[英]How to bind table view with multiple sections that represent different data types using RxSwift and RxSwiftDataSources?
我正在嘗試使用RxSwift創建一個包含多個部分的表視圖。 每個部分顯示代表不同類型的數據。
我找到了RxSwiftDataSources
庫並從他們的文檔中實現了這個例子。
以下是該示例如何實現的快速問題:
定義了自定義數據類型CustomData
:
struct CustomData {
var anInt: Int
var aString: String
var aCGPoint: CGPoint
}
然后,添加該部分的表示(請注意,此處實現了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,創建一些示例數據並將其綁定到表視圖:
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)) ])
]
我現在想修改示例,只想在第二部分顯示String
而不是CustomData
實例,所以有點像這樣:
let sections = [
SectionOfCustomData(header: "First section", items: [CustomData(anInt: 0, aString: "zero", aCGPoint: CGPoint.zero), CustomData(anInt: 1, aString: "one", aCGPoint: CGPoint(x: 1, y: 1)) ]),
SectionOfString(header: "Second section", items: ["a", "b", "c"])
]
這顯然不會編譯,因為sections
現在包含不同類型的元素SectionOfCustomData
和SectionOfString
。 我試圖通過嘗試將部分聲明為[SectionModelType]
來解決這個問題,但這不起作用,編譯器抱怨:
協議' SectionModelType
'只能用作通用約束,因為它具有Self或關聯類型要求
您可以使用枚舉來包裝不同類型。
使用枚舉,SectionOfCustomData定義應該是這樣的:
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看起來像這樣:
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
}
}
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