检索表格视图单元格中的标签的所有孩子价值

Question

我想检索Cake的所有孩子价值蛋糕价格标签。
我想检索，但我不能安排正确的代码，也是我入门级的ios。

火力地堡结构

的ViewController

TestTableViewCell

import UIKit 
class TestTableViewCell: UITableViewCell { 

@IBOutlet weak var cakeImage: UIImageView! 
@IBOutlet weak var cakeEngLabs: UILabel! 
@IBOutlet weak var cakeUrLabs: UILabel! 
@IBOutlet weak var cakeRateLabs: UILabel! 

} 

* TestTableViewController **

import UIKit 
import Firebase 

class TestTableViewController: UITableViewController { 

@IBOutlet var cakeTableView: UITableView! 

var ref = FIRDatabase.database().reference() 


struct Cake { 
    let cakeEngNames: String 
    let cakeUrNames: String 
    let cakeImages: UIImage 
    var cakeRates: String 
} 


var cakes = [Cake(cakeEngNames: "almond Cake", cakeUrNames: "badam cake",  cakeImages: UIImage(named:"Maru")!, cakeRates: ""), 

     Cake(cakeEngNames: "Jelly Cake", cakeUrNames: "jeli ka cake", cakeImages: UIImage(named:"spices")!, cakeRates: ""), 

     Cake(cakeEngNames: "Jelly Cake", cakeUrNames: "jeli ka cake", cakeImages: UIImage(named:"spices")!, cakeRates: ""), 

     Cake(cakeEngNames: "Jelly Cake", cakeUrNames: "jeli ka cake", cakeImages: UIImage(named:"spices")!, cakeRates: "")] 




override func viewDidLoad() { 
super.viewDidLoad() 

let AlmondSnap = ref.child("Hyderabad").child("Bakery").child("Cake") 
AlmondSnap.observe(.value, with: { (snapshot) in 
    let almondRate = snapshot.value as! String 
     self.cakes[].cakeRates = almondRate 

     print("\(almondRate)") 
     self.tableView.reloadData() 
}) 
} 

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
return self.cakes.count 
} 

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { 
let cell = self.tableView.dequeueReusableCell(withIdentifier: "TestTableViewCell", for: indexPath) as! TestTableViewCell 

cell.cakeImage.image = self.cakes[indexPath.row].cakeImages 
cell.cakeEngLabs.text = self.cakes[indexPath.row].cakeEngNames 
cell.cakeUrLabs.text = self.cakes[indexPath.row].cakeUrNames 
cell.cakeRateLabs.text = self.cakes[indexPath.row].cakeRates 
return cell 
} 
} 

Answer 1

因此，根据评论，如你所说，你只需要使用cakename和它的速率来填写表格。其他则是静态的（如果不是，请参阅@dstepan建议的结构和答案）。所以，这里是如何填充tableview中的数据。

var cakes = [Cake]() 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     let almondSnap = ref.child("Hyderabad").child("Bakery").child("Cake") 
     almondSnap.observe(.value, with: { (snapshot) in 
      if snapshot.hasChildren(){ 
       for snap in snapshot.children { 
        // snap.key produces name of cake 
        // snap.value produces rate of cake 

        if let node = snap as? FIRDataSnapshot, let rate = node.value as? Int { 
         self.cakes.append(Cake(cakeEngNames: node.key, 
              cakeUrNames: "badam cake", 
              cakeImages: UIImage(named:"Maru")!, 
              cakeRates: String(rate))) 
        } 
       } 
       self.cakeTableView.reloadData() 
      } 
     }) 
    } 

Answer 2

如果你存储在NSMutableArray中的所有值使用此

cell.cakeRateLbl.text = “Almon Cake Rate :\(self.cakesArray[0].objectForKey(“Hyderabad”).objectAtIndex(0).objectForKey(“Bakery”).ObjectAtIndex(0).objectForKey(“Cake”).objectAtIndex(0).valueForKey(“Almon_Cake”) as! Int)\nAzna Mental Cake Rate :\(self.cakesArray[0].objectForKey(“Hyderabad”).objectAtIndex(0).objectForKey(“Bakery”).ObjectAtIndex(0).objectForKey(“Cake”).objectAtIndex(0).valueForKey(“Azna_Mental_Cake”) as! Int)\nBlack Forest Cake Rate :\(self.cakesArray[0].objectForKey(“Hyderabad”).objectAtIndex(0).objectForKey(“Bakery”).ObjectAtIndex(0).objectForKey(“Cake”).objectAtIndex(0).valueForKey(“Black_Forest_Cake”) as! Int)” 

或者你可以试试这个

cell.cakeRateLbl.text = “Almon Cake Rate :\(self.cakes[indexpath.row].Almond_Cake)\nAzna Mental Cake Rate :\(self.cakes[indexpath.row].Azna_Mental_Cake)\nBlack Forest Cake Rate :\(self.cakes[indexpath.row].Black_Forest_Cake)” 

Answer 3

由于目前构建，你可以a CCESS您Cake节点如下图所示：

var cakes: [Cake] = [] 

override func viewDidLoad() { 
    super.viewDidLoad() 

    let AlmondSnap = ref.child("Hyderabad").child("Bakery").child("Cake") 

    AlmondSnap.observe(.value, with: { (snapshot) in 

     for item in snapshot.children { 

      if let cakeFromDatabase = item as? FIRDataSnapshot { 

       let cake = Cake() 

       cake.cakeRates = cakeFromDatabase.value // for "Almond_Cake" this will be 800 

       cakes.append(cake) 

      } 

     } 

     self.tableView.reloadData() 
    }) 
} 

但是，你很可能从制作一对夫妇的设计改变你目前的做法的基础上，我所看到的受益。

你的数据库结构，大概应该是

dgrproject-ac0e7 
-- Hyderabad 
    -- Bakery 
     -- Cakes 
      -- id1 
       -- name: Almond Cake 
       -- rate: 800 

等。

然后，在你的代码，你可以做以下

var cakes: [Cake] = [] { 
    didSet { 
     self.tableView.reloadData() 
    } 
} 

override func viewDidLoad() { 
    super.viewDidLoad() 

    let AlmondSnap = ref.child("Hyderabad").child("Bakery").child("Cake") 

    AlmondSnap.observe(.value, with: { (snapshot) in 

     let allCakes = [] 

     for item in snapshot.children { 

      if let cakeFromDatabase = item as? FIRDataSnapshot { 

       let cake = Cake() 

       cake.cakeEngNames = cakeFromDatabase["name"] as? String 
       cake.cakeRates = cakeFromDatabase["rate"] as? Int 

       allCakes.append(cake) 

      } 

     } 

     cakes = allCakes 
    }) 
} 

添加didSet你的蛋糕阵列，只要你设置cakes现在会自动刷新的tableView。这会清理代码在Firebase调用的完成处理程序中。我们还创建了一个allCakes数组，以便我们不会将一个新的Cake对象附加到cakes，并导致在数据集增长时可能重新加载表视图数百次。

希望这会有所帮助！