Retired Document
Important: This sample code may not represent best practices for current development. The project may use deprecated symbols and illustrate technologies and techniques that are no longer recommended.
AppDelegate.m
/* |
File: AppDelegate.m |
Abstract: The application delegate class used for adding our navigation controller. |
Version: 1.3 |
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*/ |
#import "AppDelegate.h" |
#import "Level1ViewController.h" |
NSString *kItemTitleKey = @"itemTitle"; // dictionary key for obtaining the item's title to display in each cell |
NSString *kChildrenKey = @"itemChildren"; // dictionary key for obtaining the item's children |
NSString *kCellIdentifier = @"MyIdentifier"; // the table view's cell identifier |
NSString *kRestoreLocationKey = @"RestoreLocation"; // preference key to obtain our restore location |
@implementation AppDelegate |
@synthesize window, outlineData, navigationController, savedLocation; |
- (id)init |
{ |
self = [super init]; |
if (self) |
{ |
// load the drill-down list content from the plist filem |
// this plist contains the outline mapping each level of the list hierarchy |
// |
NSString *path = [[NSBundle mainBundle] bundlePath]; |
NSString *finalPath = [path stringByAppendingPathComponent:@"outline.plist"]; |
outlineData = [[NSDictionary dictionaryWithContentsOfFile:finalPath] retain]; |
} |
return self; |
} |
- (void)dealloc |
{ |
[navigationController release]; |
[window release]; |
[outlineData release]; |
[savedLocation release]; |
[super dealloc]; |
} |
- (void)applicationDidFinishLaunching:(UIApplication *)application |
{ |
// fetch the top level items in our outline (level 1) |
NSArray *topLevel1Content = [outlineData objectForKey:kChildrenKey]; |
// give the top view controller its content |
((Level1ViewController*)navigationController.topViewController).listContent = topLevel1Content; |
// load the stored preference of the user's last location from a previous launch |
NSMutableArray *tempMutableCopy = [[[NSUserDefaults standardUserDefaults] objectForKey:kRestoreLocationKey] mutableCopy]; |
self.savedLocation = tempMutableCopy; |
[tempMutableCopy release]; |
if (savedLocation == nil) |
{ |
// user has not launched this app nor navigated to a particular level yet, start at level 1, with no selection |
savedLocation = [[NSMutableArray arrayWithObjects: |
[NSNumber numberWithInteger:-1], // item selection at 1st level (-1 = no selection) |
[NSNumber numberWithInteger:-1], // .. 2nd level |
[NSNumber numberWithInteger:-1], // .. 3rd level |
nil] retain]; |
} |
else |
{ |
NSInteger selection = [[savedLocation objectAtIndex:0] integerValue]; // read the saved selection at level 1 |
if (selection != -1) |
{ |
// user was last at level 2 or deeper |
// |
// note: this starts a chain reaction down each level (2nd, 3rd, etc.) |
// so that each level restores itself and pushes further down until there's no further stored selections. |
// |
[(Level1ViewController*)navigationController.topViewController restoreLevel:topLevel1Content withSelectionArray:savedLocation]; |
} |
else |
{ |
// no saved selection, so user was at level 1 the last time |
} |
} |
// add the navigation controller's view to the window |
[window addSubview:[navigationController view]]; |
[window makeKeyAndVisible]; |
// register our preference selection data to be archived |
NSDictionary *savedLocationDict = [NSDictionary dictionaryWithObject:savedLocation forKey:kRestoreLocationKey]; |
[[NSUserDefaults standardUserDefaults] registerDefaults:savedLocationDict]; |
[[NSUserDefaults standardUserDefaults] synchronize]; |
} |
@end |
Copyright © 2010 Apple Inc. All Rights Reserved. Terms of Use | Privacy Policy | Updated: 2010-06-24