快速存储临时数据的最佳实践 [英] Best practice for storing temporary data in swift

问题描述

我开发了一个应用程序，可以从服务器 获取大量JSON数据并在不同的VC上显示.我所做的是获取数据并将设置数据为静态变量，这样我就可以访问我所有应用程序中的数据.

I have developed an app that gets a lot of JSON data from server and shows on different VCs.What I did was getting data and setting data to static variables, so I can access data in all my app.

现在我注意到我可以使用 CoreData 或 UserDefaults 代替 Static variables .

Now I noticed that I could have used CoreData or maybe UserDefaults instead of Static variables.

我的问题是这种类型的应用的最佳做法是什么?为什么准确?"

My question is "What is the best practice for this type of apps and why exactly?"

注意:该应用无需脱机工作，也无需保存数据即可在脱机模式下显示.

NOTE: The app doesn't need to work offline and save data for showing in offline mode.

推荐答案

您不应将数据存储到UserDefaults，用户默认值只是基于键值的文件，该文件主要用于存储有关用户的某些数据，例如:

You should not store data to UserDefaults, user defaults is just a key value based file which is mostly used to store some data about user, for example :

doNotShowAdds : true
isUserLogedIn :true.

您也不应该使用钥匙串，因为钥匙串是加密的容器，您可以在其中存储有关用户的评论者数据，例如:密码.

You should not use keychain either since keychain is encrypted container where u store critic data about user, for example : password.

您不需要使用数据库

我的意见是您不应该使用全局变量，主要是我尝试使viewController数据特定于其自身，不应从项目中的任何位置访问该数据. 何时在Swift中使用全局变量

My opinion is that you should not use global variables, mainly I try to make viewController data specific for itself, the data should not be accessed from anywhere in your project. When to use global variables in Swift

大多数情况下，我会通过特定视图控制器的实现来制定服务协议. 无论如何，每个控制器都应该有自己的一部分数据，例如

Mostly I make service protocols with implementations for specific view controllers. Anyways, each controller should have its own part of data for example

class MyViewControllerOne {
    private var data :Array<DataExampleOne>;
}

class MyViewControllerTwo {
    private var data :Array<DataExampleTwo>;
}

从API加载数据后，数据将一直存在，直到您关闭应用程序.

Once you load data from your API, the data will be there, until you close your app.

您总是可以制作另一个包含该数据的类，例如可能更干净的谓词:

You can always make another class which will contain this data and maybe predicates for cleaner approach for example :

protocol MyViewControllerOneService {
    func search() -> Array<DataExampleOne>;
}

class MyViewControllerOneServiceImpl :MyViewControllerService {
public var data :Array<DataExampleOne>;

public func search(searchString :String) -> Array<DataExampleOne>{
    let predicate = NSPredicate() ...
    let filteredArray = self.data.filter { evaluate...}
    return filteredArray;
    }
}

我使用类似的方法，而不是将数据保存在我的服务类(业务逻辑)中，而是使用了用于从数据库获取数据的存储库.由于您没有任何数据库，因此这种方法是可以的.

I use similar approach, instead of saving data in my service classes (business logic), I got repositories which I use to get data from database. Since you don't have any database this approach is okay.

，然后代替

class MyViewControllerOne {
    private var data :Array<DataExampleOne>;
}

您可以使用

class MyViewController {
    private var myViewControllerService :MyViewControllerOneServiceImpl;
}

希望有帮助， 最好的问候！

Hope it helps, Best regards!

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