title: Sharekit2.0 share crash in iOS4: NSAssert(vc.presentingViewController == nil, @"vc must not be in the view hierarchy now
body: <p>I have latest Sharekit2.0 included in my project. It's OK on iOS5 and iOS6.However in iOS4, I could not finish  share to twitter because of an issue: "    NSAssert(vc.presentingViewController == nil, @"vc must not be in the view hierarchy now"); //ios4 and older", which is included in SHK.m </p>
  
  <p>I know it's a cause of absence of TWTweetComposeViewController which is used to input share text/picture. However, I still don't know how to implement it and support ios4 ?</p>
  
  <p>I appreciate if somebody could help me on it and better have lines of demo code :). It's better not to change the Sharekit submodule.</p>
  
  <p>Liang</p>