title: UILabel [__NSCFString set]: unrecognized selector sent to instance crash
body: <p>I am having a weird crash related to a UILabel but the crash reporting service I am using doesn't give me much help to locate it. I can't know which Controller and which UILabel is causing it. The only help I have is the following:</p>
  
  <pre><code>-[__NSCFString set]: unrecognized selector sent to instance 0x1e0958d0
  0    CoreFoundation     __exceptionPreprocess + 162
  1    libobjc.A.dylib    objc_exception_throw + 30
  2    CoreFoundation     -[NSObject(NSObject) doesNotRecognizeSelector:] + 170
  3    CoreFoundation     ___forwarding___ + 392
  4    CoreFoundation     _CF_forwarding_prep_0 + 24
  5    UIKit              -[UILabel _legacy_drawTextInRect:baselineCalculationOnly:] + 2632
  6    UIKit              -[UILabel _drawTextInRect:baselineCalculationOnly:] + 166
  7    UIKit              -[UILabel drawTextInRect:] + 450
  8    UIKit              -[UILabel drawRect:] + 72
  9    UIKit              -[UIView(CALayerDelegate) drawLayer:inContext:] + 364
  10   QuartzCore         -[CALayer drawInContext:] + 112
  11   QuartzCore         CABackingStoreUpdate_ + 1808
  12   QuartzCore         CA::Layer::display_() + 980
  13   QuartzCore         CA::Layer::display_if_needed(CA::Transaction*) + 202
  14   QuartzCore         CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 24
  15   QuartzCore         CA::Context::commit_transaction(CA::Transaction*) + 238
  16   QuartzCore         CA::Transaction::commit() + 316
  17   QuartzCore         CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 60
  18   CoreFoundation     __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 20
  19   CoreFoundation     __CFRunLoopDoObservers + 276
  20   CoreFoundation     __CFRunLoopRun + 742
  21   CoreFoundation     CFRunLoopRunSpecific + 356
  22   CoreFoundation     CFRunLoopRunInMode + 104
  23   GraphicsServices   GSEventRunModal + 74
  24   UIKit              UIApplicationMain + 1120
  25   App                main.m line 14
  26   App                start + 40
  </code></pre>
  
  <p>Is there anything I can find my way through this? Thanx in advance!</p>