title: IOS 7 App Crash when NSAttributedString + NSString sent to UIActivityViewController and Mail app selected
body: <p>I wanted to confirm that the following functionality is supported: </p>
  
  <p>I have a simple app where I am trying to send an array of strings to UIActivityViewController.  The array contains an attributed string and also a regular string.  When I click on the share button and open the Mail app, I get a crash and error.  However when I only send the attributed string by itself, it works. </p>
  
  <p>I have tried this on IOS6 and it works fine on that.  </p>
  
  <p>Here is the configuration:</p>
  
  <pre><code> NSAttributedString *appName=[[NSAttributedString alloc] initWithString:@"TasteBank\n"     
         attributes:@{NSFontAttributeName : [UIFont boldSystemFontOfSize:[UIFont  
         systemFontSize]],NSForegroundColorAttributeName:[UIColor brownColor]}];
  
  //crash seen when @"test" added to array without that no crash when mail app opened on ios7
  
  NSMutableArray *dataToShare = [[NSMutableArray alloc ] initWithObjects: appName, @"test", nil];
  
  UIActivityViewController* activityViewController =
          [[UIActivityViewController alloc] initWithActivityItems:dataToShare applicationActivities:nil];
  
  [self presentViewController:activityViewController animated:YES completion:^{}];
  </code></pre>
  
  <p>IS there something wrong with this? Is this configuration supported in IOS7?  if so, could this be a bug?</p>
  
  <p>I see the following error when I run on my iPhone 4 with IOS 7:</p>
  
  <pre><code>2013-10-17 11:43:50.609 testing12[2499:60b] -[NSConcreteMutableAttributedString appendString:]:        unrecognized selector sent to instance 0x165ae670
  2013-10-17 11:43:50.612 testing12[2499:60b] Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSConcreteMutableAttributedString appendString:]: unrecognized selector sent to instance 0x165ae670' 
  First throw call stack:
  (0x2ff53f53 0x3a32c6af 0x2ff578e7 0x2ff561d3 0x2fea5598 0x32c389a1 0x328e2f2b 0x328e2bb1 0x328e2791 0x328e23b7 0x328e20dd 0x3284c101 0x3284c101 0x326f9601 0x326f468d 0x326c9a25 0x326c8221 0x2ff1f18b 0x2ff1e65b 0x2ff1ce4f 0x2fe87ce7 0x2fe87acb 0x34ba8283 0x32729a41 0xbd1ed 0x3a834ab7)
  </code></pre>
  
  <p>I see this error when run on IOS7.0 simulator in XCODE 5:</p>
  
  <pre><code>2013-10-17 11:23:42.054 testing12[3258:a0b] -[NSConcreteMutableAttributedString appendString:]: unrecognized selector sent to instance 0xa181470
  2013-10-17 11:23:42.085 testing12[3258:a0b] Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSConcreteMutableAttributedString appendString:]: unrecognized selector sent to instance 0xa181470'
  First throw call stack:
  (0   CoreFoundation                      0x017345e4 exceptionPreprocess + 180 
  1    libobjc.A.dylib                     0x014b78b6 objc_exception_throw + 44
  2   CoreFoundation                      0x017d1903 -[NSObject(NSObject) doesNotRecognizeSelector:] + 275
  3   CoreFoundation                      0x0172490b forwarding___ + 1019
  4   CoreFoundation                      0x017244ee _CF_forwarding_prep_0 + 14
  5   UIKit                               0x008bdfa3 -[UIMailActivity prepareWithActivityItems:] + 2346
  6   UIKit                               0x008b9242 -[UIActivityViewController _executeActivity] + 424
  7   UIKit                               0x008ba824 -[UIActivityViewController _performActivity:] + 1359
  8    libobjc.A.dylib                     0x014c981f -[NSObject performSelector:withObject:] + 70
  9   UIKit                               0x0063c75a -[UIActivityGroupViewController collectionView:didSelectItemAtIndexPath:] + 148
  10  UIKit                               0x0083929b -[UICollectionView _selectItemAtIndexPath:animated:scrollPosition:notifyDelegate:] + 605
  11  UIKit                               0x008516d8 -[UICollectionView _userSelectItemAtIndexPath:] + 189
  12  UIKit                               0x00851895 -[UICollectionView touchesEnded:withEvent:] + 437
  13  libobjc.A.dylib                     0x014c9874 -[NSObject performSelector:withObject:withObject:] + 77
  14  UIKit                               0x00382f92 forwardTouchMethod + 271
  15  UIKit                               0x00383002 -[UIResponder touchesEnded:withEvent:] + 30
  16  libobjc.A.dylib                     0x014c9874 -[NSObject performSelector:withObject:withObject:] + 77
  17  UIKit                               0x00382f92 forwardTouchMethod + 271
  18  UIKit                               0x00383002 -[UIResponder touchesEnded:withEvent:] + 30
  19  UIKit                               0x0059dd7f _UIGestureRecognizerUpdate + 7166
  20  UIKit                               0x00268d4a -[UIWindow _sendGesturesForEvent:] + 1291
  21  UIKit                               0x00269c6a -[UIWindow sendEvent:] + 1030
  22  UIKit                               0x0023da36 -[UIApplication sendEvent:] + 242
  23  UIKit                               0x00227d9f _UIApplicationHandleEventQueue + 11421
  24  CoreFoundation                      0x016bd8af CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
  25  CoreFoundation                      0x016bd23b __CFRunLoopDoSources0 + 235
  26  CoreFoundation                      0x016da30e __CFRunLoopRun + 910
  27  CoreFoundation                      0x016d9b33 CFRunLoopRunSpecific + 467
  28  CoreFoundation                      0x016d994b CFRunLoopRunInMode + 123
  29  GraphicsServices                    0x036859d7 GSEventRunModal + 192
  30  GraphicsServices                    0x036857fe GSEventRun + 104
  31  UIKit                               0x0022a94b UIApplicationMain + 1225
  32  testing12                           0x00002efd main + 141
  33  libdyld.dylib                       0x01d70725 start + 0
  34  ???                                 0x00000001 0x0 + 1
  )
  </code></pre>