你如何压缩iOS上的Realm DB？

正如您“定期”编写的那样,每个应用程序的启动可能已经足够,具体取决于您的用例.

在启动应用程序时,在专用的自动释放池中打开Realm仍然相对容易,将压缩的副本写入不同的路径并用它替换default.realm文件.

斯威夫特2.1

func compactRealm() {
    let defaultURL = Realm.Configuration.defaultConfiguration.fileURL!
    let defaultParentURL = defaultURl.URLBydeletingLastPathComponent!
    let compactedURL = defaultParentURl.URLByAppendingPathComponent("default-compact.realm")

    autoreleasepool {
        let realm = try! Realm()
        realm.writeCopyToPath(compactedURL)
    }
    try! NSFileManager.defaultManager().removeItemAtURL(defaultURL)
    try! NSFileManager.defaultManager().moveItemAtURL(compactedURL,toURL: defaultURL)
}

func application(application: UIApplication,didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    compactRealm()

    // further setup …

    return true
}

Swift 3.0

func compactRealm() {
    let defaultURL = Realm.Configuration.defaultConfiguration.fileURL!
    let defaultParentURL = defaultURl.deletingLastPathComponent()
    let compactedURL = defaultParentURl.appendingPathComponent("default-compact.realm")

    autoreleasepool {
        let realm = try! Realm()
        try! realm.writeCopy(toFile: compactedURL)
    }
    try! FileManager.default.removeItem(at: defaultURL)
    try! FileManager.default.moveItem(at: compactedURL,to: defaultURL)
}

func application(application: UIApplication,didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    compactRealm()

    // further setup …

    return true
}