gistfile1.txt

- (void)drawRect:(CGRect)rect {
    //draw the base
    UIBezierPath* baseArc = [UIBezierPath bezierPathWithArcCenter:CGPointMake(CGRectGetWidth(self.bounds) / 2, CGRectGetHeight(self.bounds) / 2)
                                                             radius:self.bounds.size.height/2-24
                                                         startAngle:DEGREES_TO_RADIANS(180)
                                                           endAngle:DEGREES_TO_RADIANS(360)
                                                          clockwise:YES];
    [[UIColor grayColor] setStroke];
    baseArc.lineWidth = 24;
    [baseArc stroke];
    
    UIBezierPath* progressArc = [UIBezierPath bezierPathWithArcCenter:CGPointMake(CGRectGetWidth(self.bounds) / 2, CGRectGetHeight(self.bounds) / 2)
                                                             radius:self.bounds.size.height/2-24
                                                         startAngle:DEGREES_TO_RADIANS(180)
                                                           endAngle:DEGREES_TO_RADIANS(340)
                                                          clockwise:YES];
    [[UIColor greenColor] setStroke];
    progressArc.lineWidth = 24;
    [progressArc stroke];
    
    //testing ball draw
    CGRect imageRect = CGRectMake(0, 0, 20, 20);
    CAShapeLayer *markerLayer = [CAShapeLayer layer];
    UIImage *marker = [UIImage imageNamed:@"shortcuts_library"];
    markerLayer.contents = (__bridge id)[marker CGImage];
    markerLayer.bounds = imageRect;
    markerLayer.position = CGPointMake(0,0);
    UIBezierPath * markerPath = [UIBezierPath bezierPathWithArcCenter:CGPointMake(CGRectGetWidth(self.bounds) / 2, CGRectGetHeight(self.bounds) / 2)
                                                                  radius:self.bounds.size.height/2-24
                                                              startAngle:DEGREES_TO_RADIANS(180)
                                                                endAngle:DEGREES_TO_RADIANS(250)
                                                               clockwise:YES];
    CGPathRef animatePath = [markerPath CGPath];
    CAKeyframeAnimation * arcToRideAnimation;
    arcToRideAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
    arcToRideAnimation.delegate = self;
    arcToRideAnimation.path = animatePath;
    arcToRideAnimation.rotationMode = kCAAnimationRotateAutoReverse;
    arcToRideAnimation.duration = 0.0;
    arcToRideAnimation.fillMode = kCAFillModeForwards;
    arcToRideAnimation.autoreverses = NO;
    arcToRideAnimation.removedOnCompletion = NO;
    arcToRideAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
    [markerLayer addAnimation:arcToRideAnimation forKey:@"test"];
    [self.layer addSublayer:markerLayer];
}