Swift 尝试将对象添加到类并将信息保存到Firebase数据库

我想通过应用程序中的视图控制器保存新对象。但是，我希望在应用程序登录时加载这些新对象。我正在使用firebase将数据保存到数据库中，但如何保存对象并在应用程序再次登录时使其返回？我是编程新手，对于可能出现的任何混乱，我深表歉意

这里是应用程序登录后读取目标信息的位置

for i in 0 ... clientList.count - 1 {

screenHandle = ref?.child(organizationCode).child(clientList[i].name).observe(.value, with: { (snapshot) in
    let clientStuffLoad = snapshot.value as! [String:Any]

    if clientStuffLoad["Goal 1 Description"] != nil {
        clientList[i].goal1 = clientStuffLoad["Goal 1"] as! String
    } else {
        clientList[i].goal1 = ""
    }

这基本上就是关于向类

客户端添加新成员的内容：

@IBAction func addingClientSaveButton(_ sender: Any) {


        var client7 = Client(name: addingClientName.text!, 
                      goal1: addingClientGoal1.text!, goal2: 
                      addingClientGoal2.text!, 
                      goal3: addingClientGoal3.text!, 
                      isSelected: false, s: 1, 
                      ind: 1, targetBehavior1 : addingClientTB1.text!, 
                      targetBehavior2 : addingClientTB2.text!, 
                      targetBehavior3 : addingClientTB3.text!, 
                      targetBehavior1Info : addingClientTB1Info.text!, 
                      targetBehavior2Info : addingClientTB2Info.text!, 
                      targetBehavior3Info : addingClientTB3Info.text!)

但是我希望对象名读取客户端名称输入，而不是
client7

第二部分是，我想要一种将其写入数据库的方法，并且能够在登录时读取它，这样我就可以使用类的属性，并在添加新客户端时添加到该类中。
这是一个非常广泛的问题，因为它涵盖了使用Firebase的许多不同方面；书写、阅读、处理DataSnapshots等。此外，我不知道您的数据代表什么，因此我为自己挑选了一些内容，介绍与Firebase合作的一些方面

没有错误检查，但它按原样工作。我一路上都发表了评论

Firebase没有任何对象；只有父节点和子节点。一切都可以像字典一样被视为键：值对。不能写入对象或读取对象。只有NSString、NSNumber、NSDictionary和可怕的NSArray（或其快速对应项）

让我们从一个类开始——有100种方法可以做到这一点，但我喜欢类负责它们的属性，并接受它们并展示它们

class WineClass {
    var wine_key = ""
    var name = ""
    var varietal = ""

    //this is used when creating a new wine object before storing in firebase
    init(withName: String, andVarietal: String) {
        self.name = withName
        self.varietal = andVarietal
    }

    //this is used when we are loading data from firebase to create the wineclass object
    init(withSnapshot: DataSnapshot) {
        let wineName = withSnapshot.childSnapshot(forPath: "wine_name").value as? String ?? "No Wine Name"

        let wineDict = withSnapshot.value as! [String: Any]
        let wineVarietal = wineDict["wine_varietal"] as? String ?? "No Wine Varietal"

        self.wine_key = withSnapshot.key //when we read a wine, this will be it's reference in case we want to update or delete it
        self.name = wineName
        self.varietal = wineVarietal
    }

    //this is use to create a dictionary of key:value pairs to be written to firebase
    func getWineDictForFirebase() -> [String: Any] {
        let d = [
            "wine_name": self.name,
            "wine_varietal": self.varietal
        ]

        return d
    }
}

然后，我们需要一个类var来存储wine类的。例如，这将是tableView的数据源

var wineArray = [WineClass]() //a class var array to store my wines

然后我会给你们两个按钮，一个用来填充并向Firebase写入一些葡萄酒，另一个用来读入并打印到控制台

func button0() {
    self.writeWine(withName: "Scarecrow", andVarietal: "Red Blend")
    self.writeWine(withName: "Ghost Horse", andVarietal: "Cabernet Sauvignon")
    self.writeWine(withName: "Screaming Eagle", andVarietal: "Cabernet Sauvignon, Merlot, Cabernet Franc")
}

func button1() {
    self.readWines()
}

然后函数接受一些字符串作为每种葡萄酒的属性，并将它们写入Firebase

func writeWine(withName: String, andVarietal: String) {
   let newWine = WineClass(withName: withName, andVarietal: andVarietal) //create a new wine object

   let wineListRef = self.ref.child("wine_list") //get a reference to my firebase wine_list
   let thisWineRef = wineListRef.childByAutoId() //a new node for this wine
   let d = newWine.getWineDictForFirebase() //get the wine properties as a dictionary
   thisWineRef.setValue(d) //save it in firebase
}

