iOS Bounds of UIView in ViewDidLoad - ios

Question

I wanted to use the bounds of a UIView to create a UILabel and add it to that UIView inside the viewDidLoad method, however, I have found that the bounds of UIView is still null inside viewDidLoad. But when I look at a demo app, the bounds of its UIView is already initialised in viewDidLoad.
In the interface I have
#interface ViewController : UIViewController
#property (weak, nonatomic) IBOutlet UIView *promotionView;
#end
And I am trying to do
- (void)viewDidLoad
{
[super viewDidLoad];
UIView *container = [[UIView alloc] initWithFrame:self.promotionView.bounds];
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(10, container.bounds.size.height-100, 320, 20)];
label.text = #"Promotion Title";
[container addSubview:label];
[self.promotionView addSubview: container];
}
but it doesn't work because the bounds of promotionView is null.

Answer 1

You can do it like this in viewDidAppear:
-(void)viewDidAppear:(BOOL)animated {
static int first = 1;
if (first) {
UIView *container = [[UIView alloc] initWithFrame:self.promotionView.bounds];
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(10, container.bounds.size.height-100, 320, 20)];
label.text = #"Promotion Title";
[container addSubview:label];
[self.promotionView addSubview: container];
first = 0;
}
}