ios - 为什么类中的变量返回 nil 而转储类返回所有内容？

Question

我刚开始在 iOS 中进行开发，我的类 Package 有一个奇怪的问题:

你看，print(data) 返回我的类(包含所有数据)，但是当我尝试使用单个变量时，它返回 nil。为什么以及如何修复它？

import RealmSwift

class Package:Object {
    var name:String?
    var code:String?
    var api:String?
    var created_at:NSDate?
    var updated_at:NSDate?
    var progress:[PackageStep] = [PackageStep()]

}

我正在使用 Realm.io 来存储数据库，Packages 从该库的 Object 扩展

Answer 1

Your properties must be declared as dynamic :

Realm model properties need the dynamic var attribute in order for these properties to become accessors for the underlying database data.

There are two exceptions to this: List and RealmOptional properties cannot be declared as dynamic because generic properties cannot be represented in the Objective-C runtime, which is used for dynamic dispatch of dynamic properties, and should always be declared with let.