display original image on UIBarButtonItem

Image UIBarButtonItem.m

// ios 7 or later
  UIImage *icon = [[UIImage imageNamed:@"icon"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
  UIBarButtonItem *iconItem = [[UIBarButtonItem alloc] initWithImage:icon style:UIBarButtonItemStylePlain target:self action:@selector(iconEvent)];
 
// before ios 6
  UIImage *icon = [UIImage imageNamed:@"icon"];
  UIButton *iconBtn = [UIButton buttonWithType:UIButtonTypeCustom];
  [iconBtn addTarget:self action:@selector(iconEvent) forControlEvents:UIControlEventTouchUpInside];
  iconBtn.bounds = CGRectMake( 0, 0, icon.size.width, icon.size.height );
  [iconBtn setImage:icon forState:UIControlStateNormal];
  UIBarButtonItem *iconItem = [[UIBarButtonItem alloc] initWithCustomView:iconBtn];