Question

I have two view controllers, call them viewA and ViewB

• All the action happens in main view – ViewA
• A menu button is hit, brings up ViewB, all is well and the menu comes up

Now, the user touches one IBAction button, which programmatically just needs to:

1. change the value of a BOOL, call it myBOOL to YES
2. dismiss ViewB
3. pass the myBOOL variables current state of YES back to ViewA

I have declared the same BOOL, set property, synthesized on both Views, but per my NSLog upon dismissal of ViewB and loading back up ViewA, it reverts back to NO

So I know I’m going off on a tangent, I just want to know if you can send the value of a BOOL between two controllers and if so, please show me an example… as searches have found Protocols and Delegate examples with NSString‘s, and when I attempt with a BOOL I get stuck in an import loop, however I’ve read that its possible to make a global BOOL, as bad design as it is, I just need to get over this block for now.

Answer 1

There is View-independent value keeping tool. You can use:

[[NSUserDefaults standardUserDefaults]setObject:<#(id)#> forKey:<#(NSString *)#>]

For example, you inputs strings or datas in A view, you can store them in above variables. And then, in B view, you can use them by below code:

 [[NSUserDefaults standardUserDefaults]objectOrKey:<#(NSString *)#>]

These are a example of NSUserDefaults data using:

View A:

- (void)textFieldDidEndEditing:(UITextField *)sender
    {
        if (sender == homepage) {
            [[NSUserDefaults standardUserDefaults]
             setURL:[NSURL URLWithString:homepage.text] forKey:Ever5secHomepagePrefKey];
            if( [homepage canResignFirstResponder] ) {
                [homepage resignFirstResponder];   
            }
        } else if (sender == userId) {
            [[NSUserDefaults standardUserDefaults]
             setObject:userId.text forKey:Ever5secUserIdPrefKey];
objectForKey:Ever5secUserIdPrefKey]);
            if( [userId canResignFirstResponder] ) {
                [userId resignFirstResponder];   
            }
        } else if (sender == password) {
            [[NSUserDefaults standardUserDefaults]
             setObject:password.text forKey:Ever5secPasswordPrefKey];
            if( [password canResignFirstResponder] ) {
                [password resignFirstResponder];   
            }
        }
    }

View B:

userId.text = [[NSUserDefaults standardUserDefaults]
               objectForKey:Ever5secUserIdPrefKey];
password.text = [[NSUserDefaults standardUserDefaults]
                 objectForKey:Ever5secPasswordPrefKey];
homepage.text = [[[NSUserDefaults standardUserDefaults]
                  URLForKey:Ever5secHomepagePrefKey]
                 description];