ios - Swift - 由于某种原因，Realm 在主线程上

Question

所以我正在重构一些代码，并且我有 Realm 的线程安全问题。

我有两层，第一层是本地存储:

class LocalStorage {

  static private var db: RealmDB = RealmDB.sharedInstance

  static func updateTest(_ object: [Object], async: Bool = true, success: @escaping () -> Void, failure: @escaping () -> Void) {
    if async {
        db.insertAsynctTest(object, success: {
            success()
        }) {
            failure()
        }
    } else {
        db.insertTest(object, success: {
            success()
        }) {
            failure()
        }
    }
  }
}

第二个是单音域:

class RealmDB {

// create OR update

static let sharedInstance = RealmDB()

var realm: Realm?

init() {
    do {
        self.realm = try Realm()

    } catch {
        handleError(error)
    }
}

func insertAsynctTest(_ objects: [Object], success: @escaping () -> Void, failure: @escaping () -> Void) {
    DispatchQueue(label: "com.example.myApp.bg").async {
        autoreleasepool {
            if let realmDB = self.realm {
                do {
                    try realmDB.write {
                        for object in objects {
                            realmDB.add(object, update: .modified)
                        }
                        success()
                    }
                } catch let error as NSError {
                    print("Something went wrong: \(error.localizedDescription)")
                    failure()
                }
            }
            failure()
        }
    }
}

然而，每次我使用本地存储 - Realm 时，我都对“从不正确的线程访问的 Realm ”感到不满

我曾尝试在同一个线程(“com.example.myApp.bg”)上初始化单例，但我仍然很迷恋。想了解那里的线程中发生了什么。

谢谢!

Answer 1

你不应该在不同的线程中使用 Realm 实例。每个线程都需要自己的实例。

Sharing Realm instances across threads is not supported. Realm instances accessing the same Realm file must also all use the same Realm.Configuration.

https://realm.io/docs/swift/latest/#threading

试试这个:

   DispatchQueue(label: "com.example.myApp.bg").async {
    autoreleasepool {
        if let realmDB = try? Realm() {
            do {
                try realmDB.write {
                    for object in objects {
                        realmDB.add(object, update: .modified)
                    }
                    success()
                }
            } catch let error as NSError {
                print("Something went wrong: \(error.localizedDescription)")
                failure()
            }
        }
        failure()
    }
}