Question

I am new to developing iOS apps. I am currently making an app which changes nib files.

However, after creating a new UIViewController subclass, with a XIB user interface, I cannot get the UIToolbar IBOutlet to work.

It may sound silly but the “UIToolbar” dosen’t go pink/purple in the header file (.h):

@property (nonatomic, retain) IBOutlet UIToolbar *toolbar;

Nor does the “_toolbar”, go blue/green, in the .m:

@synthesize toolbar = _toolbar;

This is causing me issue to use the UIToolbar.

Here is my code for the .h:

#import <UIKit/UIKit.h>

@interface pedestrians : UIViewController;

@property (nonatomic, retain) IBOutlet UIToolbar *toolbar;

@end

And for the .m:

#import "pedestrians.h"

@implementation pedestrians

@synthesize toolbar = _toolbar;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return YES;
}

@end

Any help would be great. Thanks.

EDIT:

Just tried to add a UIBar Button like this (not picking up any UI stuff):

Answer 1

The code you’ve written created two things relevant to your toolbar: an instance variable named _toolbar (coming from the synthesize statement), and the accessors at self.toolbar. You’re trying to use an instance variable named “toolbar” when no such thing exists. Either use _toolbar, or use self.toolbar. Preferably the latter, as it preserves key-value observing functionality and allows for better inheritance behaviors.