我正在使用以下代码中的下标错误地获取此Firebase数据,但我无法弄清楚我做错了什么.我得到一个错误,即对于let uniqueID = each.value [“唯一ID事件编号”]的下标不明确使用！直线.
// Log user in
if let user = FIRAuth.auth()?.currentUser {
let uid = user.uid
// values for vars sevenDaysAgo and oneDayAgo set here
...
let historyRef = self.ref.child("historyForFeedbackLoop/\(uid)")
historyRef.queryOrdered(byChild: "Unix Date").queryStarting(atValue: sevenDaysAgo).queryEnding(atValue: oneDayAgo).observeSingleEvent(of: .value,with: { snapshot in
if (snapshot.value is NSNull) {
print("user data not found")
}
else {
if let snapDict = snapshot.value as? [String:AnyObject] {
for each in snapDict {
// Save the IDs to array.
let uniqueID = each.value["Unique ID Event Number"] as! Int
self.arrayOfUserSearchHistoryIDs.append(uniqueID)
}
}
else{
print("SnapDict is null")
}
}
})
}
我尝试应用我从这个post中学到的东西,但我无法弄清楚我错过了什么,因为我以为我让编译器知道它是什么类型的字典“as？[String：AnyObject]”
任何想法或想法将不胜感激！
我处理数据的首选方法是尽可能晚地打开FIRDataSnapshot.
原文链接：https://www.f2er.com/swift/320088.htmlref!.observe(.value,with: { (snapshot) in
for child in snapshot.children {
let msg = child as! FIRDataSnapshot
print("\(msg.key): \(msg.value!)")
let val = msg.value! as! [String:Any]
print("\(val["name"]!): \(val["message"]!)")
}
})
