Swift中的私人二手“set()”
发布时间:2020-12-14 02:29:53 所属栏目:百科 来源:网络整理
导读: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 cent
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() } (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |