UIBezierPath draw circle with different strokes - ios

Question

Basically I need to have a circle with stroke in different color, all equal in size. For example, 1/2 is blue and 1/2 is red. Image (sorry for so bad image):
How can I draw something like this?

Answer 1

There are lots of ways to do it, but one is to just draw two bezier paths, one for each side:
- (void)drawRect:(CGRect)rect
{
UIBezierPath *blueHalf = [UIBezierPath bezierPath];
[blueHalf addArcWithCenter:CGPointMake(100, 100) radius:90.0 startAngle:-M_PI_2 endAngle:M_PI_2 clockwise:YES];
[blueHalf setLineWidth:4.0];
[[UIColor blueColor] setStroke];
[blueHalf stroke];
UIBezierPath *redHalf = [UIBezierPath bezierPath];
[redHalf addArcWithCenter:CGPointMake(100, 100) radius:90.0 startAngle:M_PI_2 endAngle:-M_PI_2 clockwise:YES];
[redHalf setLineWidth:4.0];
[[UIColor redColor] setStroke];
[redHalf stroke];
}
Or, if you want to do this in Core Graphics:
- (void)drawRect:(CGRect)rect
{
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetLineWidth(context, 4);
CGContextSetStrokeColorWithColor(context, [[UIColor blueColor] CGColor]);
CGContextAddArc(context, 100, 100, 90, -M_PI_2, M_PI_2, FALSE);
CGContextStrokePath(context);
CGContextSetStrokeColorWithColor(context, [[UIColor redColor] CGColor]);
CGContextAddArc(context, 100, 100, 90, M_PI_2, -M_PI_2, FALSE);
CGContextStrokePath(context);
}