UIBezierPath支持相对路径?

我把苹果的文档读到了 UIBezierPath 对象我是否正确理解了它不支持相对路径?

我试图将此svg路径转换为UIBezierPath:

// svg path
m90 36c-7 0-13 6-13 13s6 13 13 13 13-6 13-13-6-13-13-13zm-27 32c-7 0-13 6-13 13s6 13 13 13 13-6 13-13-6-13-13-13z

我从以下方面开始:

UIBezierPath* myPath = [UIBezierPath bezierPath];
CGPoint currentPoint;

[myPath moveToPoint:CGPointMake([self sizeDependendX:90], [self sizeDependendY:36])];
currentPoint = CGPathGetCurrentPoint(myPath.CGPath);
[myPath addCurveToPoint:CGPointMake(currentPoint.x - 13, currentPoint.y + 13)
          controlPoint1:CGPointMake(currentPoint.x +  7, currentPoint.y +  0)
          controlPoint2:CGPointMake(currentPoint.x - 13, currentPoint.y +  6)];
currentPoint = CGPathGetCurrentPoint(myPath.CGPath);
[myPath addCurveToPoint:CGPointMake(currentPoint.x + 13 ,currentPoint.y + 13)
          controlPoint1:CGPointMake(currentPoint.x +  0, currentPoint.y +  7)
          controlPoint2:CGPointMake(currentPoint.x +  6, currentPoint.y + 13)];
...

是真的要这样还是我错过了什么?