A:样式设置
01:导航栏的背景设置
方式一:可以简单的设置导航栏的背景颜色,设置其backgroudColor;
    [UINavigationBar appearance].backgroundColor = [UIColor redColor];

方式二: 设置barTintColor
    [UINavigationBar appearance].barTintColor = [UIColor redColor];

方式三: 设置背景图片
[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"nav_bg.png"] forBarMetrics:UIBarMetricsDefault];  

02: 导航栏左右按钮的文字颜色设置

方式一: 可以简单设置 tintColor,
缺点: 不能设置不可选状态和高亮状态的颜色

    [UINavigationBar appearance].tintColor = [UIColor redColor];

方式二: 富文本设置
缺点: 不能设置高亮状态的颜色
// 设置不可用状态(disable)的文字属性

    NSMutableDictionary *disableTextAttrs = [NSMutableDictionary dictionary];

    disableTextAttrs[NSForegroundColorAttributeName] = [UIColor blueColor];

    disableTextAttrs[NSFontAttributeName] = [UIFont systemFontOfSize:20];

    [appearance setTitleTextAttributes:disableTextAttrs forState:UIControlStateDisabled];

    // 设置普通状态的文字属性

    NSMutableDictionary *textAttrs = [NSMutableDictionary dictionary];

    textAttrs[NSForegroundColorAttributeName] = [UIColor orangeColor];

    textAttrs[NSFontAttributeName] = [UIFont systemFontOfSize:20];

    [appearance setTitleTextAttributes:textAttrs forState:UIControlStateNormal];

    

    // 设置高亮状态的文字属性

    NSMutableDictionary *highTextAttrs = [NSMutableDictionary dictionary];

    highTextAttrs[NSForegroundColorAttributeName] = [UIColor redColor];

    highTextAttrs[NSFontAttributeName] = [UIFont systemFontOfSize:20];

    [appearance setTitleTextAttributes:highTextAttrs forState:UIControlStateHighlighted];

    

03:导航栏的中间标题的颜色,
 

    UINavigationBar *appearance = [UINavigationBar appearance];

   // 设置文字属性

    NSMutableDictionary *textAttrs = [NSMutableDictionary dictionary];

    textAttrs[NSForegroundColorAttributeName] = [UIColor blackColor];

    textAttrs[NSFontAttributeName] = [UIFont boldSystemFontOfSize:20];

    // UIOffsetZero是结构体, 只要包装成NSValue对象, 才能放进字典\数组中

    textAttrs[UITextAttributeTextShadowOffset] = [NSValue valueWithUIOffset:UIOffsetZero];

    [appearance setTitleTextAttributes:textAttrs];

04: tabBar栏的背景颜色设置
方式一: backgroudColor
    [UITabBar appearance].backgroundColor = [UIColor redColor];

方式二: barTintColor
    [UITabBar appearance].barTintColor = [UIColor redColor];

方式三: backgroundImage
[[UITabBar appearance] setBackgroundImage:[UIImage imageNamed:@"nav_bg.png"] forBarMetrics:UIBarMetricsDefault];  

05: tabbar的文字颜色设置
方式一:tintColor
[UITabBar appearance].tintColor = [UIColor redColor];

方式二: 富文本
    UITabBarItem *appearance = [UITabBarItem appearance];

    

    NSMutableDictionary *normlAtrrs = [NSMutableDictionary dictionary];

    normlAtrrs[NSForegroundColorAttributeName] = [UIColor grayColor];

    

    NSMutableDictionary *selectAtrrs = [NSMutableDictionary dictionary];

    selectAtrrs[NSForegroundColorAttributeName] = [UIColor orangeColor];

    

    [appearance setTitleTextAttributes:normlAtrrs forState:UIControlStateNormal];

    [appearance setTitleTextAttributes:selectAtrrs forState:UIControlStateSelected];

B: 内容的设置
01: 导航栏中间标题的内容
方式一: 直接设置文字
    self.navigationItem.title = @"艹你妹";

方式二: 设置VIew 注意: 按钮也是View,任何View都可以
self.navigationItem.titleView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"appcoda-logo.png"]];  

02: 左右两侧内容设置
方式一: 直接设置文字
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"写私信" style:UIBarButtonItemStylePlain target:self action:@selector(xie)];

方式二: 直接设置View
  self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:[[UISwitch alloc]init]];

方式三: 直接添加图片
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithImage:<#(nullable UIImage *)#> style:<#(UIBarButtonItemStyle)#> target:<#(nullable id)#> 

方式四: 直接添加系统自带样式 注意: 这里一次添加了多个
UIBarButtonItem *shareItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action: nil nil];  

UIBarButtonItem *cameraItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCamera target:self action: nil nil];  

NSArray *itemsArr = @[shareItem,cameraItem];  

self.navigationItem.rightBarButtonItems = itemsArr;  

方式五: 添加一个分类,直接设置默认状态和高亮状态的图片
+ (UIBarButtonItem *)itemWithImageName:(NSString *)imageName helightImageName:(NSString *)helightImageName target:(id)target

                                action:(SEL)action

{

    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];

    

    [btn setImage:[UIImage imageNamed:imageName] forState:UIControlStateNormal];

    [btn setImage:[UIImage imageNamed:helightImageName] forState:UIControlStateHighlighted];

    

    [btn sizeToFit];

    

    [btn addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];

    

    UIBarButtonItem *barBtn = [[UIBarButtonItem alloc] initWithCustomView:btn];

    

    return barBtn;

}

03: 返回按钮的设置
方式一: 重写push方法,统一设置
// 可以拿到所有Push过程

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated

{

    if (self.viewControllers.count > 0) {

        viewController.hidesBottomBarWhenPushed = YES;

        

        // 设置返回按钮

        viewController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"navigationbar_back"] style:UIBarButtonItemStyleDone target:self action:@selector(back)];

        

        

        viewController.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"navigationbar_more"] style:UIBarButtonItemStyleDone target:self action:@selector(more)];

        

        

    }

    

    [super pushViewController:viewController animated:YES]; // 注意其位置

    

    

}

方式二: 父控制器的属性,backBarButtonItem 注意:只写"",会是一个返回箭头
UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithTitle:@"返回" style:UIBarButtonItemStylePlain target:nil action:nil];  

self.navigationItem.backBarButtonItem = item;  

方式三: 自定义
//自定义返回按钮  

UIImage *backButtonImage = [[UIImage imageNamed:@"fanhui.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 30, 0, 0)];  

[[UIBarButtonItem appearance] setBackButtonBackgroundImage:backButtonImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];  

//将返回按钮的文字position设置不在屏幕上显示  

[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(NSIntegerMin, NSIntegerMin) forBarMetrics:UIBarMetricsDefault]