Swift Firebase检查电子邮件是否已被使用 [英] Swift Firebase check if email is already in use
问题描述
我有一个简单的测试，如果它没有被使用过一个图像视图显示一个绿色的箭头，如果它已经被使用，那么它是红色的x
当我创建用户我使用下面的代码：
FIRAuth.auth（）?. createUser（withEmail：email，password：password，completion ：{（user，error）in
if error == nil {
self.ref.child（userEmails）。child（（user？.uid）！ ）.setValue（email）
FIRAuth.auth（）!. signIn（withEmail：email，
password：password）
} else {
//注册失败
}
我正在尝试检查是
pre $ func checkIfEmailExists（textField：UITextField）{
let ref = FIRDatabase.database（）。参考（）
让email = firstContainerTextField.text
ref.child（userEmails）。queryEqual（toValue：email）
.observe（.value，with：{snapshot in
$ b $ if（ self.firstContainerTextField.text？.isEmpty）！{
self.firstContainerImage.image = UIImage.init（named：emptyBlue.png）
} else if！（self.firstContainerTextField。 text.isEmpty）！&&！snapshot.exists（）{
self.firstContainerImage.image = UIImage.init（named：redEx.png）
} else if snapshot.exists（）{
self.firstContainerImage.image = UIImage.init（命名为：greenCheck.png）
}
}）;
$ p
$ b
到目前为止， test1@test.com存在的数据库。
有人可以告诉我我错过了什么吗？
编辑
我已经更新了我的代码。我正在使用hasChildren，我搜索了类似的问题，他们似乎指出了这个方向，但我仍然不能得到我要找的结果
func checkIfEmailExists（textField：UITextField）{
let ref = FIRDatabase.database（）。reference（）
let email = firstContainerTextField.text
ref.child（userEmails）。queryEqual（toValue：email）
.observe（.value，with：{snapshot in
if！ snapshot.hasChildren（）{
self.firstContainerImage.image = UIImage.init（命名为：redEx.png）
} else {
为快照.children.allObjects中的子节点！[FIRDataSnapshot] {
让tmp = child.value as！字符串
如果tmp == email {
self.firstContainerImage.image = UIImage.init（命名为：greenCheck.png）
}
}
}
}）;
编辑2
我改变了我设置用户的方式
self.ref.child（users） .child（（user？.uid）！）。setValue（[Email：email]）
所以现在我的数据库看起来像这样
users
***** uid *****
电子邮件：test@test.com
我之前评论过：你需要通过调用 snapshot.hasChildren（）来检查查询是否有结果。
< pre $ func checkIfEmailExists（textField：UITextField）{
let ref = FIRDatabase.database（）。reference（）
let email = firstContainerTextField.text
ref.child（userEmails）。queryEqual（toValue：email）
.observe（.value，其中：{snapshot in
if （！snapshot.hasChildren（））{
//用户还不存在...
}
} ）;
}
I want to be able to check if an email address is already been used (so if somebody put test1@test.com but another user already registered with that email account).
I have a simple test if it has NOT been used an image view shows a green arrow, if it HAS been used then it is red x
when I create the user I use the following code
FIRAuth.auth()?.createUser(withEmail: email, password: password, completion: { (user, error) in
if error == nil {
self.ref.child("userEmails").child((user?.uid)!).setValue(email)
FIRAuth.auth()!.signIn(withEmail: email,
password: password)
} else {
//registration failure
}
what I am trying to do to check is
func checkIfEmailExists(textField: UITextField) {
let ref = FIRDatabase.database().reference()
let email = firstContainerTextField.text ?? ""
ref.child("userEmails").queryEqual(toValue: email)
.observe(.value, with: { snapshot in
if (self.firstContainerTextField.text?.isEmpty)! {
self.firstContainerImage.image = UIImage.init(named: "emptyBlue.png")
} else if !(self.firstContainerTextField.text?.isEmpty)! && !snapshot.exists() {
self.firstContainerImage.image = UIImage.init(named: "redEx.png")
} else if snapshot.exists() {
self.firstContainerImage.image = UIImage.init(named: "greenCheck.png")
}
});
}
So far it does not work as I can see in my database that test1@test.com exists. Can somebody tell me what I missed?
EDIT
I have updated my code. I am using hasChildren and I searched for similar questions and they seem to point this direction, but I still cannot get the result I am looking for
func checkIfEmailExists(textField: UITextField) {
let ref = FIRDatabase.database().reference()
let email = firstContainerTextField.text ?? ""
ref.child("userEmails").queryEqual(toValue: email)
.observe(.value, with: { snapshot in
if !snapshot.hasChildren() {
self.firstContainerImage.image = UIImage.init(named: "redEx.png")
} else {
for child in snapshot.children.allObjects as! [FIRDataSnapshot] {
let tmp = child.value as! String
if tmp == email {
self.firstContainerImage.image = UIImage.init(named: "greenCheck.png")
}
}
}
});
}
Edit 2
I changed how I set my user up
self.ref.child("users").child((user?.uid)!).setValue(["Email": email])
so now my database looks like this
users
*****uid*****
Email: "test@test.com
As I commented earlier: you'll need to check whether the query has any results by calling snapshot.hasChildren().
func checkIfEmailExists(textField: UITextField) {
let ref = FIRDatabase.database().reference()
let email = firstContainerTextField.text ?? ""
ref.child("userEmails").queryEqual(toValue: email)
.observe(.value, with: { snapshot in
if (!snapshot.hasChildren()) {
// User doesn't exist yet...
}
});
}
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