Friday, May 31, 2013

UIBarButtonItem UIBarButtonSystemItemUndo example in Objective C (iOS).


UIBarButtonItem UIBarButtonSystemItemUndo


UIBarButtonSystemItem
Defines system-supplied images for bar button items.

typedef enum {
UIBarButtonSystemItemDone,
UIBarButtonSystemItemCancel,
UIBarButtonSystemItemEdit,
UIBarButtonSystemItemSave,
UIBarButtonSystemItemAdd,
UIBarButtonSystemItemFlexibleSpace,
UIBarButtonSystemItemFixedSpace,
UIBarButtonSystemItemCompose,
UIBarButtonSystemItemReply,
UIBarButtonSystemItemAction,
UIBarButtonSystemItemOrganize,
UIBarButtonSystemItemBookmarks,
UIBarButtonSystemItemSearch,
UIBarButtonSystemItemRefresh,
UIBarButtonSystemItemStop,
UIBarButtonSystemItemCamera,
UIBarButtonSystemItemTrash,
UIBarButtonSystemItemPlay,
UIBarButtonSystemItemPause,
UIBarButtonSystemItemRewind,
UIBarButtonSystemItemFastForward,
UIBarButtonSystemItemUndo, // iOS 3.0 and later
UIBarButtonSystemItemRedo, // iOS 3.0 and later
UIBarButtonSystemItemPageCurl, // iOS 4.0 and later
} UIBarButtonSystemItem;

UIBarButtonItem UIBarButtonSystemItemUndo example.
- (void)viewDidLoad {

    //Title
    self.title = @"Advanced Search";
    [super viewDidLoad];   

    //undo button takes you back to main search options
    UIBarButtonItem *undoButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemUndo target:self action:@selector(undoButton:)];
    self.navigationItem.leftBarButtonItem = undoButton;
}

- (void)undoButton:sender {
    RootViewController *rootViewController = [[RootViewController alloc] init];
    UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:rootViewController];
    [[self navigationController] presentModalViewController:navigationController animated:YES];
    [navigationController release];
}

Example of [UIBarButtonItem UIBarButtonSystemItemUndo].
UIBarButtonItem *newUndoButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemUndo target:self action:@selector(addToFav)];

End of UIBarButtonItem UIBarButtonSystemItemUndo example article.