Swift Firebase数据库获取数据

Question

我有Firebase云结构：

如何捕获firstBook和secondBook的名称并写入数组

从firstbook创建另一个带引号（Quote1 + Qoute2 + Quote3）的数组

我试试这个：

var array: [String] = []

override func viewDidLoad() {
    super.viewDidLoad()
    Database.database().reference().ref?.child("category").child("book").observe(.value, with: { (snapshot) in
        let valueCat = snapshot.value as! NSDictionary

        let username = valueCat["name"] as? String ?? ""
        print(username)
        self.array.append(username)
    }
}

到另一个阵列：

var quotAarray: [String] = []

override func viewDidLoad() {
    super.viewDidLoad()
    Database.database().reference().ref?.child("category").child("book").child("firstBook").observe(.value, with: { (snapshot) in
        let valueCat = snapshot.value as! NSDictionary

        let quote = valueCat["Quotes"] as? String ?? ""
        print(quote)
        self.quotAarray.append(quote)
    }
}

Answer 1

试试这个：

 let valueCat = snapshot.value as! NSDictionary
 if let firstBook = valueCat["firstBook"] as? NSDictionary {
     print(firstBook["name"])
 }

要获取所有书籍名称，您必须遍历孩子

Answer 2

检查这是否有助于您根据收到的回复制作样本词典

使用的代码：

/// Sample Data on Base of your Output SHown
var DBData = [["firstBook":["Quotes": ["Quote1":111, "Quote2":222, "Quote3":333 ], "name":"first_Book"]], ["SecondBook":["Quotes":["Quote1":111,"Quote2":222,"Quote3":333],"name":"Second_Book"]]]

/// Names Array - In which book names need to be added
var nameArray = [String]()

/// For loop on base of DBData as it Array of Array Data
for i in 0..<DBData.count {
    /// Assumed You have only one Main key in each array
    /// Can be known before .
    /// if you do not know Let's get keys here in Array at index i
    let keysArray : [String] = Array(DBData[i].keys)

    /// Now get the current dict value on base of key retrieved as in
    /// first case its - firstBook
    /// Second case its - SecondBook
    let currentDictValue = DBData[i][keysArray[0]]

    /// Now get Names of books
    /// name is the key used in your DB its generic and its fixed
    /// Now get value and add in Array
    nameArray.append(currentDictValue!["name"] as! String)
}

/// Output
print("Name Array:\(nameArray)")

最终输出：

注意使用引号或引用，键在DB中应该类似

Answer 3

@iOS Geek，但您的代码如何与Firebase一起使用？