title: get value in NSDictionary
body: <p>I want to get value from <code>NSDictionary</code>. I want to control "Code" key according to Code key, I will get datum values. I get error message When I try different methods. </p>
  
  <p>ERROR MESSAGE  </p>
  
  <blockquote>
    <p>2011-08-11 12:45:21.549 AOK[6312:207] -[__NSArrayM
    getObjects:andKeys:]: unrecognized selector sent to instance 0x5e138b0
    2011-08-11 12:45:21.550 AOK[6312:207] <strong>* Terminating app due to
    uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayM
    getObjects:andKeys:]: unrecognized selector sent to instance
    0x5e138b0'
    *</strong> Call stack at first throw:</p>
  </blockquote>
  
  <p>NSDictionary</p>
  
  <pre><code>(
          {
          Omschrijving = "ADDD";
          Ophaaldata =         {
              Datum =             (
                  "2011-07-04",
                  "2011-07-11",
                  "2011-07-18",
                  "2011-07-25"
              );
          };
      },
          {
          Omschrijving = "BBBB";
          Ophaaldata =         {
              Datum =             (
                  "2011-07-05",
                  "2011-07-12",
                  "2011-07-19",
                  "2011-07-26"
              );
          };
      },
          {
          Omschrijving = "KKKK";
          Ophaaldata =         {
              Datum =             (
                  "2011-07-07",
                  "2011-07-14",
                  "2011-07-21",
                  "2011-07-28"
              );
          };
      },
          {
          Omschrijving = "LLLLL";
          Ophaaldata =         {
              Datum =             (
                  "2011-07-01",
                  "2011-07-08",
                  "2011-07-15",
                  "2011-07-22",
                  "2011-07-29"
              );
          };
      },
          {
          Omschrijving = "MMMMM";
          Ophaaldata =         {
              Datum =             (
                  "2011-07-01",
                  "2011-07-15",
                  "2011-07-29"
              );
          };
      },
          {
          Code = POP;
          Omschrijving = "FFFF";
          Ophaaldata =         {
              Datum = "2011-07-12";
          };
      },
          {
          Code = 00;
          Omschrijving = "SSSS";
          Ophaaldata =         {
              Datum =             (
                  "2011-07-14",
                  "2011-07-27"
              );
          };
      },
          {
          Code = 01;
          Omschrijving = "CCCCC";
          Ophaaldata =         {
              Datum =             (
                  "2011-07-06",
                  "2011-07-20"
              );
          };
      }
  )
  </code></pre>