How to make reference to a UIButton in viewDidLoad?

Question

This is my action UIButton:

-(IBAction)favoriteButtonPressed:(id)sender { if (favoriteButtonSelected == 0) { [sender setSelected:YES]; favoriteButtonSelected = 1; [sender setImage:[UIImage imageNamed:@"favoritedItem.png"]]; [selectedObject setValue:@"Yes" forKey:@"Favorite"]; } else { [sender setSelected:NO]; favoriteButtonSelected = 0; [sender setImage:[UIImage imageNamed:@"notFavorite.png"]]; [selectedObject setValue:@"No" forKey:@"Favorite"]; } }

How to make a reference to the button in viewDidLoad? To make the following code work:

- (void)viewDidLoad { [super viewDidLoad]; if ([[selectedObject valueForKey:@"Favorite"] isEqual:@"Yes"]) { [favoriteButton setImage:[UIImage imageNamed:@"favoritedItem.png"]]; [favoriteButton setSelected:YES]; favoriteButtonSelected = 1; } else { [favoriteButton setImage:[UIImage imageNamed:@"notFavorite.png"]]; [favoriteButton setSelected:NO]; favoriteButtonSelected = 0; } }

EDIT FOR PROGRESS:

Now I did like this: Ctrl-drag from UIButton to ViewController in Assistant Editor. Connection: Outlet, name: favoriteButton, type: UIButton, storage: weak. But errors still there. + error for synthesize & error in viewDidUnload.. suggestion?

The Assistant Editor header for View Controller with the added property from Ctrl-drag:

@interface DetailViewController : UIViewController { IBOutlet UIScrollView *viewScroller; } @property (nonatomic, strong) IBOutlet UILabel *mylLabel; @property (nonatomic, strong) NSString *selectedObj; @property (strong, nonatomic) NSArray *detailsDataSource; @property int detailIndex; @property (weak, nonatomic) IBOutlet UIButton *favoriteButton; //The added property @end

Pochi · Accepted Answer · 2012-08-10 01:25:17Z

2

Control drag from your button to the header of the viewcontroller to create a property. (You can do this while in assistant mode, second button on the top right)..

Then you can reference your button from wherever using that property

answered Aug 10, 2012 at 1:25

Pochi

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5 Comments

ingenspor Over a year ago

Ok thanks, I tried that but it didn't work.. Did like this: Ctrl-drag from UIButton to ViewController in Assistant Editor. Connection: Outlet, name: favoriteButton, type: UIButton, storage: strong. But errors still there. + error for synthesize & error in viewDidUnload.. suggestion?

Pochi Over a year ago

there shouldnt be an error, if you did that on the header xcode automatically creates the synthesize and nils it in the viewdidunload. are you sure the name is the same?

Pochi Over a year ago

the other option would be for you to create an IBOutlet by yourself on the header of that viewcontroller. make it like this @property (weak, nonatomic) IBOutlet UIButton *favoriteButton; Then control drag the button to the little box bellow the viewcontroller view, a list should appear and you will see favoriteButton there.

ingenspor Over a year ago

Yes, the name is the same. It adds the synthesize and nil, yes. But it adds no property in the .h. This property is only visible in assistant editor. Is this right behaviour? (I control drag from the button and creates the property in the window that pops up when I press the assistant editor button) see my edit.

Pochi Over a year ago

i just noticed and your code itself is wrong, a button cannot be set like that. if u want to change the image it must be [[favoriteButton setImage:<#(UIImage *)#> forState:<#(UIControlState)#>] ]; also change it for the Action method.

Selkie · Accepted Answer · 2012-08-10 01:26:45Z

2

What you need is an IBOutlet for the button.

You can ctrl+drag the button from XIB file to the header of this class, and create a IBOutlet property named favoriteButton.

answered Aug 10, 2012 at 1:26

Selkie

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2 Comments

ingenspor Over a year ago

Ok thanks, I tried that but it didn't work.. Did like this (using storyboard): Ctrl-drag from UIButton to ViewController in Assistant Editor. Connection: Outlet, name: favoriteButton, type: UIButton, storage: strong. But errors still there. + error for synthesize & error in viewDidUnload.. suggestion?

Selkie Over a year ago

As Luis Oscar said, Xcode should add those. If not, try synthesize button property by yourself and set it to nil in viewDidUnload.

deleted_user · Accepted Answer · 2012-08-10 06:00:34Z

Well unless you are using the latest version of Xcode you do need to @synthesize favorite button.

You really should post your error messages you are just making people guess.

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