我需要编一本字典，格式是[国家：代表]。我保存了一份代表名单，里面有关于这位代表的一些相关信息。看起来是这样的：
我需要根据这些代表身上的国家价值对他们进行分类。
我试图隔离每个状态值，但它最终只打印出整个子快照。
ref = Database.database().reference(fromURL: "Redacted for Privacy")
ref.observeSingleEvent(of: .value, with: { snapshot in
print(snapshot.childrenCount) // I got the expected number of items
let enumerator = snapshot.children
while let rest = enumerator.nextObject() as? DataSnapshot {
print(rest.value!)
}
})
我怎么可能存储每个代表，使他们实际上是由他们的状态定义的？例如，这本词典中的一个条目可能是阿拉巴马州（Jo Bonner、Martha Roby、Mike Rogers、Robert B Aderholt、Mo Brooks、Spencer Bachus、Terri A Sewell）。我所发现的例子似乎都无法改变。
我试过使用这个代码：
DispatchQueue.main.asyncAfter(deadline: .now() + .seconds(6), execute: {
print("six second delay")
print("entered function")
var i: Int = 0
var x: Int = 0
while(i < self.repList.count){
print("i = " + String(i))
self.ref = Database.database().reference(fromURL: "Redacted for privacy" + "/" + self.repList[i] + "/" + "State")
self.ref.observeSingleEvent(of: .value, with: { snapshot in
print(snapshot.value!)
let valString = snapshot.value! as? String
if (valString != nil){
self.captured = String(valString!)
print("Noice")
}
else {
print("ya done f***** up")
}
})
while(x < self.stateCongmanDict.count){
print("x = " + String(x))
if (self.stateCongmanDict[self.captured] != nil){
self.alreadyThere = true
break
}
x = x + 1
}
self.stateCongmanDict[self.captured] = [self.captured]
i = i + 1
}
i = 0
x = 0
while (i < self.repList.count){
print("i restarted = " + String(i))
self.ref = Database.database().reference(fromURL: "Redacted for privacy" + "/" + self.repList[i] + "/" + "State")
self.ref.observeSingleEvent(of: .value, with: { snapshot in
print(snapshot.value!)
let valString = snapshot.value! as? String
if (valString != nil){
self.captured = String(valString!)
print("Noice")
}
else {
print("ya done f***** up")
}
})
while(x < self.stateCongmanDict.count){
print("restarted x = " + String(x))
if (self.stateCongmanDict[self.captured]! != [""]){
self.alreadyThere = true
break
}
else {
var c: Int = 0
var capturedDos: String = ""
while (c < self.repList.count - 1){
print("c = " + String(c))
self.ref = Database.database().reference(fromURL: "Redacted for privacy" + "/" + self.repList[c] + "/" + "State")
self.ref.observeSingleEvent(of: .value, with: { snapshot in
print(snapshot.value!)
let valString = snapshot.value! as? String
if (valString != nil){
capturedDos = String(valString!)
print("Noice")
}
else {
print("ya done f***** up")
}
})
if (capturedDos == self.captured){
print("DO YOU SEE ME!!!!")
self.stateCongmanDict[capturedDos]?.append(self.repList[i])
}
c = c + 1
}
}
x = x + 1
}
i = i + 1
}
DispatchQueue.main.asyncAfter(deadline: .now() + .seconds(6), execute: {
print("six second delay check state")
print("succeed if seen:" + String(describing: self.stateCongmanDict))
})
})
不幸的是它只是打印了一个空的口述：
六秒延迟检查状态
如果看到成功：
["": ["", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", ""]]
最佳答案
我认为你需要反复检查这些孩子，然后检查字典中是否已经存在状态，所以我认为你可以做这样的事情（我没有测试过，但是想法是一样的）：
var dictionary = [String: [String]]()
ref.observeSingleEvent(of: .value, with: { snapshot in
print(snapshot.childrenCount) // I got the expected number of items
let enumerator = snapshot.children
while let rest = enumerator.nextObject() as? DataSnapshot {
print(rest.value!)
let name = rest.key
if let value = rest.value as? [String: Any] {
let state = value["State"] as? String
if var repsArr = self.dictionary[state] as? [String] {
repsArr.append(name)
self.dictionary[state] = repsArr
}else {
let newRepsArr = [name]
self.dictionary[state] = newRepsArr
}
print("Dictionary Inside while loop: \(self.dictionary)") //watch dictionary build itself
}
}
print("Dictionary: \(self.dictionary)")
})
关于swift - 如何基于Firebase创建字典，但是定义的值是子节点，定义的值是父节点[Swift]，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/47046608/