Open app via shared extension

 NSURL *appURL = [NSURL URLWithString:[NSString stringWithFormat:@"%@://", yourAppScheme]];
 
 NSString *className = @"UIApplication";
  if ( NSClassFromString( className ) )
  {
    id object = [ NSClassFromString( className ) performSelector: @selector( sharedApplication ) ];
    [ object performSelector: @selector( openURL: ) withObject:appURL];
  }