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.
Level3ViewController.m
/* |
File: Level3ViewController.m |
Abstract: The application's level 3 view controller. |
Version: 1.3 |
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*/ |
#import "AppDelegate.h" |
#import "Level3ViewController.h" |
#import "LeafViewController.h" |
@implementation Level3ViewController |
NSString *kLevel3TitlePage = @"Level 3"; |
@synthesize listContent, leafViewController, myTableView; |
- (void)dealloc |
{ |
[myTableView release]; |
[listContent release]; |
[super dealloc]; |
} |
- (void)awakeFromNib |
{ |
self.title = @"Level 3"; |
} |
#pragma mark UIViewController delegates |
- (void)viewWillAppear:(BOOL)animated |
{ |
[myTableView reloadData]; // populate our table's data |
NSIndexPath *tableSelection = [myTableView indexPathForSelectedRow]; |
[myTableView deselectRowAtIndexPath:tableSelection animated:NO]; |
} |
#pragma mark UITableView delegates |
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView |
{ |
return 1; |
} |
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section |
{ |
return [listContent count]; |
} |
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath |
{ |
// save off this level's selection to our AppDelegate |
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate]; |
[appDelegate.savedLocation replaceObjectAtIndex:2 withObject:[NSNumber numberWithInteger:indexPath.row]]; |
leafViewController.title = [[listContent objectAtIndex:indexPath.row] objectForKey:kItemTitleKey]; |
// move to the leaf level |
[[self navigationController] pushViewController:leafViewController animated:YES]; |
// commit the drill down location preference setting |
[[NSUserDefaults standardUserDefaults] setObject:appDelegate.savedLocation forKey:kRestoreLocationKey]; |
} |
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath |
{ |
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:kCellIdentifier]; |
if (cell == nil) |
{ |
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:kCellIdentifier] autorelease]; |
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; |
} |
// get the view controller's info dictionary based on the indexPath's row |
NSDictionary* item = [listContent objectAtIndex:indexPath.row]; |
cell.textLabel.text = [item objectForKey:kItemTitleKey]; |
return cell; |
} |
// User was last at level 3 or at a leaf page |
// |
// note: this is a part of a chain reaction down each level. |
// so that each level restores itself and pushes further down until there's no further stored selections. |
// |
- (void)restoreLevel:(NSArray*)items withSelectionArray:(NSArray *)selectionArray |
{ |
// user was last at level 3 or at a leaf page |
// |
self.listContent = items; // remember our content here at level 1 in case user navigates back to this level |
NSInteger itemIdx = [[selectionArray objectAtIndex:0] integerValue]; |
if (itemIdx != -1) |
{ |
leafViewController.title = [[listContent objectAtIndex:itemIdx] objectForKey:kItemTitleKey]; |
// we have a selection, move one more level deep and restore its content |
// (not animated since the user should not see the restore process) |
[[self navigationController] pushViewController:leafViewController animated:NO]; |
} |
} |
- (void)viewDidAppear:(BOOL)animated |
{ |
// we have moved to level 3, remove it's stored selection |
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate]; |
[appDelegate.savedLocation replaceObjectAtIndex:2 withObject:[NSNumber numberWithInteger:-1]]; |
// commit the drill down location preference setting |
[[NSUserDefaults standardUserDefaults] setObject:appDelegate.savedLocation forKey:kRestoreLocationKey]; |
} |
@end |
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