Ios swift中现有用户的Firebase检查
我有一个VC,我正在创建一个新用户并添加到firebase。用户在数据库中插入没有问题,但是我在检查同名用户是否已经存在时遇到问题。我曾尝试在firebase中使用各种查询语句,但没有得到任何乐趣。有人知道我如何修改代码来实现这一点吗?这是:-Ios swift中现有用户的Firebase检查,ios,swift,firebase,Ios,Swift,Firebase,我有一个VC,我正在创建一个新用户并添加到firebase。用户在数据库中插入没有问题,但是我在检查同名用户是否已经存在时遇到问题。我曾尝试在firebase中使用各种查询语句,但没有得到任何乐趣。有人知道我如何修改代码来实现这一点吗?这是:- @IBAction func submitUsername(sender: AnyObject) { if let user = usernameTxtField.text where user != "" { let use
@IBAction func submitUsername(sender: AnyObject) {
if let user = usernameTxtField.text where user != "" {
let username = DataService.ds.REF_USERS.childByAppendingPath("username")
username.observeSingleEventOfType(.Value, withBlock: { snap in
if let usernameDoesNotExist = snap.value as? NSNull {
let currentUser = DataService.ds.REF_USER_CURRENT.childByAppendingPath("username")
self.usernameTxtField.text = user
currentUser.setValue(user)
}
})
dismissViewControllerAnimated(true, completion: nil)
} else {
showAlert("Username Needed", msg: "please choose a username")
}
}
以及firebase数据结构
"users" : {
"000591b6-ba88-4670-9cb7-edd79c273eab" : {
"newuser" : "added to FB",
"provider" : "password"
},
"05551c90-27fe-4969-b45d-279a72583857" : {
"newuser" : "added to FB",
"provider" : "password"
},
"0bbff1b0-681a-4fef-adc0-c4779a4b2100" : {
"provider" : "password",
"testing" : "emailtest",
"username" : "richy446"
},
"12f35e7a-2430-49b3-a287-f7b1daf6a121" : {
"newuser" : "added to FB",
"provider" : "password",
"username" : "richy445"
},
"15a45560-cc81-4c2d-bb59-b8ce6b125d68" : {
"provider" : "password",
"testing" : "emailtest",
"username" : "richy445"
},
"1c135936-6dd0-4189-bcd7-e8036e9736f9" : {
"newuser" : "added to FB",
"provider" : "password"
},
"21591e29-f083-452c-b74f-cc567cecb183" : {
"newuser" : "added to FB",
"provider" : "password"
},
"8b385aa7-0e80-426b-a385-5b3317c894d0" : {
"newuser" : "added to FB",
"provider" : "password",
"username" : "richy445"
}
}
检查重复数据有多种方法。您使用的Firebase结构似乎有点不一致,因此这样构造可能更容易
"000591b6-ba88-4670-9cb7-edd79c273eab" : {
"email" : "test@test.com",
"password" : "password"
},
"05551c90-27fe-4969-b45d-279a72583857" : {
"email" : "test2@test.com",
"password" : "password"
},
1) 让Firebase为您完成这项工作
创建用户时,如果用户名(电子邮件)已存在,Firebase将返回错误。在firebase中创建帐户之前,使用此方法将防止将随机数据写入firebase
myRootRef.createUser(email, password: pw, withValueCompletionBlock: { error, result in
if error != nil {
self.errMsgField.stringValue = "email/username in use, try again"
} else {
let uid = result["uid"] as! String //the uid of the new user
print("user created as \(uid)")
self.storedDataInUserNode(email, password:pw)
self.authUserWithAuthData( email, password: pw ) //auth the user
// and proceed in starting up the app
}
})
2) 正在检查Firebase中的现有数据
myRootRef.createUser(email, password: pw, withValueCompletionBlock: { error, result in
if error != nil {
self.errMsgField.stringValue = "email/username in use, try again"
} else {
let uid = result["uid"] as! String //the uid of the new user
print("user created as \(uid)")
self.storedDataInUserNode(email, password:pw)
self.authUserWithAuthData( email, password: pw ) //auth the user
// and proceed in starting up the app
}
})
当第一种方法首先停止写入数据时,如果您想检查重复数据,通常有一种模式:
let userName = the userName or email the user entered
let usersRef = Firebase(url:"https://test.firebaseio.com/users")
usersRef.queryOrderedByChild("email").queryEqualToValue("\(userName!)")
.observeSingleEventOfType(.Value, withBlock: { snapshot in
if ( snapshot.value is NSNull ) {
print("not found)") //didnt find it, ok to proceed
} else {
print(snapshot.value) //found it, stop!
}
}
DataSnapshot上有一个名为.exists()的方法,可以这样调用。 更新为Swift 4
struct ModelUser {
var id: String
var name: String
init(data: DataSnapshot) {
// do init stuff
}
}
func isUserRegistered(with id: String, completion: @escaping (_ exists: Bool, _ user: ModelUser?) -> ()) {
DatabaseReference.users.child(id).observeSingleEvent(of: .value) { (snapshot) in
if snapshot.exists() {
// user is already in our database
completion(true, ModelUser(data: snapshot))
} else {
// not in database
completion(false, nil)
}
}
}
您是询问如何检查Firebase中是否存在用户名(即登录凭据),还是询问如何查看/users节点中是否存在用户名?另外,发布你的Firebase结构(文本,请不要图片)有助于我们了解你的结构,并澄清你的问题。mainDict->posts->users->username这就是Firebase的结构,在username中,我想向我正在做的数据库添加一个用户,但如果已经使用了用户名,我不想添加用户(可能会显示某种类型的消息警报)这不是一个很好的存储用户名的结构。/users的子节点应该是uid,而该节点的子节点应该是用户名:“用户名”作为键:值对。这可能会导致其他问题,因为用户节点是posts节点的子节点。能否请您使用Firebase结构更新您的问题?这将使我们不必重新键入,也将澄清问题和问题。只是添加了它,希望在检查了name可用。关闭…请以文本形式发布(根据我上面的评论),而不是图像,这样我们就不必重新键入它。当您以文本形式发布时,它是可搜索的(图像不是),并将在将来帮助其他人。