Drawing a circle ,filled different parts with different color

Question

I am a novice ios programmer.In one of my project i need to draw a circle in which different portion of the circle would be filled up with different colors.I can draw the circle.But i am not being able to determine the different portion of the circle and fill them with different color.Here is an screenshot to clarify what i want to draw.

A help would be appreciated.

Answer 1

You can use UIBezierPath which has a method addArcWithCenter:radius:startAngle:endAngle:clockwise: where you can specify radius, center and angles. The code could look like this which draws a quarter of a circle in green:

CGPoint center = CGPointMake(CGRectGetWidth(self.bounds) / 2.f, CGRectGetHeight(self.bounds) / 2.f);
CGFloat radius = center.x - 10.f;

UIBezierPath *portionPath = [UIBezierPath bezierPath];
[portionPath moveToPoint:center];
[portionPath addArcWithCenter:center radius:radius startAngle:0.f endAngle:M_PI_2 clockwise:YES];
[portionPath closePath];

[[UIColor greenColor] setFill];
[portionPath fill];

UIBezierPath *portionPath1 = [UIBezierPath bezierPath];
[portionPath1 moveToPoint:center];
[portionPath1 addArcWithCenter:center radius:radius startAngle:M_PI_2 endAngle:M_PI clockwise:YES];
[portionPath1 closePath];

[[UIColor blueColor] setFill];
[portionPath1 fill];

Of course you can also consider to use a library like CorePlot.