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#import <UIKit/UIKit.h> @class RootViewController; @interface ViewHighScoresAppDelegate : NSObject <UIApplicationDelegate> { UIWindow *window; UINavigationController *navigationController; NSMutableData *responseData; NSXMLParser *highScoresParser; NSMutableArray *highScores; NSMutableDictionary *newScore; NSString *currentKey; NSMutableString *currentStringValue; RootViewController *rootViewController; } @property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) IBOutlet UINavigationController *navigationController;

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For those not familiar, the iPhone operating system has a background watchdog process that looks for memory use by sampling the system at frequent intervals Among other tasks, the watchdog is intended to protect the system s core phone functionality from third-party applications Should the watchdog identify a problem, the offending application receives several warnings before the system ultimately performs a shutdown The Brightkite drill-down among posts, people, and places signaled that our design would excessively consume memory Initially, we brainstormed ways to avoid the problem altogether For example, we considered limiting the allowable drill-down We finally decided that any artificial limit was not intuitive to the user and, therefore, unacceptable in our product In an infinite drill-down scenario, the memory curve continually increases until the iPhone operating system issues one or more memory warnings.

@property (nonatomic, retain) NSMutableArray *highScores; @property (nonatomic, retain) IBOutlet RootViewController *rootViewController; - (void)getHighScores; - (void)getHighScoresFromWebService:(NSString *)URLstr; - (void)parseHighScores:(NSData *)highScoresXMLData; @end

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The code in Listing 2-8 declares a few internal variables for use inside your app delegate instance messages. It also declares the messages getHighScores, getHighScoresFromWebService:, and parseHighScores:. Among the internal variables are the following:

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Our testing revealed that freeing unused application data at the time of the warning, through the didReceiveMemoryWarning method, failed to prevent memory shutdowns This is a key user experience point: a user can t tell the difference between a crash caused by a code defect and one that occurred at the hand of the memory watchdog We concluded that preventing the system from issuing an initial memory warning would substantially decrease the possibility of a memory shutdown We readily solved the memory problem by implementing a grandfather strategy In other words, as the user drills down, the tab bar controller frees the view controller on the grandparent stack rather than on the previous (parent stack) view controller Essentially, our tab bar controller must retain just enough data about the freed view controllers to rebuild the state, as the user taps the back button and traverses back up the stack.

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highScores: This is an array of NSDictionary instances. Each instance holds the full-

After implementation, the memory graph in Instruments revealed a static memory footprint instead of a steady climb Memory was allocated for a new view as the user tapped on a post, person, or place and, concurrently, the tab bar freed the grandparent view controller You might wonder why we went to such lengths for the Brightkite application As noted, we believed that any artificial limit intended to reduce the memory footprint would confuse the user We also discovered that, given the iPhone environmental conditions,.

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newScore: This is an NSMutableDictionary, which holds a single high-score record during XML processing. currentKey and currentStringValue: These hold values used during XML process-

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in some cases, even minimum drill-down could trip the operating system s watchdog. Our solution to virtually infinite drill-down also proved serviceable in our tab bar controller for switching between tabs. When we realized that the memory patterns of the tab bar were similar to the navigation controller, we implemented the grandparent strategy for tab switching as well.

ing, to add high scores to the newScore dictionary. Now that you have modified the interface to the app delegate, you need to make matching changes to the implementation. Open the ViewHighScoresAppDelegate.m file and modify it with the code marked in bold in Listing 2-9.