macos – swift 3将字符串转换为objectID

我使用 swift 3和nsoutlineview.
我想将核心数据记录的objectID保存到文本字段中.
所以我必须将其转换为字符串：

txtFied.stringValue = "\(CoreData[outlineView.selectedRow].objectID)"

我怎样才能将它转换回NSManagedObjectID？

我通过持久性存储协调器的managedObjectID(forURIRepresentation :)方法完成了这个,如下所述：

// Convert NSManagedObjectID to a string, via the uriRepresentation method.
    let objectIDString = <your managed object ID>.uriRepresentation().absoluteString
    ...
    // Use the persistent store coordinator to transform the string back to an NSManagedObjectID.
    if let objectIDURL = URL(string: objectIDString) {
        let coordinator: NSPersistentStoreCoordinator = <reference to your persistent store coordinator>
        let managedObjectID = coordinator.managedObjectID(forURIRepresentation: objectIDURL)
    }