Type Cast with custom object ios

Question

I have an array that may have objects of "Theme" class or "Language" class. Now I am Type Casting my method to Theme class manually. I want to check If array have objects of Theme class then Type cast it with Theme

    cell.textLabel.text = [NSString stringWithFormat:@"%@",[(Theme *)[_listArray objectAtIndex:indexPath.row] name]];

_listArray may also objects of Language Class.

I have done

Class theClass  = [[_listArray firstObject] class];

    cell.textLabel.text = [NSString stringWithFormat:@"%@",[(theClass *)[_listArray objectAtIndex:indexPath.row] name]];

But it is not working...!!! How should I do this?

Thanks.

Sergey Kalinichenko · Accepted Answer · 2014-09-19 16:10:58Z

1

First, it is not necessary to type cast id objects stored in NSArray to a specific type before sending it the message name. This will compile as well:

cell.textLabel.text = [NSString stringWithFormat:@"%@",[[_listArray objectAtIndex:indexPath.row] name]];

However, you would get a run-time problem if the corresponding element does not respond to selector name. Here is how:

NSObject *item = [_listArray objectAtIndex:indexPath.row];
if ([item respondsToSelector:@selector(name)]) {
    cell.textLabel.text = [NSString stringWithFormat:@"%@",[item name]];
}

answered Sep 19, 2014 at 16:10

Sergey Kalinichenko

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