Cover by Alasdair Allan

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Adding Navigation Controls to the Application

Next, back out the changes you just made to the tableView:didSelectRowAtIndexPath: method by deleting the lines you added in the preceding section (be careful to not remove the call to deselectRowAtIndexPath).

Now, let’s wrap this app up properly. This means we have to add a UINavigationController to the application. If you’ve used many iPhone apps, you’ll be familiar with this interface; it’s one of the most commonly used iPhone design interface patterns. Clicking on a cell in the table view makes the current view slide to the left and a new view is displayed. You return to the original table view by clicking on the Back button.

The first thing you need to do is add an IBOutlet to a UINavigationController to the app delegate interface (CityGuideDelegate.h):

#import <UIKit/UIKit.h>

@class RootController;

@interface CityGuideDelegate : NSObject <UIApplicationDelegate> {
    UIWindow *window;
    RootController *viewController;
    NSMutableArray *cities;
    UINavigationController *navController;
}

@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet RootController *viewController;
@property (nonatomic, retain) IBOutlet UINavigationController *navController;
@property (nonatomic, retain) NSMutableArray *cities;

@end

You also need to make some modifications to the app delegate implementation (CityGuideDelegate.m). Add a new line of code near the top to @synthesize the new property:

@synthesize window; @synthesize ...

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