Logic error “Undefined or garbage value returned to caller”

Question

What is wrong with the following statements?

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    NSString *title;

    switch (section)
    {
        case 0:
            title = @"Section 1";
            break;
        case 1:
            title = @"Section 2";
            break;
        default:
            break;
    }

    return title;
}

Why do I get the logic error "Undefined or garbage value returned to caller" on analyzing this code?

Answer 1

set NSString * title to nil: NSString * title = nil; if(section is neither 0 nor 1 ) then switch (section) goes through default: and then it return title; which is just pointer pointing to nothing or uninitialized. So assign title string to nil; where you declared it.

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    NSString *title = nil;

    switch (section)
    {
        case 0:
            title = @"Section 1";
            break;
        case 1:
            title = @"Section 2";
            break;
        default:
            break;
    }

    return title;
}

Answer 2

Because when section isn't 1 or 2 , title is uninitialized. You can either initialize it in the first line or in the default case of the switch statement.