How do I MOVE a circle drawn in a subclass of UIView by overwriting the method "drawRect"??

Question

hi, I'm trying to figure out what i'm doing wrong but i just don't get it. Here is what i want to do:

I want to draw a circle somewhere on the screen of the iphone and then i want the circle always to be displayed at the position where the user currently taps on the screen. I started by creating a subclass of UIView and adding the following lines into the "drawRect" method:

- (void)drawRect:(CGRect)rect {

//Create the main view!

 CGContextRef mainscreen = UIGraphicsGetCurrentContext();

 //Draw the dot
 //will be a circle cause rectangle is a square
 CGRect dotRect = CGRectMake(50, 80, 100, 100);
 [[UIColor blueColor] set];
 CGContextStrokeEllipseInRect(mainscreen, dotRect);
 CGContextFillEllipseInRect(mainscreen, dotRect);

}

The appears just fine but now i have no idea how to make it move around on the screen i've tried serveral things and nothing worked pls help!

Answer 1

To draw the dot in a different location, change the origin of dotRect. To figure out where to draw it, implement -touchesBegan:withEvent: and -touchesMoved:withEvent: and record the location where the touches are occuring.