self.title=@"糗事百科";

    UIBarButtonItem *item=[[UIBarButtonItem alloc] initWithTitle:@"返回" style:UIBarButtonItemStyleDone target:self action:nil];

    self.navigationItem.leftBarButtonItem=item;

     UIBarButtonItem *right=[UIBarButtonItem itemWithImageName:@"top_title_button_transpond-normal" highImageName:@"top_title_button_transpond_press" target:self action:@selector(leftbuttonClick:)];

//    

//    UIBarButtonItem *left=[UIBarButtonItem itemWithImageName:@"top_title_button_return_normal" highImageName:@"top_title_button_return_press" target:self action:@selector(leftbuttonClick:)];

//    

//    

//    self.navigationItem.leftBarButtonItem=left;

    self.navigationItem.rightBarButtonItem=right;

//    

//    

//    UIImageView *center=[[UIImageView alloc] init];

//    //

//    

//   UIImage *image=[UIImage imageNamed:@"top_title_button_transpond-normal"];

//    center.image=image;

//    

//    center.frame=CGRectMake(0, 0, image.size.width, image.size.height);

//    

//    self.navigationItem.titleView=center;

//    

//    

//    [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"bar_background"] forBarMetrics:UIBarMetricsDefault];

关于navigation的一些属性设置