Type Definitions

The following type definitions are available globally.

  • A block type which provides both the old and new versions of an object in the Realm. Object properties can only be accessed using keyed subscripting.

    See

    -[RLMMigration enumerateObjects:block:]

    Declaration

    Objective-C

    typedef void (^RLMObjectMigrationBlock)(RLMObject *_Nullable,
                                        RLMObject *_Nullable)

    Swift

    typealias RLMObjectMigrationBlock = (RLMObject?, RLMObject?) -> Void

    Parameters

    oldObject

    The object from the original Realm (read-only).
    newObject

    The object from the migrated Realm (read-write).
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  • A callback block for RLMObject notifications.

    If the object is deleted from the managing Realm, the block is called with deleted set to YES and the other two arguments are nil. The block will never be called again after this.

    If the object is modified, the block will be called with deleted set to NO, a nil error, and an array of RLMPropertyChange objects which indicate which properties of the objects were modified.

    If an error occurs, deleted will be NO, changes will be nil, and error will include information about the error. The block will never be called again after an error occurs.

    Declaration

    Objective-C

    typedef void (^RLMObjectChangeBlock)(BOOL,
                                     NSArray<RLMPropertyChange *> *_Nullable,
                                     NSError *_Nullable)

    Swift

    typealias RLMObjectChangeBlock = (Bool, [RLMPropertyChange]?, Error?) -> Void
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  • A block called when opening a Realm for the first time during the life of a process to determine if it should be compacted before being returned to the user. It is passed the total file size (data + free space) and the total bytes used by data in the file.

    Return YES to indicate that an attempt to compact the file should be made. The compaction will be skipped if another process is accessing it.

    Declaration

    Objective-C

    typedef BOOL (^RLMShouldCompactOnLaunchBlock)(NSUInteger, NSUInteger)

    Swift

    typealias RLMShouldCompactOnLaunchBlock = (UInt, UInt) -> Bool
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  • A token representing an identity provider’s credentials.

    Declaration

    Objective-C

    typedef NSString *RLMSyncCredentialsToken

    Swift

    typealias RLMSyncCredentialsToken = NSString
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  • A type representing the unique identifier of a Realm Object Server identity provider.

    Declaration

    Objective-C

    typedef NSString *RLMIdentityProvider

    Swift

    typealias RLMIdentityProvider = NSString
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  • A block type representing a block which can be used to report a sync-related error to the application. If the error pertains to a specific session, that session will also be passed into the block.

    Declaration

    Objective-C

    typedef void (^RLMSyncErrorReportingBlock)(NSError *_Nonnull,
                                           RLMSyncSession *_Nullable)

    Swift

    typealias RLMSyncErrorReportingBlock = (Error, RLMSyncSession?) -> Void
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  • The type of a progress notification block intended for reporting a session’s network activity to the user.

    transferredBytes refers to the number of bytes that have been uploaded or downloaded. transferrableBytes refers to the total number of bytes transferred, and pending transfer.

    Declaration

    Objective-C

    typedef void (^RLMProgressNotificationBlock)(NSUInteger, NSUInteger)

    Swift

    typealias RLMProgressNotificationBlock = (UInt, UInt) -> Void
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Notification Constants

  • A notification indicating that changes were made to a Realm.

    Declaration

    Objective-C

    typedef NSString *RLMNotification
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  • A callback block for opening Realms asynchronously.

    Returns the Realm if the open was successful, or an error otherwise.

    Declaration

    Objective-C

    typedef void (^RLMAsyncOpenRealmCallback)(RLMRealm *_Nullable,
                                          NSError *_Nullable)
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  • The type of a block to run whenever the data within the Realm is modified.

    See

    -[RLMRealm addNotificationBlock:]

    Declaration

    Objective-C

    typedef void (^RLMNotificationBlock)(RLMNotification _Nonnull,
                                     RLMRealm *_Nonnull)
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  • The type of a migration block used to migrate a Realm.

    Declaration

    Objective-C

    typedef void (^RLMMigrationBlock)(RLMMigration *_Nonnull, uint64_t)

    Parameters

    migration

    A RLMMigration object used to perform the migration. The migration object allows you to enumerate and alter any existing objects which require migration.
    oldSchemaVersion

    The schema version of the Realm being migrated.
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