Question

我正在初始化我的领域实例：

private static let sUserRealm:Realm = try! Realm(configuration:Realm.Configuration(
        fileURL: Bundle.main.url(forResource: "user" ,withExtension: "realm"),
        inMemoryIdentifier: nil,
        syncConfiguration: nil,
        encryptionKey: nil,
        readOnly: false,
        schemaVersion: 0,
        migrationBlock: sMigrationBlock,
        deleteRealmIfMigrationNeeded: true,
        objectTypes: nil))

但是，我得到了这个错误：

fatal error: A Realm Configuration must specify a path or an in-memory 
identifier.: file /Users/realm/workspace/Package iOS Swift/tightdb_objc/RealmSwift/RealmConfiguration.swift, line 201

所有领域在他们关于创建多个领域的快速文档中都有this示例，甚至将其逐字复制也会引发相同的错误。如何创建和访问领域文件？

Answer 1

Bundle.url(forResource:withExtension:)返回指定包中现有文件的路径。您链接到的Realm文档部分使用了在应用包中包含Realm文件的示例。

由于您似乎尝试在特定路径上创建新 Realm文件，因此您应该计算该路径并将其设置为fileURL Realm.Configuration 1}}。您通常不希望使用Bundle API，因为应用程序包中的文件不可写。相反，您应该构建一个相对于您的应用程序文档或缓存目录的路径：

let documentDirectory = FileManager.default.url(for: .documentDirectory, in: .userDomainMask,
                                                appropriateFor: nil, create: false)
let url = documentDirectory.appendingPathComponent("my-new-realm.realm")

Answer 2

Swift 5：

只需自定义领域文件的名称

struct Kingdom {
    static let persist = Kingdom()

    let realm: Realm = { () -> Realm in
        var config = Realm.Configuration()
        config.fileURL = config.fileURL!.deletingLastPathComponent().appendingPathComponent("deng.realm")
        let land = try! Realm(configuration: config)
        return land
    }()
}

自定义领域文件的名称和路径

struct Kingdom {
    static let persist = Kingdom()

    let realm: Realm = { () -> Realm in
        let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
        let documentsDirectory = paths[0]
        let docURL = URL(string: documentsDirectory)!
        let dataPath = docURL.appendingPathComponent("Dng")
        if FileManager.default.fileExists(atPath: dataPath.absoluteString) == false{
            do {
                try FileManager.default.createDirectory(atPath: dataPath.absoluteString, withIntermediateDirectories: true, attributes: nil)
            } catch {
                print(error.localizedDescription)
            }
        }
        do {
            var config = Realm.Configuration()
            config.fileURL = dataPath.appendingPathComponent("deng.realm")
            let realmReal = try Realm(configuration: config)
            return realmReal
        } catch {
            print(error.localizedDescription)
            let realmForSyntax = try! Realm()
            return realmForSyntax
        }
    }()
}

Answer 3

使用 Bundle.main.url(forResource: "user" ,withExtension: "realm")!，但由于您的文件不存在，此值可能为nil

而不是 Bundle.main.url(forResource: "user" ,withExtension: "realm")

小心并设置

修改

要使用预定义数据库，您可以使用Bundle。

但是，如果您想为您的应用使用新数据库，请使用其他路径。不捆绑。

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

var config = Realm.Configuration() // Use the default directory, but replace the filename with the username config.fileURL = config.fileURL!.deletingLastPathComponent() .appendingPathComponent("\(username).realm")

比

sUserRealm:Realm = try! Realm(configuration:config)

或您想要的任何路径，但不是Bundle。

创建和编辑文件和目录：

let fileManager:FileManager = FileManager.default let documentdir:String = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).last! let dbName = someDataBaseFileName let yourFullFileName = String(format:"%@/%@",documentdir,dbName)

//或

let yourFullPath:String = URL(fileURLWithPath: documentdir).appendingPathComponent(dbName).path

Answer 4

这是我的Realm配置类，我遇到了Realm的这个问题，但终于解决了

 import Foundation
 import RealmSwift

 class RealmConfiguration {

    static let insensitiveDataEncryptionKey = "12345hamedhamedhamedhamedhamedhamedhamedhamedhamedhamedhamedhame" 

    static var sensitiveDataEncryptionKey = "hamedhamedhamedhamedhamedhamedhamedhamedhamedhamedhamedhamedhame"    

    public static var defaultDataConfiguration = Realm.Configuration.defaultConfiguration


    static func insensitiveDataConfiguration() -> Realm.Configuration {
        var config = Realm.Configuration()
        config.fileURL = config.fileURL!.deletingLastPathComponent().appendingPathComponent("insensitive.realm")
        config.encryptionKey = insensitiveDataEncryptionKey.data(using: String.Encoding.utf8, allowLossyConversion: false)
        return config
    }

    static func sensitiveDataConfiguration() -> Realm.Configuration {
        var config = Realm.Configuration()
        config.fileURL = config.fileURL!.deletingLastPathComponent().appendingPathComponent("sensitive.realm")
        config.encryptionKey = sensitiveDataEncryptionKey.data(using: String.Encoding.utf8, allowLossyConversion: false)
        return config
    }
}

如何创建自定义域文件

4 个答案: