一：首先查看一下关于UINavigationController的定义

NS_CLASS_AVAILABLE_IOS(2_0) @interface UINavigationController : UIViewController//UINavigationController初始化,自定义NavigationBar,自定义toolbar- (instancetype)initWithNavigationBarClass:(nullable Class)navigationBarClass toolbarClass:(nullable Class)toolbarClass NS_AVAILABLE_IOS(5_0);//UINavigationController初始化,导航控制器的根控制器- (instancetype)initWithRootViewController:(UIViewController *)rootViewController;//压栈：将目标控制器压入栈中- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated; //弹栈：将栈顶控制器从栈中弹出- (nullable UIViewController *)popViewControllerAnimated:(BOOL)animated;//弹栈：弹到指定的目标控制器- (nullable NSArray<__kindof UIViewController *> *)popToViewController:(UIViewController *)viewController animated:(BOOL)animated; //弹栈：弹到根控制器- (nullable NSArray<__kindof UIViewController *> *)popToRootViewControllerAnimated:(BOOL)animated;//导航栈的栈顶视图 只读 就是某个导航栈的栈顶视图，和导航息息相关@property(nullable, nonatomic,readonly,strong) UIViewController *topViewController; //当前显示的控制器 只读 visibleViewController和哪个导航栈没有关系，只是当前显示的控制器，也就是说任意一个导航的visibleViewController所返回的值应该是一样的@property(nullable, nonatomic,readonly,strong) UIViewController *visibleViewController;//栈里的视图控制器数组@property(nonatomic,copy) NSArray<__kindof UIViewController *> *viewControllers;//替换栈中的视图控制器数组- (void)setViewControllers:(NSArray
     
       *)viewControllers animated:(BOOL)animated NS_AVAILABLE_IOS(3_0); //是否隐藏导航栏@property(nonatomic,getter=isNavigationBarHidden) BOOL navigationBarHidden;//设置导航栏隐藏 是否有动画- (void)setNavigationBarHidden:(BOOL)hidden animated:(BOOL)animated; //导航栏@property(nonatomic,readonly) UINavigationBar *navigationBar; //toolbar是否隐藏@property(nonatomic,getter=isToolbarHidden) BOOL toolbarHidden NS_AVAILABLE_IOS(3_0);//toolbar是否隐藏 是否有动画- (void)setToolbarHidden:(BOOL)hidden animated:(BOOL)animated NS_AVAILABLE_IOS(3_0); //toolbar对象@property(null_resettable,nonatomic,readonly) UIToolbar *toolbar NS_AVAILABLE_IOS(3_0); //委托@property(nullable, nonatomic, weak) id
      
        delegate;//边缘侧滑返回手势@property(nullable, nonatomic, readonly) UIGestureRecognizer *interactivePopGestureRecognizer NS_AVAILABLE_IOS(7_0);//展示视图控制器- (void)showViewController:(UIViewController *)vc sender:(nullable id)sender NS_AVAILABLE_IOS(8_0); // Interpreted as pushViewController:animated://输入键盘出现时将导航栏隐藏 IOS8特性@property (nonatomic, readwrite, assign) BOOL hidesBarsWhenKeyboardAppears NS_AVAILABLE_IOS(8_0);//滚动页面时隐藏Bar  IOS8特性@property (nonatomic, readwrite, assign) BOOL hidesBarsOnSwipe NS_AVAILABLE_IOS(8_0);//获取能够隐藏navigationBar的滑动手势 只读@property (nonatomic, readonly, strong) UIPanGestureRecognizer *barHideOnSwipeGestureRecognizer NS_AVAILABLE_IOS(8_0);//当设置为true时，横向方向时隐藏NavigationBar@property (nonatomic, readwrite, assign) BOOL hidesBarsWhenVerticallyCompact NS_AVAILABLE_IOS(8_0);//当设置为true时，如果有没处理的点击手势就会隐藏和现实navigationBar @property (nonatomic, readwrite, assign) BOOL hidesBarsOnTap NS_AVAILABLE_IOS(8_0);//获取能够隐藏navigationBar的点击手势 只读@property (nonatomic, readonly, assign) UITapGestureRecognizer *barHideOnTapGestureRecognizer NS_AVAILABLE_IOS(8_0);@end
      
     

知识点1：UINavigationController  UINavigationBar  UINavigationItem三者的关系

通俗地说就是，UINavigationController是个容器，里面可以装很多UIViewController。装这么多UIViewController让用户怎么控制它们呢，总得有个工具吧。这个工具就是UINavigationBar。一个容器就这么一个bar，相当于控制台吧。但是，管理那么多UIViewController，控制台上得按钮啊、标题啊，都千篇一律是不是看起来太无聊了。为了解决这个问题，UINavigationController为每个UIViewController生成一个UINavigationItem，通过这个UINavigationItem可以改变控制台“上面”得按钮和标题。如果你不自定义UINavigationItem，UINavigationController会使用默认的;

UINavigationController是UIViewController的子类，UINavigationBar是UIView的子类。

UINavigationBar是UINavigationController的一个组成部分，就是上面的那个导航栏。

UINavigationBar又有UINavigationItem组成。

UINavigationItem则有title，按钮，提示文本等组成，就是我们看到的title文字，右上角的按钮。 

navigation item在navigation Bar代表一个viewController，具体一点儿来说就是每一个加到navigationController的viewController都会有一个对应的navigationItem一个导航控制器控制多个视图，NavigationBar上的leftItem,rightItem,title是由当前的视图控制器控制的

二：UINavigationControllerDelegate的定义内容

/** *  将要显示目标控制器 * *  @param navigationController 当前导航控制器 *  @param viewController       目标视图控制器 *  @param animated             动画 */- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated;/** *  目标控制器最终显示 * *  @param navigationController 当前导航控制器 *  @param viewController       目标视图控制器 *  @param animated             动画 */- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated;/** *  横竖屏切换 * *  @param navigationController 当前导航控制器 * *  @return 横竖屏方向 */- (UIInterfaceOrientationMask)navigationControllerSupportedInterfaceOrientations:(UINavigationController *)navigationController NS_AVAILABLE_IOS(7_0) __TVOS_PROHIBITED;/** *  横竖屏切换 * *  @param navigationController 当前导航控制器 * *  @return 横竖屏方向 */- (UIInterfaceOrientation)navigationControllerPreferredInterfaceOrientationForPresentation:(UINavigationController *)navigationController NS_AVAILABLE_IOS(7_0) __TVOS_PROHIBITED;/** *  转场动画 * *  @param navigationController 当前导航控制器 *  @param animationController  动画控制器 * *  @return 转场动画 */- (nullable id 
     
      )navigationController:(UINavigationController *)navigationController                                   interactionControllerForAnimationController:(id 
      
       ) animationController NS_AVAILABLE_IOS(7_0);/** *  转场动画 * *  @param navigationController 当前导航控制器 *  @param operation            动画类型枚举 *  @param fromVC               起始视图控制器 *  @param toVC                 目标视图控制器 * *  @return 转场动画 */- (nullable id 
       
        )navigationController:(UINavigationController *)navigationController                                            animationControllerForOperation:(UINavigationControllerOperation)operation                                                         fromViewController:(UIViewController *)fromVC                                                           toViewController:(UIViewController *)toVC  NS_AVAILABLE_IOS(7_0);
       
      
     

UINavigationController的delegate方法我平时的开发工作中很少用到

三：UIViewController (UINavigationControllerItem)分类

@interface UIViewController (UINavigationControllerItem)//导航栏上面用户自定义视图@property(nonatomic,readonly,strong) UINavigationItem *navigationItem; //推送时隐藏bottom@property(nonatomic) BOOL hidesBottomBarWhenPushed;//下级视图的导航控制器@property(nullable, nonatomic,readonly,strong) UINavigationController *navigationController; @end

知识点1：UINavigationControllerItem因为扩展在UIViewController上，所以可以直接在UIViewController中使用下面的代码进行调用跟设置；

self.navigationItem.title = @"UINavigationBar使用总结";

四：UIViewController (UINavigationControllerContextualToolbarItems)分类 拓展toolbarItems属性

@interface UIViewController (UINavigationControllerContextualToolbarItems)//属性设置工具条中包含的按钮@property (nullable, nonatomic, strong) NSArray<__kindof UIBarButtonItem *> *toolbarItems NS_AVAILABLE_IOS(3_0);- (void)setToolbarItems:(nullable NSArray
     
       *)toolbarItems animated:(BOOL)animated NS_AVAILABLE_IOS(3_0);@end
     

五：关于UINavigationBar定义内容

NS_CLASS_AVAILABLE_IOS(2_0) @interface UINavigationBar : UIView 
     
       @property(nonatomic,assign) UIBarStyle barStyle;@property(nullable,nonatomic,weak) id
      
        delegate;//Translucent设置成透明度,设置成YES会有一种模糊效果@property(nonatomic,assign,getter=isTranslucent) BOOL translucent NS_AVAILABLE_IOS(3_0) UI_APPEARANCE_SELECTOR; //UINavigationBar上面不只是简单的显示标题，它也将标题进行了堆栈的管理，每一个标题抽象为的对象在iOS系统中是UINavigationItem对象，我们可以通过push与pop操作管理item组。//向栈中添加一个item，上一个item会被推向导航栏的左侧，变为pop按钮，会有一个动画效果- (void)pushNavigationItem:(UINavigationItem *)item animated:(BOOL)animated;//pop一个item- (nullable UINavigationItem *)popNavigationItemAnimated:(BOOL)animated; //当前push到最上层的item@property(nullable, nonatomic,readonly,strong) UINavigationItem *topItem;//仅次于最上层的item，一般式被推向导航栏左侧的item@property(nullable, nonatomic,readonly,strong) UINavigationItem *backItem;//获取堆栈中所有item的数组@property(nullable,nonatomic,copy) NSArray
       
         *items;//设置一组item- (void)setItems:(nullable NSArray
        
          *)items animated:(BOOL)animated; //系统类型按钮文字颜色@property(null_resettable, nonatomic,strong) UIColor *tintColor;//通过barTintColor来设置背景色@property(nullable, nonatomic,strong) UIColor *barTintColor NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR;  //设置工具栏背景和阴影图案- (void)setBackgroundImage:(nullable UIImage *)backgroundImage forBarPosition:(UIBarPosition)barPosition barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR;- (nullable UIImage *)backgroundImageForBarPosition:(UIBarPosition)barPosition barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR;//通过背景图片来设置导航栏的外观- (void)setBackgroundImage:(nullable UIImage *)backgroundImage forBarMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;- (nullable UIImage *)backgroundImageForBarMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;//背景阴影图片 - 即分割线@property(nullable, nonatomic,strong) UIImage *shadowImage NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR;//标题的富文本@property(nullable,nonatomic,copy) NSDictionary
         
           *titleTextAttributes NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;//标题垂直偏移- (void)setTitleVerticalPositionAdjustment:(CGFloat)adjustment forBarMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;- (CGFloat)titleVerticalPositionAdjustmentForBarMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;//设置返回按钮的图片@property(nullable,nonatomic,strong) UIImage *backIndicatorImage NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR;@property(nullable,nonatomic,strong) UIImage *backIndicatorTransitionMaskImage NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR;@end
         
        
       
      
     

UINavigationBar是用于实现管理层级关系内容的组件，直接继承自UIView。通常用在UINavgationController类中，用于管理和显示UINavgationController的subViewController , 同时UINavgationBar也可以单独使用，添加至任何的UIView中。UINavigationBar比较重要的属性为，左侧按钮，中间的标题，以及右侧按钮。在平时的应用程序中，我们常常使用到自定义UINavigationBar来完成导航条的设置。

知识点1：导航栏全局属性设置

//全局设置导航栏主题- (void)setNavigationControllerAppearance {    [UINavigationBar appearance].barStyle  = UIBarStyleBlack;    [[UINavigationBar appearance] setBarTintColor:[UIColor colorWithWhite:0.1 alpha:0.5]];    [[UINavigationBar appearance] setTintColor:[UIColor whiteColor]];}

全局设置导航栏的好处有两个：一是不用对每个NavigationBar进行设置；二是方便做主题管理，切换主题，只需要更改全局设置即可。

知识点2:自定义返回的图标并去除文字，要同时设置setBackIndicatorImage、setBackIndicatorTransitionMaskImage

[self.navigationController.navigationBar setBackIndicatorImage:[UIImage imageNamed:@"navibar_back_btn_bg_normal.png"]];    [self.navigationController.navigationBar setBackIndicatorTransitionMaskImage:[UIImage imageNamed:@"navibar_back_btn_bg_normal.png"]];     UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStyleBordered target:nil action:nil];  self.navigationItem.backBarButtonItem = backItem;

