问题描述
我得到警告“变量'userArray'从未被突变；请考虑将其更改为'let'常量”，并且由于某些原因我的变量没有被更改？我提供了一些打印语句，以尝试找出正在运行的内容和未运行的内容。打印内容如下：“附加用户-[]”，“找到[“测试用户”]“
static func getBossSubs(bossID: String,completion: @escaping (Result<UserNames,Error>) ->
()) {
let pred = NSPredicate(format: "uniqueID = %@",bossID)
let sort = NSSortDescriptor(key: "creationDate",ascending: false)
let query = CKQuery(recordType: RecordType.Users,predicate: pred)
query.sortDescriptors = [sort]
let operation = CKQueryOperation(query: query)
operation.desiredKeys = ["subscribedBosses"]
operation.resultsLimit = 50
operation.recordFetchedBlock = { record in
DispatchQueue.main.async {
guard let subs = record["subscribedBosses"] as? [String] else {
print("Error at screenName")
completion(.failure(CloudKitHelperError.castFailure))
return
}
var userArray = UserNames() //Error that it should be a LET is here.
for boss in subs{
CloudKitHelper.getBossScreenName(bossID: boss) { (result) in
switch result{
case .success(let name):
userArray.names.append(name) //works fine
print("Found \(userArray.names)") //Prints a name
case .failure(let er):
completion(.failure(er))
}
}
print("does this run?") // Only runs if No Name
completion(.success(userArray)) // contains no name or doesn't run?
}
}
}
operation.queryCompletionBlock = { (_,err) in
DispatchQueue.main.async {
if let err = err {
completion(.failure(err))
return
}
}
}
CKContainer.default().publicCloudDatabase.add(operation)
}
我这样称呼代码：
.onAppear {
// MARK: - fetch from CloudKit
self.userList.names = []
let myUserID = UserDefaults.standard.string(forKey: self.signInWithAppleManager.userIdentifierKey)!
// get my subs projects
CloudKitHelper.getBossSubs(bossID: myUserID) { (results) in
switch results{
case .success(let user):
print("Users appended")
self.userList.names = user.names
case .failure(let er):
print(er.localizedDescription)
}
}
}
解决方法
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