Custom UIViewController add issue - ios

Question

I Created a UIViewController that I want to add on the top of all of my views, the problem is that it's visible for only 1 sec and then disappears from the screen and deallocated. Why this is happening?
This is my code:
- (void)show
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.windowLevel = UIWindowLevelAlert;
self.window.screen = [UIScreen mainScreen];
[self.window makeKeyAndVisible];
UIWindow *mainWindow = [[[UIApplication sharedApplication] delegate] window];
[mainWindow setUserInteractionEnabled:NO];
[self.window addSubview:self.view];
self.view.alpha = 0.0f;
self.backgroundImage.image = [self takeSnapshot];
[UIView animateWithDuration:0.2 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{
self.view.transform = CGAffineTransformIdentity;
self.view.alpha = 1.0f;
} completion:nil];
}
- (void)dealloc
{
NSLog(#"Screen deallocated.");
}

Answer 1

Looking at the graph of your objects,I assume self is some view controller.
your self.view is subview of Appdelegates UIWindow. When you do
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
your Appdelegate window gets released subsequently your view controller(self) will also be released.
So I would suggest you to retain UIWindow instance before actually releasing it.

Answer 2

You must save variable for your UIViewController in that place from where "show" method was called. For example - just create property…
#property (nonatomic, strong) CustomViewController *cvc;
Otherwise instance of your UIViewController will be released at the end of that method. Because your object won't have any strong references…

Answer 3

If you work with XIB, you can use this code: You have to create an UIView class, for example HeaderView. In your UIViewController [ I will call it BaseViewController] .h you have to add a property:
#property (nonatomic, strong) HeaderView *headerView;
and in .m you have to add this code:
- (id)init {
self = [super init];
if (self) {
[self configureMenuView:self];
}
return self;
}
- (void)configureMenuView:(UIViewController *)vc {
NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:#"HeaderView" owner:self options:nil];
for( id currentObject in topLevelObjects)
{
if([currentObject isKindOfClass:[HeaderView class]]) {
self.headerView = (BannerView *)currentObject;
self.headerView.frame = CGRectMake(0, 0, 768, 1024);
self.headerView.backgroundColor = [UIColor clearColor];
[vc.view addSubview:self.headerView];
break;
}
}
[self.bannerView.closeHeaderButton addTarget:self action:#selector(closeHeaderrView) forControlEvents:UIControlEventTouchUpInside]; // it's only an example if you want add some button in your header.
So, in every view controller you have to import this class: BaseViewContoller and to add it like parent:
#interface TestViewController : HeaderViewController
Hope it works for you :)