ARC and am supporting iOS 4.2 and above.
The complete code can be found at raywenderlich.com or below
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];
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);
}
CGRect rectFor1PxStroke(CGRect rect)
{
return CGRectMake(rect.origin.x + 0.5, rect.origin.y + 0.5, rect.size.width - 1, rect.size.height -1);
}
- (void)drawRect:(CGRect)rect
{
CGContextRef context = UIGraphicsGetCurrentContext();
CGRect frame = CGRectInset(self.bounds, 2, 2);
CGContextSetShadowWithColor(context, CGSizeMake(0, 0), 3.0, shadowColor);
CGRect strokeRect = CGRectInset(frame, -2.0, -2.0);
CGContextSetStrokeColorWithColor(context, strokeColor);
CGContextSetLineWidth(context, 2.0);
CGContextStrokeRect(context, rectFor1PxStroke(strokeRect));
drawLinearGradient(context, frame, gradient1, gradient2);
}

Answer 1

ARC releases the CGColorRef named strokeColor. One fix is to replace it with an CGFloat array and use CGContextSetStrokeColor instead CGContextSetStrokeColorWithColor
This answer solves this issue:
App crashes when using __bridge for CoreGraphics gradient on ARC

Answer 2

I agree with zeiteisen ,ARC releases CGColorRef and the easiest way to solve this by
replacing CGContextSetStrokeColorWithColor with
CGContextSetStrokeColor(context, components)
Change UIColor of strokeColor to 'RGB CGFloat components array' as following:
static CGFloat red, green, blue, alpha;
- (void)getRGBComponents:(CGFloat [4])components forColor:(UIColor *)color {
[color getRed:&red green:&green blue:&blue alpha:&alpha];//To fetch CGFloat RGB components
for (int component = 0; component < 4; component++) {
switch (component) {
case 0:
components[component] = red;
break;
case 1:
components[component] = green;
break;
case 2:
components[component] = blue;
break;
case 3:
components[component] = alpha;
break;
default:
break;
}
}
}
Use this method like this:
CGFloat components[4];
UIColor *strokeColor=[UIColor greyColor];//My color
[self getRGBComponents:components forColor:strokeColor];//'components' will be substituted in CGContextSetStrokeColor
NSLog(#"%f %f %f %f", components[0], components[1], components[2],components[3]);