Property Update not being saved from other view controller

Question

I have seen many many answers about this but for some reason it is not working for me. I have a property in file A, then in file B I set the variable to some value an on the viewdidappear on file A I /Run some code" based on what the variable was assigned to.

So. this is my code. (bare minimal) ViewController.H

@property(strong, nonatomic) NSString *option;

ViewController.M

-(void)viewDidAppear:(BOOL)animated
{
    NSLog(@"Has apeparsed");
    if ([_option isEqualToString:@"1"]) {

            [_map removeAnnotation:budAnno];
    }
}

ViewControllerB.h

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if ([[recipes objectAtIndex:indexPath.row] isEqualToString:@"TEST"])
    {
        ViewController *viewO =[[ViewController alloc]init];
        viewO.option=@"1";
    }
}

when this code is called in ViewControllerB Options is set to 1. but when I click BACK to viewContoller.M my if statement fails because it is back to nil. would like to know why this is done.

Hi, please see my answer here (http://stackoverflow.com/questions/24312447/calling-method-from-another-view-controller-not-working-c-objective-xcode/24315305#24315305)... Identical case. — danh, Dec 21 '14 at 01:39

score 3 · Accepted Answer · answered Dec 21 '14 at 01:39

The problem is that you are setting options to 1 on a NEW instance of view controller A, not the original one. It's a new instance because you are doing alloc/init.

When you go back, you are going back to the ORIGINAL instance of your view controller A. You have not changed its options value.

Property Update not being saved from other view controller

1 Answers1