Display UIView subclass which contains other UIViews - objective-c

Question

I want to package some UIViews suchs as UIButton, UIImageView in a single UIView.
When I try to display that view, it is not showing up on my RootViewController:
Here is the code of my UIView subclass :
#import "Hover.h"
#implementation Hover
- (id)init{
self = [super init];
if (self) {
// Initialization code
UIImage *hover = [UIImage imageNamed:#"Hover.png"];
UIImageView *imageView = [[UIImageView alloc] init];
imageView.image = hover;
imageView.frame = CGRectMake(0, 0, hover.size.width, hover.size.height);
imageView.alpha = 0.75;
[self addSubview:imageView];
[imageView release];
}
return self;
}
And here is the RootViewController class:
- (void)viewDidLoad
{
Hover *hover = [[Hover alloc] init];
[self.navigationController.view addSubview:hover];
[hover release];
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
The "hover view" is not displayed! However, when I add a single UIImageView to my RootViewController, it works!

Answer 1

In order for your view to display, you should override the -(id)initWithFrame:(CGRect)frame;, instead of writing a custom initializer.
Try this way :
-(id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if(self) {
// do init here...
}
return self;
}
Also, in the -(void)viewDidLoad; method, first send [super viewDidLoad];, and then alloc/init the view.

Answer 2

- (void)viewDidLoad
{
[super viewDidLoad];
Hover *hover = [[Hover alloc] init];
[self.navigationController.visibleViewController.view addSubview:hover];
[hover release];
// Do any additional setup after loading the view, typically from a nib.
}

Answer 3

Just a quick guess at a glance: If you're using a navigationcontroller, you should initWithRootViewController. You can't add a view to a navigationcontroller directly, Use push instead.
HTH
Marcus