UIColor and Graphics Context - ios

Question

I have a custom UIView which draws a path like so
- (void)drawRect:(CGRect)rect{
[[UIColor blackColor] setStroke];
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextSetFillColor(ctx, CGColorGetComponents(self.color));
CGContextFillPath(ctx);
UIBezierPath *thePath = [UIBezierPath bezierPath];
thePath.lineWidth = _lineWidth;
_center = CGPointMake(rect.size.width, rect.size.height);
[thePath moveToPoint:_center];
[thePath addArcWithCenter:_center radius:rect.size.width startAngle:M_PI endAngle:M_PI+degreesToRadians(_angle)clockwise:YES];
[thePath closePath];
[thePath fill];
}
My custom UIView also has a method to change the filling color
- (void) changeColor:(UIColor *) newColor {
self.color = [newColor CGColor];
[self setNeedsDisplay];
}
If I call the changeColor: method with any of the predefined colors such as
[UIColor redColor]
everything works fine. Instead if i try to give it a custom color such as
UIColor* color = [UIColor colorWithRed:1.0f green:0.0f blue:0.0f alpha:1.0f];
the color of my custom UIView flicker between white, red and blue randomly.
Any ideas of why is that?
Thank you in advance!

Answer 1

Try:
CGContextSetFillColorWithColor(ctx, self.color.CGColor);
instead of:
CGContextSetFillColor(ctx, CGColorGetComponents(self.color));

Answer 2

When you are using this method call :
[UIColor redColor];
For optimization purposes, UIColor return an object with only 2 components because he don't need the other one. (This is made possible with the mechanism of Class clustering).
That's maybe why your code show some differences between this two colors.