Realm swift:重新启动应用后清空realm

Question

我开始了一个新的项目，并试图实现Realm，但我无法让它正常工作。我的问题是，当我关闭我的应用程序并重新启动它时，我之前添加的所有对象都消失了，并且我从realm.objects得到的结果是空的。

class RealmManager {
     

static let shared = RealmManager()

let realm: Realm

init() {
    realm = try! Realm()
}

func write(_ completion: ()->Void) {
    do {
        try realm.write() {
            completion()
        }
    } catch {
        print(error)
    }
}

func add(_ object: Object) {
    realm.add(object)
}

func delete(_ object: Object) {
    realm.delete(object)
}

func objects<Element>(_ type: Element.Type) -> Results<Element> where Element : Object {
    return realm.objects(type)
}
}

我创建了这个单例，这样我就不必在代码中到处重复这个realm = try! Realm()。我在另一个项目中有一个完全相同的类，它工作得很好。

我的模型是这样的：

class PrepFile: Object {


@objc dynamic var creationDate: Date = Date()
@objc dynamic var lastModificationDate: Date = Date()
@objc dynamic var title: String = "Pas de titre"

@objc dynamic var activityKind: String = ""
@objc dynamic var seanceNumber: Int = 0
@objc dynamic var level: String = ""
@objc dynamic var duration: Int = 0
@objc dynamic var date: Date = Date()
@objc dynamic var cycle: Int = 0

@objc dynamic var mainGoal: String = ""
@objc dynamic var specificGoal: String = ""
@objc dynamic var material: String = ""

@objc dynamic var isDraft: Bool = true

convenience init(title: String? = nil, activityKind: String? = nil, seanceNumber: Int? = nil, level: String? = nil, duration: Int? = nil, date: Date? = nil, cycle: Int? = nil, mainGoal: String? = nil, specificGoal: String? = nil, material: String? = nil, phases: [Phase] = [], isDraft: Bool = true) {
    self.init()
    if let tt = title {
        self.title = tt
    }
    if let ak = activityKind {
        self.activityKind = ak
    }
    if let sn = seanceNumber {
        self.seanceNumber = sn
    }
    if let lv = level {
        self.level = lv
    }
    if let dt = duration {
        self.duration = dt
    }
    if let dt = date {
        self.date = dt
    }
    if let cl = cycle {
        self.cycle = cl
    }
    if let mg = mainGoal {
        self.mainGoal = mg
    }
    if let sg = specificGoal {
        self.specificGoal = sg
    }
    if let mt = material {
        self.material = mt
    }
    self.isDraft = isDraft
}

required init() {
}
}

然后，在我的VC中，我是这样做的：

class PrepFileListViewController: UIViewController {


@IBOutlet weak var tableView: UITableView!

lazy var prepFiles: Results<PrepFile> = { RealmManager.shared.objects(PrepFile.self) }()
var completePrepFiles: [PrepFile] = []
var draftPrepFiles: [PrepFile] = []

override func viewDidLoad() {
    super.viewDidLoad()
    tableView.delegate = self
    tableView.dataSource = self
    
    RealmManager.shared.write {
        for file in prepFiles {
            RealmManager.shared.delete(file)
        }
    }
    RealmManager.shared.write() {
        RealmManager.shared.add(PrepFile(title: "Fiche de prep 1"))
        RealmManager.shared.add(PrepFile(title: "Fiche de prep 2"))
        RealmManager.shared.add(PrepFile(title: "Fiche de prep 3"))
        RealmManager.shared.add(PrepFile(title: "Fiche de prep 4"))
        RealmManager.shared.add(PrepFile(title: "Fiche de prep 5"))
    }
}

override func viewWillAppear(_ animated: Bool) {
    prepFiles = RealmManager.shared.objects(PrepFile.self)
    completePrepFiles = prepFiles.filter({ !$0.isDraft })
    draftPrepFiles = prepFiles.filter({ $0.isDraft })
    tableView.reloadData()
}
}

现在，当我运行这段代码时，它工作得很好。我的PrepFile被添加到Realm中，我可以用我的RealmManager.shared.objects(PrepFile.self)来检索它们。现在，我注释了在viewDidLoad中删除/添加文件但什么也得不到的部分。我没有从RealmManager.shared.objects(PrepFile.self)获得空对象，我得到了一个空结果，就像没有任何东西被保存在那里一样。

我做错了什么？

我正在使用Xcode12，并在iPhone 11 / 13.3模拟器上运行我的应用程序。领域版本为5.5.0。

Answer 1

嗯，根据我的猜测，你要么在其他地方将realm的配置设置为"inMemoryIdentifier“，要么在应用程序的请求时没有使用fileURL设置正确的配置。配置本地领域：https://realm.io/docs/swift/latest/#realms