[英]Firebase - Check if Username is taken failing
我正在嘗試檢查在我的應用中輸入的用戶名是否與我的Firebase數據庫中的任何用戶名匹配,如果是,請顯示標簽並禁用“繼續segue /”按鈕。
相反,我得到一個恆定的錯誤:
signal SIGABRT (lldb) // for app delegate
這是我的代碼:@IBAction func checkUsernameEntered(_ sender:UITextField){
let ref = FIRDatabase.database().reference(fromURL: "DATABASE_URL")
ref.child("users")
.queryOrdered(byChild: "kid/username")
.queryEqual(toValue: chooseUsernameTextField.text)
.observeSingleEvent(of: .value, with: { snapshot in
if !snapshot.exists(){
print("The username entered has not been previously registered. Tap 'Next' to proceed.")
self.bottomNextButtonThree.isEnabled = true
UIView.animate(withDuration: 0.6, delay: 0, options: .curveEaseOut, animations: { self.uhOhWarningLabel.alpha = 0 }, completion: nil)
}
else
{
print("The entered username has been previously registered. Re-enter to proceed.")
self.bottomNextButtonThree.isEnabled = false
UIView.animate(withDuration: 0.6, delay: 0, options: .curveEaseOut, animations: { self.uhOhWarningLabel.alpha = 1.0 }, completion: nil)
}
})
這是我在firebase上的數據庫結構
任何幫助表示贊賞謝謝
這就是問題所在
let ref = FIRDatabase.database().reference(fromURL: "DATABASE_URL")
所以這樣做(只是一個粗略的例子)
class ViewController: UIViewController {
var ref: FIRDatabaseReference!
override func viewDidLoad() {
super.viewDidLoad()
ref = FIRDatabase.database().reference()
ref.child("test_key").setValue("test_value")
}
}
Firebase知道它的應用程序路徑,因為它在DATABASE_URL條目的GoogleService-Info.plist中定義。
這是Firebase網站在您在控制台中創建新App時創建的文件。
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