我有一个简单的 firebase 数据库,我需要从中获取子值。如何获取子字段值?这是我的数据库:
Users
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FirstName: Mike
LastName: Smith
username: [email protected]
我一直在堆栈溢出,似乎没有什么能回答这个问题,但我知道这一定很容易。
import UIKit
import FirebaseDatabase
class CustProfileViewController: UIViewController {
var ref: DatabaseReference?
var tempName = ""
var tempFirstName = ""
@IBOutlet weak var username: UITextField!
@IBOutlet weak var firstName: UITextField!
@IBOutlet weak var editAddressButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
ref = Database.database().reference()
username.text = "[email protected]"
}
@IBAction func editAddressButtonPressed(_ sender: Any) {
self.ref?.child("Users").queryOrdered(byChild: "username").queryEqual(toValue: username.text!).observe(.value, with: { (snapShot) in
if (snapShot.value! is NSNull) {
print("nothing found")
} else {
print("found it!")
print(snapShot)
let snapShotValue = snapShot.value as! NSDictionary
let fName = snapShotValue["FirstName"] as? String
self.firstName.text = fName
print(self.firstName.text!)
}
})
}
}
我期望使用 fName 填充 firstName 文本框,但它返回一个 nil 值。
你可以试试
@IBAction func editAddressButtonPressed(_ sender: Any) {
self.ref?.child("Users").queryOrdered(byChild: "username").queryEqual(toValue: username.text!).observe(.value, with: { (snapShot) in
if !snapShot.exists() {
print("nothing found")
} else {
print("found it!")
print(snapShot)
let snapShotValue = snapShot.value as! [String:[String:Any]]
Array(snapShotValue.values).forEach {
let fName = $0["FirstName"] as! String
print(fName)
}
}
})
}
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我来说两句