three20 URL-Based Navigation

1：原文摘自：http://three20.info/article/2010-10-06-URL-Based-Navigation#troubleshooting

Navigation in iPhone apps can be challenging - there is no single prescribed way to open a view and pass data into it. Most applications rely on each view having a particular API that the callers must know. This leads to a lot of boilerplate code to open the same view from multiple locations in your application.

The URL-based navigation in TTNavigator provides a standard way to navigate the user from one view to another, with built-in understanding of some of the standard iPhone interfaces like UINavigationController,UITabBarController, and more.

Table of Contents

• Introduction
• Persistence
• URL mapping methods
• Native parameters
• Troubleshooting

Introduction

The concept behind TTNavigator is similar to Ruby on Rails' routing in that you link URL patterns to code in a url map. Callers simply request a url, and TTNavigator will find the appropriate code to run. This means that the url map makes a semantic distinction between what you want to display, and how you want to display it. The most common pattern is to have a single, shared navigator used across your whole application.

Here's an example to get started. Typically this appears in your Application Delegate'sapplicationDidFinishLaunching: selector.

TTNavigator* navigator = [TTNavigator navigator];

navigator.window = window;

TTURLMap* map = navigator.URLMap;

[map          from:@"tt://restaurant/(initWithName:)"

toViewController:[RestaurantController class]];