Question

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        window = UIWindow(frame: UIScreen.main.bounds)
        window?.rootViewController = UINavigationController(rootViewController: MainViewController())
        window?.makeKeyAndVisible()
        return true
    }


class MainViewController: UIViewController {

    lazy var mainTV : UITableView = {
        let tv = UITableView()
        tv.delegate = self
        tv.dataSource = self
        tv.register(MainTableViewCell.self, forCellReuseIdentifier: cellId)
        tv.rowHeight = 1000  // property to access
        return tv
    }()
}



extension SubCollectionViewCell: UITableViewDelegate, UITableViewDataSource {

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = todoTV.dequeueReusableCell(withIdentifier: cellId, for: indexPath) as! TodoTableViewCell
        cell.textLabel?.text = todoList[indexPath.row]
        cell.textLabel?.numberOfLines = 0


        if indexPath.row == todoList.count - 1 {
            UIView.animate(withDuration: 0, animations: {
                self.todoTV.layoutIfNeeded()
            }) { (complete) in
                var heightOfTableView: CGFloat = 55.0
                let cells = self.todoTV.visibleCells
                for cell in cells {
                    heightOfTableView += cell.frame.height
                }
                //In here, I wanna access property of instance already created (MainViewController.mainTV.rowHeight)
            }
        }


        return cell
    }
}

Answer 1

调用延迟变量属性时，它是tableView的初始化实例。

我认为您应该像这样将tableView实例创建为全局变量：

import networkx as nx
import matplotlib.pyplot as plt
G=nx.Graph()

corr_data =([['Dog', 'Dog', 1.0],
       ['Cat', 'Dog', 0.8016854524612427],
       ['Wolf', 'Dog', 0.5206573009490967],
       ['Person', 'Dog', 0.3756750822067261],
       ['Animal', 'Dog', 0.6618534326553345],
       ['Cat', 'Cat', 1.0],
       ['Wolf', 'Cat', 0.5081626176834106],
       ['Person', 'Cat', 0.32475101947784424],
       ['Animal', 'Cat', 0.6260400414466858],
       ['Wolf', 'Wolf', 1.0],
       ['Person', 'Wolf', 0.23091702163219452],
       ['Animal', 'Wolf', 0.5261368751525879],
       ['Person', 'Person', 1.0],
       ['Animal', 'Person', 0.34220656752586365],
       ['Animal', 'Animal', 1.0]])

corr_data = [[x[0],x[1],1000**(x[2])] for x in corr_data]

existing_edges = {}

def build_graph(w, lev):
  if (lev > 5)  :
      return
  for z in corr_data:
     ind=-1 
     if z[0] == w:
         ind=0
         ind1=1
     if z[1] == w:
         ind ==1
         ind1 =0

     if ind == 0 or ind == 1:
         if  str(w) + "_" + str(corr_data[ind1]) not in existing_edges :

             G.add_node(str(corr_data[ind]))
             existing_edges[str(w) + "_" + str(corr_data[ind1])] = 1;
             G.add_edge(w,str(corr_data[ind1]))

             build_graph(corr_data[ind1], lev+1)


existing_nodes = {}
def build_graph_for_all():
    count=0
    for d in corr_data:
        if (count > 40) :
            return
        if  d[0] not in existing_edges :
             G.add_node(str(d[0]))
        if  d[1] not in existing_edges :     
             G.add_node(str(d[1]))
        G.add_weighted_edges_from([[str(d[0]), str(d[1]),d[2]]])     
        count=count + 1


build_graph_for_all()

pos = nx.spring_layout(G,weight='weight')
nx.draw(G,pos=pos, width=2, with_labels=True)

plt.savefig("path1.png")

然后（在cellForRowAt函数中）：

class MainViewController: UIViewController {

    lazy var mainTV : UITableView = {
        let mainTableView = UITableView()
        mainTableView.delegate = self
        mainTableView.dataSource = self
        mainTableView.register(MainTableViewCell.self, forCellReuseIdentifier: cellId)
        mainTableView.rowHeight = 1000
        return tv
    }()
}

我希望这个答案对您有用。

编辑：如果要创建具有动态行高的表格视图，则应设置；

mainTableView.rowHeight = 12345

Answer 2

您尝试过吗？

            let vc = MainViewController()
            let rowHeight = vc.mainTV.rowHeight

如何访问已创建的实例的属性

2 个答案: