ios绘图基本图形之弧形2
// controllerX,controllerY是弧形起始点的坐标,endX,endY是结束点的坐标
CGContextAddQuadCurveToPoint(ctx, controllerX, controllerY, endX, endY);
// controllerX,controllerY是弧形起始点的坐标,endX,endY是结束点的坐标
CGContextAddQuadCurveToPoint(ctx, controllerX, controllerY, endX, endY);