我目前正在尝试从 Swift 中的子快照访问数据。这是我的代码(在 Swift 3/Firebase 更新之前有效):
if let achievements = snapshot1.childSnapshotForPath("Achievements").children.allObjects as? [FIRDataSnapshot] {
if achievements.count != 0 {
if let val = achievements[0].value!["somevalue"] as? Int {
self.dict["somevalue"] = val
}
}
所以我在这里尝试做的是创建子快照(成就)的变量，并从中访问子快照数据。 achievements[0] 只会返回第一个值。但是，这似乎不起作用。我应该如何处理这个问题？
我目前已经在快照中执行此操作('observeType:.ChildAdded')
我的 Firebase 数据库如下所示:
Achievements{
randomId1 {
somevalue : somevalue
}
randomId2 {
somevalue2 : somevalue2
}
}
更新代码:
func loadData() {
ref.child("Players").observe(FIRDataEventType.childAdded) { (snapshot:FIRDataSnapshot) in
if let value = snapshot.value as? [String:AnyObject], let username = value["Username"] as? String {
}
if let value = snapshot.value as? [String:AnyObject], let ranking = value["Rank"] as? String {
}
if let childSnapshot = snapshot.childSnapshot(forPath: "Achievements").children.allObjects as? [FIRDataSnapshot] {
if childSnapshot.count != 0 {
if let achievement1 = childSnapshot[0].value!["Rookie"] as? String {
print(achievement1)
}
}
}
}
}
JSON 树:
Players {
PlayerID {
Username
Rank
Achievements {
Rookie: yes
}
}
最佳答案
尝试:-
if let childSnapshot = snapshot.childSnapshot(forPath: "Achievements") as? FIRDataSnapshot{
if let achievementDictionary = childSnapshot.value as? [String:AnyObject] , achievementDictionary.count > 0{
if let achieveMedal = achievementDictionary["Rookie"] as? String {
print(achieveMedal)
}
}
}
关于ios - Swift Firebase 访问子快照数据，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39623524/