Stopping a view from unloading its data - ios

Question

This may sound like a simple question, but yet I can't find an answer for it anywhere.
I am switching between views and everything is fine. I can pass variables and data between views, but the problem arises when I want to go back to a previous view.
Any data on the view is gone and deleted as if it hadn't been passed through. Of course, I don't want the data to unload when I switch to a new view. Is this possible?
This is how I am switching between views in my project. Is there a better way?
TicketStart *backPage=[[TicketStart alloc]initWithNibName:#"TicketStart" bundle:nil];
[self addChildViewController:backPage];
[self.view addSubview:backPage.view];
When I search this question all I can find are questions about passing things through or loading new views. Sorry if this question has been asked, but I can not find an answer anywhere.

Answer 1

I'm not sure what triggers your views to change, so you'll have to write that code.
Parent
#implementation ParentViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
self.vcOne = [[OneViewController alloc] init];
[self addChildViewController:self.vcOne];
[self.view addSubView:self.vcOne.view];
self.vcTwo = [[TwoViewController alloc] init];
}
-(void)switchViews {
//logic to animate in view that isn't present
}
#end
View Controller One
#interface OneViewController ()
#property(strong, nonatomic) UIView *vOne;
#end
#implementation OneViewController
-(UIView*)vOne {
if(_vOne == nil) {
_vOne = [[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, self.view.frame.size.width, self.view.frame.size.height)];
}
return _vOne;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
[self.view addSubView:self.vOne];
}
#end
View Controller Two
#interface TwoViewController ()
#property(strong, nonatomic) UIView *vTwo;
#end
#implementation TwoViewController
-(UIView*)vTwo {
if(_vTwo == nil) {
_vTwo = [[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, self.view.frame.size.width, self.view.frame.size.height)];
}
return _vTwo;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
[self.view addSubView:self.vTwo];
}
#end