Question

我有一个GraphView（xib + class）类。带有标签和其他UI元素的图表视图。我需要为此类创建DataSource协议，该协议已在UITableView中实现为UITableDataSource。这就需要更舒适地处理数据，我希望将其加载到GraphView中。

如果您知道该怎么做或有此问题解决方案的链接，请帮助我。谢谢所有问题！

Answer 1

创建自定义数据源就像代理模式一样。

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

class GraphView {
  weak var dataSource: GraphViewDataSource?

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

注意：不要忘记将dataSource属性设置为weak以避免引用周期（这就是GraphViewDataSource需要限制为class的原因）。< / p>

Answer 2

类似于

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 {

    }

}

如何为我的类（如UITableDataSource）创建数据源？

2 个答案: