(007)UIBarButtonItem导航栏按钮

-(id)init
{
    if(self = [super initWithStyle:UITableViewStylePlain])
    {
        self.title = @"主菜单";//顶部信息
        self.navigationItem.prompt = @"导航条信息";//标题
        
        //右边按钮
        UIBarButtonItem *rightItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCompose target:nil action:nil];
        self.navigationItem.rightBarButtonItem = rightItem;
        
        //左边按钮
        UIImage *image = [UIImage imageNamed:@"btn.png"];
        UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
        UIBarButtonItem *leftItem = [[UIBarButtonItem alloc] initWithCustomView:imageView];
        self.navigationItem.leftBarButtonItem = leftItem;
        
        items = [[NSMutableArray alloc] initWithObjects:@"FirstViewController",@"SecondViewController",nil];
    }
    return self;
}