在视图控制器之间传递数据

问题：

I'm new to iOS and Objective-C and the whole MVC paradigm and I'm stuck with the following: 我是iOS和Objective-C以及整个MVC范例的新手，但我坚持以下几点：

I have a view that acts as a data entry form and I want to give the user the option to select multiple products. 我有一个充当数据输入表单的视图，我想给用户选择多个产品的选项。 The products are listed on another view with a UITableViewController and I have enabled multiple selections. 这些产品在另一个带有UITableViewController视图中列出，并且我启用了多个选择。

My question is, how do I transfer the data from one view to another? 我的问题是，如何将数据从一个视图传输到另一个视图？ I will be holding the selections on the UITableView in an array, but how do I then pass that back to the previous data entry form view so it can be saved along with the other data to Core Data on submission of the form? 我将在数组中的UITableView上保留选择，但是如何将其传递回先前的数据输入表单视图，以便在提交表单时将其与其他数据一起保存到Core Data？

I have surfed around and seen some people declare an array in the app delegate. 我到处逛逛，看到有人在应用程序委托中声明了一个数组。 I read something about Singletons but don't understand what these are and I read something about creating a data model. 我读了一些有关Singletons的内容，但不了解它们是什么，并且读了一些有关创建数据模型的知识。

What would be the correct way of performing this and how would I go about it? 什么是执行此操作的正确方法，我将如何处理？