如何在不显示数据的情况下将数据传递给ViewController？

Question

i want to pass from a view controller 4 BOOL Values to my ChooseLevelVC:

if (_moves >=4) {
    clvc.level1Completed3 = 1;
}
if (_moves == 3) {
    clvc.level1Completed2 = 1;
}
if (_moves == 2) {
    clvc.level1Completed1 = 1;
} else
    clvc.level1Completed = 1;

But i don't want to present ChooseLevelVC. It should work in Background. This Bool Values changes the Image of Buttons in ChooseLevelVC.

My Code works fine if i present ChooseLevelVC with:

ChooseLevelViewController *clvc = [self.storyboard instantiateViewControllerWithIdentifier:@"chooseLevelViewController"];
if (_moves >=4) {
   clvc.level1Completed3 = 1;
}
if (_moves == 3) {
    clvc.level1Completed2 = 1;
}
if (_moves == 2) {
    clvc.level1Completed1 = 1;
 } else
    clvc.level1Completed = 1;
[self presentViewController:clvc animated:NO completion:^(){

 }];

if i don't present ChooseLevelVC, nothing happens. Do i have to save the Values? When yes, how?

thanks!

Answer 1

You'll need to store your ChooseLevelViewController in a local property:

@property (nonatomic, strong) ChooseLevelViewController *chooseLevelViewController;

... so that you can instantiate it once in viewDidLoad :

- (void)viewDidLoad{
    [super viewDidLoad];

    // This is the only place you need to instantiate this view controller!
    self.chooseLevelViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"chooseLevelViewController"];
}

... and then configure it as needed:

self.chooseLevelViewController.level1Completed1 = 1;

... eventually presenting it whenever you like:

[self presentViewController: self.chooseLevelViewController animated:NO];