Redraw a rect using UIBezierPath - ios

Question

I draw an initial simple rect using UIBezierPath and fill it with color. How can I change only its color by touching on it?
- (void) drawRect:(CGRect)rect
{
// Drawing code
[self drawRectWithFrame:_myRect fillColor:_firstColor];
}
- (void) drawRectWithFrame:(CGRect)frame fillColor:(UIColor *)color
{
[color setFill];
UIBezierPath *path = [UIBezierPath bezierPathWithRect:frame];
[path fill];
}
- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
//get the rect color from touches (pixel color)
UIColor *color = [self getRectColorFromTouches:touches];
//chnage the rect color
if (color == _firstColor) {
//doesn't work
//[self drawRectWithFrame:_myRect fillColor:_secondColor]; //??
//How can I do that?
}
else {
//??
}
}

Answer 1

Some remarks :
Instead of overriding UIView touch event methods, you should use a UIGestureRecognizer. In your case, a UItapGestureRecognizer might be enough. (this way, it will be easier to handle conflict between different touch actions, that's the reason why gestureRecognizers were created!)
When you receive tap, change a local property of your view (for example, a BOOL isRectangleDrawn might be changed each time the view receives the tap)
Finally - and that's what missing in your code, that otherwise should be correct - don't forget to call [self setNeedsDisplay] to be sure your view's - (void) drawRect:(CGRect)rect method gets called