我找到了RxSwiftDataSources
库并从他们的文档中实现了这个例子.
以下是该示例如何实现的快速问题:
定义了自定义数据类型CustomData:
struct CustomData { var anInt: Int var aString: String var aCGPoint: CGPoint}
然后,添加该部分的表示(请注意,此处实现了SectionModelType):
struct SectionOfCustomData { var header: String var items: [Item]}extension SectionOfCustomData: SectionModelType { typealias Item = CustomData init(original: SectionOfCustomData,items: [Item]) { self = original self.items = items } }
最后,创建一些示例数据并将其绑定到表视图:
let sections: [SectionOfCustomData] = [ SectionOfCustomData(header: "First section",items: [CustomData(anInt: 0,aString: "zero",aCGPoint: CGPoint.zero),CustomData(anInt: 1,aString: "one",aCGPoint: CGPoint(x: 1,y: 1)) ]),SectionOfCustomData(header: "Second section",items: [CustomData(anInt: 2,aString: "two",aCGPoint: CGPoint(x: 2,y: 2)),CustomData(anInt: 3,aString: "three",aCGPoint: CGPoint(x: 3,y: 3)) ])]
我现在想要修改示例,只想在第二部分中显示字符串而不是CustomData的实例,所以有点像这样:
let sections = [ SectionOfCustomData(header: "First section",SectionOfString(header: "Second section",items: ["a","b","c"])]
这显然不会编译,因为段现在包含不同类型的元素SectionOfCustomData和SectionOfString.我试图通过尝试将部分声明为[SectionModelType]来解决这个问题,但这不起作用,编译器抱怨:
协议’SectionModelType’只能用作通用约束,因为它具有Self或关联类型要求
解决方法 您可以使用枚举来包装不同类型.使用枚举,SectionOfCustomData定义应该是这样的:
enum SectionOfCustomData: SectionModelType { typealias Item = Row case customDataSection(header: String,items: [Row]) case stringSection(header: String,items: [Row]) enum Row { case customData(customData: CustomData) // wrapPing CustomData to Row type case string(string: String) // wrapPing String to Row type } // followings are not directly related to this topic,but represents how to conform to SectionModelType var items: [Row] { switch self { case .customDataSection(_,let items): return items case .stringSection(_,let items): return items } } public init(original: SectionOfCustomData,items: [Row]) { switch self { case .customDataSection(let header,_): self = .customDataSection(header: header,items: items) case .stringSection(let header,_): self = .stringSection(header: header,items: items) } }}
configureCell看起来像这样:
let dataSource = RxtableVIEwSectionedReloadDataSource<SectionOfCustomData>()...dataSource.configureCell = { [weak self] (dataSource,tableVIEw,indexPath,row) -> UItableVIEwCell in switch dataSource[indexPath] { case .customData(let customData): let cell: CustomDataCell = // dequeue cell self?.configure(cell: cell,with: customData) return cell case .string(let string): let cell: StringCell = // dequeue cell self?.configure(cell: cell,with: string) return cell }}总结
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