通过UIBezierPath贝塞尔曲线画圆形、椭圆、矩形

/**创建椭圆形的贝塞尔曲线*/UIBezierPath *_ovalPath=[UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, 200, 100)];/**创建矩形的贝塞尔曲线*/UIBezierPath *_rectPath=[UIBezierPath bezierPathWithRect:CGRectMake(0, 0, 200, 100)];/**创建圆形的贝塞尔曲线*/UIBezierPath *_circlePath=[UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, 100, 100)];UIBezierPath *_shapePath=[UIBezierPath bezierPathWithArcCenter:CGPointMake(20, 0) radius:100 startAngle:0 endAngle:3.14*2 clockwise:YES];/**创建带形状的图层*/CAShapeLayer *_shapeLayer=[CAShapeLayer layer];_shapeLayer.frame=CGRectMake(0, 0, 200, 100);_shapeLayer.position=self.view.center;/**注意:图层之间与贝塞尔曲线之间通过path进行关联*/_shapeLayer.path=_shapePath.CGPath;_shapeLayer.fillColor=[UIColor redColor].CGColor;[self.view.layer addSublayer:_shapeLayer];