title: UIScrollView ContentSize crashes my code
body: <p>I have this line of code in my app:</p>
  
  <pre><code>NSLog(@"%f , %f",safeZoneTutorialView.frame.size.height,safeZoneListView.frame.size.height);
  [safeZonesScrollView setContentSize:CGSizeMake(320, safeZoneTutorialView.frame.size.height + 30 + safeZoneListView.frame.size.height)];
  </code></pre>
  
  <p>The output log is:</p>
  
  <pre><code>2012-09-21 09:44:52.148 Locator[22143:11603] 100.000000 , 231.250000
  2012-09-21 09:44:54.176 Locator[22143:11603] -[userProfileSafeZones setContentSize:]:               unrecognized selector sent to instance 0x7bc1290
  2012-09-21 09:44:54.176 Locator[22143:11603] *** Terminating app due to uncaught exception    'NSInvalidArgumentException', reason: '-[userProfileSafeZones setContentSize:]: unrecognized     selector sent to instance 0x7bc1290'
  *** First throw call stack:
  (0x15d2022 0x1056cd6 0x15d3cbd 0x1538ed0 0x1538cb2 0x1bdf7 0x1a8f6 0x15d3e99 0x1bc14e   0x1bc0e6 0x262ade 0x262fa7 0x262266 0x47da1a 0x15a699e 0x153d640 0x15094c6 0x1508d84 0x1508c9b 0x14bb7d8 0x14bb88a 0x1b9626 0x2252 0x21c5)
  terminate called throwing an exception
  </code></pre>
  
  <p>Did I enter the command incorrectly?</p>
  
  <p>This is the rest of this ScrollView data:</p>
  
  <pre><code>NSArray *nibObjects = [[NSBundle mainBundle] loadNibNamed:@"userProfileSafeZones" owner:self options:nil];
  safeZonesScrollView = [nibObjects objectAtIndex:0];
  safeZonesScrollView.frame = CGRectMake(0,145,320,335);
  safeZonesScrollView.alpha = 0;
  </code></pre>
  
  <p>And i'm not sure if i should "alloc init" this scrollview (it crashes if i do and it crashes if i don't).</p>
  
  <p>Thanks.</p>