画曲线：

- (void)drawRect:(CGRect)rect {    UIBezierPath *path = [UIBezierPath bezierPath];    [path moveToPoint:CGPointMake(140, 40)];    //添加两个控制点 和 终点    [path addCurveToPoint:CGPointMake(40, 180) controlPoint1:CGPointMake(40, 40) controlPoint2:CGPointMake(140, 180)];        [path addCurveToPoint:CGPointMake(140, 320) controlPoint1:CGPointMake(140, 180) controlPoint2:CGPointMake(40, 320)];        [[UIColor redColor]setStroke];    [path stroke];

//绘制矩形

UIBezierPath *rectPath = [UIBezierPath bezierPathWithRect:CGRectMake(50, 50, 200, 80)];    rectPath.lineWidth = 5;    [[UIColor greenColor] setStroke];    [rectPath stroke];    ```//绘制圆角矩形

UIBezierPath *roundedRect = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(50, 150, 200, 80) cornerRadius:20];[roundedRect stroke];

//绘制椭圆

UIBezierPath *oval = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(50, 250, 200, 80)];[oval stroke];

}

```