导航栏设置

     //设置导航栏颜色方法1 --- 全局
    UINavigationBar *navigationBar = [UINavigationBar appearance];
    [navigationBar setBarTintColor:[UIColor redColor]];

     //设置导航栏颜色方法2 --- 当前控制器
     [self.navigationController.navigationBar setBarTintColor:[UIColor redColor]];

    // 设置导航栏栏的背景图片
    [self.navigationBar setBackgroundImage:[UIImage imageNamed:@"NavBar64"] forBarMetrics:UIBarMetricsDefault];
   
    // 设置导航栏的文字外观
    NSDictionary *dict = @{
                           NSFontAttributeName:[UIFont systemFontOfSize:16],
                           NSForegroundColorAttributeName:[UIColor whiteColor]
                           };
    [self.navigationBar setTitleTextAttributes:dict];

   //设置导航栏上的item外观
    [self.navigationBar setTintColor:[UIColor whiteColor]];

    //导航栏自定义按钮设置
    UIBarButtonItem * rightBtn = [[UIBarButtonItem alloc] initWithTitle:@"账单" style: UIBarButtonItemStylePlain target:self action:@selector(menuBtnAction)];
    [rightBtn setTintColor:[UIColor blackColor]];//设置颜色
    self.navigationItem.rightBarButtonItem = rightBtn;


//navigationBar 留空白问题
    self.automaticallyAdjustsScrollViewInsets = NO;//    自动滚动调整，默认为YES
    self.navigationController.navigationBar.translucent = NO;//  Bar的模糊效果，默认为开启
    self.edgesForExtendedLayout = UIRectEdgeNone;//    iOS7及以后的版本支持，self.view.frame.origin.y会下移64像素至navigationBar下方。

自定义导航栏

 
    UINavigationBar *navigationBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 20, [UIScreen mainScreen].bounds.size.width,44)];
    navigationBar.translucent = NO;
    navigationBar.barTintColor = [DWHColorFromRGB(0xf9f9f9) colorWithAlphaComponent:1];
    extern UIImage *navigationShadeImage;
    [navigationBar setShadowImage:navigationShadeImage];
    
    UINavigationItem *navigationItem = [[UINavigationItem alloc] init];
    UIButton *leftBtn = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 30, 30)];
    [leftBtn setImage:[UIImage imageNamed:@"common_back"] forState:UIControlStateNormal];
    __weak typeof(self) weakSelf = self;
    [[leftBtn rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(id x) {
        [weakSelf dismissViewControllerAnimated:YES completion:nil];
    }];
    UIBarButtonItem *leftItem = [[UIBarButtonItem alloc] initWithCustomView:leftBtn];
    navigationItem.leftBarButtonItem = leftItem;
    
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 100, 44)];
    label.textAlignment = NSTextAlignmentCenter;
    label.font = [UIFont systemFontOfSize:19];
    label.text = @"粉丝贡献榜";
    label.textColor = DWHColorFromRGB(0x333333);
    navigationItem.titleView = label;
    [navigationBar setItems:[NSArray arrayWithObject:navigationItem]];
    [self.view addSubview:navigationBar];