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A navigation controller maintains a stack of view controllers. Any kind of view controller is fair game for the stack. When you design your navigation controller, you ll need to specify the very first view the user sees. That view is the bottommost view in the view hierarchy and its control ler is called the root view controller. The root view controller is the very first view controller the navigation controller pushes onto its stack. As the user selects the next view to look at, a new view controller is pushed onto the stack, and the view it controls is shown to the user. We refer to these new view controllers as subcontrollers. As you ll see, this chapter s application, Nav, is made up of a navigation controller and six subcontrollers.

The provider web part class contains two properties that contain the values that will be passed as parameters to parameter consumer web parts. The implementation of those parameters is shown in the following code fragment:

self.soundListenerObject.objectPosition = translation; [self.soundListenerObject update];

Take a look at Figure 9 1. Notice the navigation button in the upper left corner of the current view. The navigation but ton is similar to a web browser s back button. When the user taps that button, the current view controller is popped off the stack, and the previous view becomes the current view. We love this design pattern. It allows you to build complex hierarchical applications iteratively. You don t have to know the entire hierarchy to get things up and running. Each con troller only needs to know about its child controllers so it can push the appropriate new controller object onto the stack when the user makes a selection. You can build up a large application from many small pieces this way, which is exactly what we re going to do in this chapter.

There is also a bug fix we need to apply. A little higher in the method, there is an early return statement in an if clause as an optimization. This will avoid updating our soundListenerObject if the method returns early, so we need to change this so it doesn t return early. We will just comment out the line. And to avoid any precision errors later in the code, let s explicitly set forwardMag to 0, since the threshold check considers small values to be 0.

if (forwardMag <= 0.0001) { if(YES == isThrusting) { [self.soundSourceObject stopSound]; } isThrusting = NO; // return; // we are not moving so return early forwardMag = 0.0; }

private string _strColumnA = ParametersProvider column A value ; public string ColumnA { get { return _strColumnA; } set { _strColumnA = value; } } private string _strColumnB = ParametersProvider column B value ; public string ColumnB { get { return _strColumnB; } set { _strColumnB = value; } } The implementation of the connection provider method returns an instance of an IWebPartParameters provider. The implementation looks like this: [ConnectionProvider( my parameters provider )] public IWebPartParameters GetParametersProvider() { return this; } As you are probably getting used to from the other examples implementing IWebPart* interfaces, you need to provide a schema for the data returned by the provider. You do this by implementing a Schema property that loops through all the properties in the ParametersProvider web part and adds them to a collection of property descriptors. The implementation for the Schema property is shown in the next code fragment: public System.ComponentModel.PropertyDescriptorCollection Schema { get { PropertyDescriptorCollection objProperties; PropertyDescriptor[] arrProperties = new PropertyDescriptor[Parameters.Count]; TypeDescriptor.GetProperties(this); objProperties = TypeDescriptor.GetProperties(this); int intParameterCount = 0; foreach (PropertyDescriptor objProperty in Parameters) { if (Parameters[objProperty.Name] != null ) { intParameterCount++; arrProperties[intParameterCount] = objProperty; } } objProperties = new PropertyDescriptorCollection(arrProperties); return objProperties; } } A parameters consumer web part must tell the provider which parameters it wishes to retrieve. To that end, the consumer will pass a collection of property descriptors to the provider.

The application we re about to build will show you how to do most of the common tasks associated with displaying a hierarchy of data. When the application launches, you ll be presented with a list of options (see Figure 9 2). Each of the rows in this top level view represents a different view controller that will get pushed onto the navigation controller s stack when that row is selected.