Question

i hope you can help me solving my actual problem:

I´ve set up a new project with a navigation controller. For the table view of the project I´ve added a new class for it, called “TableViewController.h” and “TableViewController.m”.

In this class I´ve declared in .h a property for a NSString to access it from other classes, like this:

    @property (strong, nonatomic) NSString *testString;

In .m I´ve synthesized it as followed:

    @synthesize testString;

Now I set in – (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath-Method of the table view controller the following:

    - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
    {
     testString = @"Hello, World!";
    }

Now created a new UIViewController class for the next view which should appear when I´m tapping on a cell (all that works so far). In this UIViewController, called “SecondView” I imported the .h-File of TableViewController.
Further I have this code in SecondView.m:

    -(void) viewDidLoad
    {
     [super viewDidLoad];
     TableViewController *demoObject = [TableViewController alloc] init]
     NSLog (@"Teststring is: %@" [demoObject.testString]);
    }

Now when I start the Simulator I get this Output:
Teststring is: (null)

When I NSLog the testString in TableViewController I get “Hello, World”, but why isn´t it “transferred” to the SecondView class and generates the needed output?

Answer 1

You are logging the string in viewDidLoad, which gets called long before it is set in the table views’s didSelectRow method. You should also use self.testString = ...