Adding Items to UIToolbar Programmatically Not Working

Question

I recently have been asking questions pertaining to UIToolbars and what not, but now I discover I need to add items to it programatically, I have seen other people's methods on how to go about doing it, but when I try doing the same thing, nothing ends up appearing. Pinpointing this problem is what I need help with. Here are my connections in IB:

And here is the relevant code:

Header file:

#import <UIKit/UIKit.h>

@interface ParkingRootViewController : UIViewController {
    UINavigationController *navigationController;
    UIToolbar *toolbar;
    UIBarButtonItem *lastUpdateLabel;
}

@property(nonatomic, retain) IBOutlet UINavigationController *navigationController;
@property (nonatomic, retain) IBOutlet UIToolbar *toolbar;
@property (nonatomic, retain) IBOutlet UIBarButtonItem *lastUpdateLabel;

- (IBAction)selectHome:(id)sender;

@end

Implementation file:

- (void)viewDidLoad {
        [super viewDidLoad];

    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 150.0f, 20.0f)];
    label.text = @"last updated...";
    label.textColor = [UIColor colorWithWhite:1.0 alpha:1.0];
    label.backgroundColor = [UIColor clearColor];
    label.textAlignment = UITextAlignmentCenter;
    label.font = [UIFont boldSystemFontOfSize:13.0];
    label.userInteractionEnabled = NO;

    lastUpdateLabel = [[UIBarButtonItem alloc] initWithCustomView:label];
    [label release];
    [toolbar setItems:[NSArray arrayWithObject:lastUpdateLabel]];


    [self.view addSubview:self.navigationController.view];
    //[self.view addSubview:toolbar];
    //[self.navigationController.view addSubview:toolbar];

    [self.navigationController.view setFrame:self.view.frame];

}

Any help is greatly appreciated!

EDIT:

I removed whatever I had in the nib which would cause the toolbar to appear/be modified and I updated my code in viewDidLoad to the following:

    self.navigationController.toolbarHidden = NO;

    //creating label in tool bar 
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 150.0f, 20.0f)];
    label.text = @"last updated...";
    label.textColor = [UIColor colorWithWhite:1.0 alpha:1.0];
    label.backgroundColor = [UIColor clearColor];
    label.textAlignment = UITextAlignmentCenter;
    //label.highlightedTextColor = [UIColor colorWithWhite:0.5 alpha:1.0];
    //label.highlighted = YES;
    label.font = [UIFont systemFontOfSize:13.0];
    label.userInteractionEnabled = NO;

    UIBarButtonItem *lastUpdateLabel = [[UIBarButtonItem alloc] initWithCustomView:label];
    //[lastUpdateLabel initWithCustomView:label];
    //[label release];
    //[toolbar setItems:[NSArray arrayWithObject:lastUpdateLabel]];
    [self setToolbarItems:[NSArray arrayWithObject:lastUpdateLabel]];

And I end up getting a blank toolbar showing up. I fire up the debugger and this is what I see: Aha! lastUpdateLabel's view's _text field is out of scope! But why? And how would I remedy this?

EDIT 2:

I have been able to add labels and an NSActivityIndicator with the following code:

@synthesize refreshDataButton;
//...
self.navigationController.toolbarHidden = NO;

    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(20.0f, 0.0f, 80.0f, 40.0f)];
    label.text = @"last updated...";
    label.textColor = [UIColor colorWithWhite:1.0 alpha:1.0];
    label.backgroundColor = [UIColor clearColor];
    label.textAlignment = UITextAlignmentCenter;
    label.font = [UIFont systemFontOfSize:13.0];
    label.userInteractionEnabled = NO;
    [self.toolbar addSubview:label];

// create activity indicator
    //                        dist frm lft, dist frm top
    CGRect frame = CGRectMake(   90.0,         11.0,      25.0, 25.0);      
    UIActivityIndicatorView *loading = [[UIActivityIndicatorView alloc] initWithFrame:frame];   
    loading.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhite; 
    [loading sizeToFit];    
    loading.autoresizingMask = (UIViewAutoresizingFlexibleLeftMargin | 
                                UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | 
                                UIViewAutoresizingFlexibleBottomMargin);    
    [loading startAnimating];

    [self.toolbar addSubview:loading];

But when I try to add a UIBarButtonItem I have no luck (doesn't show up in the toolbar):

self.refreshDataButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:100 target:self action:@selector(refreshDataButtonTapped)];
[self setToolbarItems:[NSArray arrayWithObject:refreshDataButton]];

Here is the header file:

 #import <UIKit/UIKit.h>
//#import <CoreData/CoreData.h>

@interface ParkingRootViewController : UIViewController {
    UINavigationController *navigationController;
    UIToolbar *toolbar;
    UIBarButtonItem *refreshDataButton;
    //UIActivityIndicatorView *loading;
}

@property (nonatomic, retain) IBOutlet UINavigationController *navigationController;
@property (nonatomic, retain) IBOutlet UIToolbar *toolbar;
@property (nonatomic, retain) UIBarButtonItem *refreshDataButton;
//@property (nonatomic, retain) IBOutlet UIActivityIndicatorView *loading;


@property (nonatomic, readonly) NSString *applicationDocumentsDirectory;

-(IBAction)selectHome:(id)sender;
-(void)testCoreData;
-(void)refreshDataButtonTapped;

@end

Answer 1

The code should work...there are couple of suggestions I could make. Instead of:

[toolbar setItems:[NSArray arrayWithObject:lastUpdateLabel]];

try this:

[toolbar setItems:[NSArray arrayWithObject:lastUpdateLabel] animated:YES];

Also, since you are using a UINavigationController, NavControllers come with their own toolbar that you could use if you like. By default it is hidden, which you can make visible by doing this:

self.navigationController.toolbarHidden = NO;

and you can set its toolbar items by doing this:

[self setToolbarItems:[NSArray arrayWithObject:lastUpdateLabel]];

Hope this tid bit helps you. good luck!

Answer 2

The buttons need to be added by the viewController that is pushed by the navigationController. The navController holds the bar, but the items on the bar are controlled (added) by the viewController that is being shown. That way, each different kind of vc has it's own bar.

So take that barbuttonitem code, and plunk it in the init section of the vc, and enjoy.