CODEWITHSUNDEEP
iosobjective-c
user2401221
user2401221

Reputation: 519

UIView addSubview works once but not twice

I would like to add a UIButton in a UIView from my xib file.

In my xib, I declare a UIView outlet named "content" with interface builder: here is the generated code :

@property (weak, nonatomic) IBOutlet UIView *content;

I would like to add a button, here is the code for this:

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setTitle:@"Show View" forState:UIControlStateNormal];
button.frame = CGRectMake(0, 8, 141.0, 56.0);
[button setBackgroundImage:[UIImage imageNamed:@"TAB_NORMAL"] 
                                      forState:UIControlStateNormal];
button.frame = CGRectMake(0, 8, 56.0, 141.0);
[self.content addSubview:button];

If I put this code in -viewDidLoad method, it works, but if I put it in a function called later, the button is never displayed.

What could be the reason ?

Thanks for your help.

Upvotes: 0

Views: 753

Answers (1)

David Hoerl
David Hoerl

Reputation: 41622

If your UIView content is a top level item, that is, not contained in your main view - then it has to be strong. Only items that are not top-level can use weak, since the containing view would keep a strong reference to them. I also assume that content was immediately added to the primary view, which kept a strong reference to it (it in viewDidLoad happened before ARC nil'ed out content.

If for some reason changing the property to strong does not fix the problem, then for sure add a NSLog (or assert) to insure that content is non-nil.

Upvotes: 1

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