Does code in finally get run after a return in Objective-C?

Question

Consider the following code:

@try {
  if (something.notvalid)
  {
    return;
  }
  // do something else
} @catch (NSException *ex) {
  // handle exception
}         


        

Answer 1

Yes. Even if there was an Exception within catch block, finally will be executed.

If you are familiar with C++, just think finally as the destructor of an object. What ever the state of a statement within the object, ~Destructor will be executed. But you cant put return within finally[some compilers allow though].

See the code below: See how global variable y been changed. Also see how Exception1 been covered by Exception2.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace finallyTest
{
    class Program
    {
        static int y = 0;
        static int testFinally()
        {
            int x = 0;
            try
            {
                x = 1;
                throw new Exception("Exception1");
                x = 2;
                return x;
            }
            catch (Exception e)
            {
                x = -1;
                throw new Exception("Exception2", e);
            }
            finally
            {
                x = 3;
                y = 1;
            }
            return x;
        }

        static void Main(string[] args)
        {
            try
            {
                Console.WriteLine(">>>>>" + testFinally());
            }
            catch (Exception e)
            { Console.WriteLine(">>>>>" + e.ToString()); }
            Console.WriteLine(">>>>>" + y);
            Console.ReadLine();
        }
    }
}

output:

    >>>>>System.Exception: Exception2 ---> System.Exception: Exception1
   at finallyTest.Program.testFinally() in \Projects\finallyTest\finallyTest\Program.cs:line 17
   --- End of inner exception stack trace ---
   at finallyTest.Program.testFinally() in \Projects\finallyTest\finallyTest\Program.cs:line 24
   at finallyTest.Program.Main(String[] args) in \Projects\finallyTest\finallyTest\Program.cs:line 38
>>>>>1