如何像UITableDataSource那样为我的类创建数据源?

创建自定义数据源的工作方式与委托模式类似。

protocol GraphViewDataSource: class {
  func numberOfRow(for graph: GraphView) -> Int
}

class GraphView {
  weak var dataSource: GraphViewDataSource?

  init() {
    let numberOfRow = dataSource?.numberOfRow(for: self)
  }
}

dataSource 属性到 weak 避免引用循环(这就是为什么 GraphViewDataSource 需要约束到 class ).

可能是这样的

protocol GraphDataSource {

    func Graph(_ graph:GraphView , row:Int)->UIView
}

protocol GraphDelegate {

    func Graph(_ graph:GraphView ,didSelect row:Int)
}

class GraphView:UIView {

    weak open var dataSource:GraphDataSource?

    weak open var delegate:GraphDelegate?

    func configureHere() {

        let v = dataSource?.Graph(self, row: 0)
        delegate?.Graph(self, didSelect: 0)
    }

}
class ViewController: UIViewController , GraphDataSource , GraphDelegate {


   let g = GraphView()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        g.delegate = self
        g.dataSource = self

    }


    func Graph(_ graph: GraphView, didSelect row: Int) {

    }

    func Graph(_ graph: GraphView, row: Int) -> UIView {

    }

}