这是点示例介绍了由
apple提供的pint结构setter getter如何才能使setter私有化
struct Point { var x = 0.0,y = 0.0 } struct Size { var width = 0.0,height = 0.0 } struct Rect { var origin = Point() var size = Size() var center: Point { get { let centerX = origin.x + (size.width / 2) let centerY = origin.y + (size.height / 2) return Point(x: centerX,y: centerY) } set(newCenter) { origin.x = newCenter.x - (size.width / 2) origin.y = newCenter.y - (size.height / 2) } } }
您可以按如下方式细化struct Rect.这将允许您只获得中心但不设置它.
struct Rect { var center:Point { let centerX = origin.x + (size.width / 2) let centerY = origin.y + (size.height / 2) return Point(x: centerX,y: centerY) } var origin = Point() var size = Size() }
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。