最后是一个函数，它读取这些葡萄酒，并在控制台中打印它们的属性

func readWines() {
   let wineRef = self.ref.child("wine_list")
   wineRef.observeSingleEvent(of: .value, with: { snapshot in //we are reading in the entire wine node which will contain many child nodes
       let allWines = snapshot.children.allObjects as! [DataSnapshot] //cast each child node as a DataSnapshot & store in array
       for wineSnap in allWines { //iterate over each child node in the array
           let wine = WineClass(withSnapshot: wineSnap) //create a new wine, ensuring we also keep track of it's key
           self.wineArray.append(wine) //add to the array
       }

       for wine in self.wineArray  {
           print(wine.wine_key, wine.name, wine.varietal)
       }
   })
}

最后，当点击按钮0时，我们的Firebase如下所示

wine_list
   -LhbjhkEC8o9TUISCjdw
      wine_name: "Scarecrow"
      wine_varietal: "Red Blend"
   -LhbjhkEC8o9TUISCjdx
      wine_name: "Ghost Horse"
      wine_varietal: "Cabernet Sauvignon"
   -LhbjhkEC8o9TUISCjdy
      wine_name: "Screaming Eagle"
      wine_varietal: "Cabernet Sauvignon, Merlot, Cabernet Franc"

然后单击按钮1时输出

-LhbjhkEC8o9TUISCjdw Scarecrow Red Blend
-LhbjhkEC8o9TUISCjdx Ghost Horse Cabernet Sauvignon
-LhbjhkEC8o9TUISCjdy Screaming Eagle Cabernet Sauvignon, Merlot, Cabernet Franc

请注意，self.ref是对my firebase根节点的引用。您需要引用您的firebase。
这是一个非常广泛的问题，因为它涵盖了使用firebase的许多不同方面；书写、阅读、处理DataSnapshots等。此外，我不知道您的数据代表什么，因此我为自己挑选了一些内容，介绍与Firebase合作的一些方面

没有错误检查，但它按原样工作。我一路上都发表了评论

Firebase没有任何对象；只有父节点和子节点。一切都可以像字典一样被视为键：值对。不能写入对象或读取对象。只有NSString、NSNumber、NSDictionary和可怕的NSArray（或其快速对应项）

让我们从一个类开始——有100种方法可以做到这一点，但我喜欢类负责它们的属性，并接受它们并展示它们

class WineClass {
    var wine_key = ""
    var name = ""
    var varietal = ""

    //this is used when creating a new wine object before storing in firebase
    init(withName: String, andVarietal: String) {
        self.name = withName
        self.varietal = andVarietal
    }

    //this is used when we are loading data from firebase to create the wineclass object
    init(withSnapshot: DataSnapshot) {
        let wineName = withSnapshot.childSnapshot(forPath: "wine_name").value as? String ?? "No Wine Name"

        let wineDict = withSnapshot.value as! [String: Any]
        let wineVarietal = wineDict["wine_varietal"] as? String ?? "No Wine Varietal"

        self.wine_key = withSnapshot.key //when we read a wine, this will be it's reference in case we want to update or delete it
        self.name = wineName
        self.varietal = wineVarietal
    }

