iPhone操作系统实用程序 - Flipside视图和主视图通信 [英] iPhone OS Utility App - Flipside View and Main View communication

问题描述

我目前正在使用iPhone 2.1应用程式。我是来自Java背景的Objective C的新功能。

I am currently working on an iPhone 2.1 application. I am new to Objective C, coming from a Java background.

我的应用程序有一个基础的Xcode中使用iPhone SDK的Utility应用程序模板。目前我有一些控件，如UISlider和文本框，在FlipsideView。 UISlider已经有一个方法，当值改变时，使用目标和选择器被调用。但是，我也想从MainView中读取UISlider和文本框的当前（或最后）值。

My application has as a base the Utility Application template available in Xcode with the iPhone SDK. Currently I have some controls, such as an UISlider and text box, in the FlipsideView. The UISlider already has a method which is being called when the value changes, using targets and selectors. However, I would also like to be able to read, from the MainView, the current (or last) value of the UISlider and textbox.

请记住我是新的在Mac上的开发，并希望任何指导，我应该在哪里查找这些信息，无论是通过使用代表，或者我缺少一个明显的模板的结构中的一些东西。

Keep in mind I am new to development on a Mac, and would appreciate any guidance as to where I should look up such information, be it through the use of delegates or perhaps I am missing something obvious in the structure of the template.

更新：
我看看结构，并有一些更多的细节：UISlider正在FlipsideView.m中创建。我注意到完成按钮是从RootViewController.m创建的，也许我应该移动UISlider代码。我可能不正确地使用视图来保存在控制器中更合适的代码。

UPDATE: I am taking a look at the structure and have some more details: The UISlider is being created in FlipsideView.m. I noticed that the Done button is created from RootViewController.m and probably I should move the UISlider code over there. I may incorrectly be using the View to keep code that would be more appropiate in a Controller.

推荐答案

基础对象与控制器的值。一般来说，滑块属于视图层 - 它是一个显示元素。然而，调整滑块产生的动作是控制器的一个组件，它应该回到你的模型中来更新一个值。我强烈建议在一张纸上绘图箱，并尽量为应用程序的图层生成一个清晰的分隔 - 在这种情况下，将为该实用程序的每个侧生成两个视图，通过控制器，到模型。然后，移动滑块的动作将立即更新背面的模型。 iPhone开发者网站上的Cocoa Fundamental视频演示了这个效果很好。

Ultimately you should be updating some underlying object with the values from the controller. In general, the slider belongs in the view layer - it's a display element. The action that adjusting the slider produces, however, is a component of the controller and it should fire back into your model to update a value. I highly recommend drawing boxes on a sheet of paper and trying to produce a clean a separation as possible for your application's layers - doing so in this case would produce two views for each "side" of the utility which would, via a controller, relate to a model. Then, the act of moving the slider would "instantly" update the model on the back. The Cocoa Fundamental video on the iPhone developer site demonstrates this to great effect.

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