    //this is use to create a dictionary of key:value pairs to be written to firebase
    func getWineDictForFirebase() -> [String: Any] {
        let d = [
            "wine_name": self.name,
            "wine_varietal": self.varietal
        ]

        return d
    }
}

然后，我们需要一个类var来存储wine类的。例如，这将是tableView的数据源

var wineArray = [WineClass]() //a class var array to store my wines

然后我会给你们两个按钮，一个用来填充并向Firebase写入一些葡萄酒，另一个用来读入并打印到控制台

func button0() {
    self.writeWine(withName: "Scarecrow", andVarietal: "Red Blend")
    self.writeWine(withName: "Ghost Horse", andVarietal: "Cabernet Sauvignon")
    self.writeWine(withName: "Screaming Eagle", andVarietal: "Cabernet Sauvignon, Merlot, Cabernet Franc")
}

func button1() {
    self.readWines()
}

然后函数接受一些字符串作为每种葡萄酒的属性，并将它们写入Firebase

func writeWine(withName: String, andVarietal: String) {
   let newWine = WineClass(withName: withName, andVarietal: andVarietal) //create a new wine object

   let wineListRef = self.ref.child("wine_list") //get a reference to my firebase wine_list
   let thisWineRef = wineListRef.childByAutoId() //a new node for this wine
   let d = newWine.getWineDictForFirebase() //get the wine properties as a dictionary
   thisWineRef.setValue(d) //save it in firebase
}

最后是一个函数，它读取这些葡萄酒，并在控制台中打印它们的属性

func readWines() {
   let wineRef = self.ref.child("wine_list")
   wineRef.observeSingleEvent(of: .value, with: { snapshot in //we are reading in the entire wine node which will contain many child nodes
       let allWines = snapshot.children.allObjects as! [DataSnapshot] //cast each child node as a DataSnapshot & store in array
       for wineSnap in allWines { //iterate over each child node in the array
           let wine = WineClass(withSnapshot: wineSnap) //create a new wine, ensuring we also keep track of it's key
           self.wineArray.append(wine) //add to the array
       }

       for wine in self.wineArray  {
           print(wine.wine_key, wine.name, wine.varietal)
       }
   })
}

最后，当点击按钮0时，我们的Firebase如下所示

wine_list
   -LhbjhkEC8o9TUISCjdw
      wine_name: "Scarecrow"
      wine_varietal: "Red Blend"
   -LhbjhkEC8o9TUISCjdx
      wine_name: "Ghost Horse"
      wine_varietal: "Cabernet Sauvignon"
   -LhbjhkEC8o9TUISCjdy
      wine_name: "Screaming Eagle"
      wine_varietal: "Cabernet Sauvignon, Merlot, Cabernet Franc"

然后单击按钮1时输出

-LhbjhkEC8o9TUISCjdw Scarecrow Red Blend
-LhbjhkEC8o9TUISCjdx Ghost Horse Cabernet Sauvignon
-LhbjhkEC8o9TUISCjdy Screaming Eagle Cabernet Sauvignon, Merlot, Cabernet Franc

请注意，self.ref是对my firebase根节点的引用。您需要引用您的firebase。
一般来说，如果您连接并观察firebase中的某个节点，它将在应用程序启动时自动加载数据（假设调用了该函数），并且该节点内的任何数据更改都将被调用。您是否有机会阅读Firebase入门指南。你对指南的哪一部分或你的代码有困难？嗨，杰，谢谢你的回答。我希望向类中添加成员，并将这些对象保存为firebase实体。我想我正在寻找一个示例，说明如何通过按下按钮添加一个类的对象，将该对象保存到firebase中，然后在再次登录应用程序时读取该对象及其所有属性。这有意义吗？我不知道如何最好地以编程方式添加新对象，而不必手动定义对象本身或通过firebase保存属性；我希望大的答案有帮助！通常，如果您在Firebase中连接并观察到一个节点，它将在应用程序启动时自动加载数据（假设调用了该函数），并且在该节点中的任何时间数据发生更改时，它也将被调用。您是否有机会阅读Firebase入门指南。你对指南的哪一部分或你的代码有困难？嗨，杰，谢谢你的回答。我希望向类中添加成员，并将这些对象保存为firebase实体。我想我正在寻找一个示例，说明如何通过按下按钮添加一个类的对象，将该对象保存到firebase中，然后在再次登录应用程序时读取该对象及其所有属性。这有意义吗？我不知道如何最好地以编程方式添加新对象，而不必手动定义对象本身或通过firebase保存属性；我希望大的答案有帮助！我想我最需要帮助的部分是，我希望我的save函数（即button0）能够使用用户在
UITextField
中选择的名称保存
newWine
，从而使用用户的