知识点3：设置导航条底部线条的颜色

颜色转图片的代码：@implementation UIImage (ColorImage)+ (UIImage *)imageWithColor:(UIColor *)color{    CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);    UIGraphicsBeginImageContext(rect.size);    CGContextRef context = UIGraphicsGetCurrentContext();    CGContextSetFillColorWithColor(context, [color CGColor]);    CGContextFillRect(context, rect);    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return image;}@end设置导航栏底部线条颜色的代码：    UINavigationBar *navigationBar = self.navigationController.navigationBar;    [navigationBar setBackgroundImage:[[UIImage alloc] init]                       forBarPosition:UIBarPositionAny                           barMetrics:UIBarMetricsDefault];    //此处使底部线条颜色为红色    [navigationBar setShadowImage:[UIImage imageWithColor:[UIColor redColor]]];

知识点4：隐藏导航条底部线条

//找查到Nav底部的黑线- (UIImageView *)findHairlineImageViewUnder:(UIView *)view{    if ([view isKindOfClass:UIImageView.class] && view.bounds.size.height <= 1.0)    {        return (UIImageView *)view;    }    for (UIView *subview in view.subviews) {        UIImageView *imageView = [self findHairlineImageViewUnder:subview];        if (imageView) {            return imageView;        }    }    return nil;}然后设置这个UIImageView为隐藏就可以了；

方法二：这种主要是隐藏后没办法再显示出来

UINavigationBar *navigationBar = self.navigationController.navigationBar;    //设置透明的背景图，便于识别底部线条有没有被隐藏    [navigationBar setBackgroundImage:[[UIImage alloc] init]                       forBarPosition:UIBarPositionAny                           barMetrics:UIBarMetricsDefault];    //此处使底部线条失效    [navigationBar setShadowImage:[UIImage new]];

六：关于UINavigationItem的定义

NS_CLASS_AVAILABLE_IOS(2_0) @interface UINavigationItem : NSObject 
     
      - (instancetype)initWithTitle:(NSString *)title NS_DESIGNATED_INITIALIZER;- (nullable instancetype)initWithCoder:(NSCoder *)coder NS_DESIGNATED_INITIALIZER;//设置导航栏中间的内容标题@property(nullable, nonatomic,copy)   NSString        *title;         //设置导航栏中间的内容视图    @property(nullable, nonatomic,strong) UIView          *titleView;        @property(nullable,nonatomic,copy)   NSString *prompt;     //返回@property(nullable,nonatomic,strong) UIBarButtonItem *backBarButtonItem; //是否隐藏返回Button@property(nonatomic,assign) BOOL hidesBackButton;- (void)setHidesBackButton:(BOOL)hidesBackButton animated:(BOOL)animated;//左边数组Item@property(nullable,nonatomic,copy) NSArray
      
        *leftBarButtonItems NS_AVAILABLE_IOS(5_0);//右边数组Item@property(nullable,nonatomic,copy) NSArray
       
         *rightBarButtonItems NS_AVAILABLE_IOS(5_0);- (void)setLeftBarButtonItems:(nullable NSArray
        
          *)items animated:(BOOL)animated NS_AVAILABLE_IOS(5_0);- (void)setRightBarButtonItems:(nullable NSArray
         
           *)items animated:(BOOL)animated NS_AVAILABLE_IOS(5_0);//通过指定该属性为YES，可以让leftBarButtonItem和backBarButtonItem同时显示，其中leftBarButtonItem显示在backBarButtonItem的右边 默认值为NO@property(nonatomic) BOOL leftItemsSupplementBackButton NS_AVAILABLE_IOS(5_0);//左边Item@property(nullable, nonatomic,strong) UIBarButtonItem *leftBarButtonItem;//右边Item@property(nullable, nonatomic,strong) UIBarButtonItem *rightBarButtonItem;- (void)setLeftBarButtonItem:(nullable UIBarButtonItem *)item animated:(BOOL)animated;- (void)setRightBarButtonItem:(nullable UIBarButtonItem *)item animated:(BOOL)animated;@end
         
        
       
      
     

UINavigationController会为每一个入栈的UIViewController生成一个UINavigationItem. UIViewController通过修改UINavigationItem可以控制UINavigationBar上的按钮和标题等

知识点1：关于UINavigationItem内容

你可以通过设置self.navigationItem.leftBarButtonItem为某个ButtonItem，self.navigationItem.leftBarButtonItemself.navigationItem.rightBarButtonItemself.navigationItem.backBarButtonItemself.navigationItem.titleView等等注：1、这里的self 指的是UIViewController。2、如果你在新视图中不修改backBarButtonItem 或leftBarButtonItem UINavigationController 会自动添加左边返回按钮用以返回了一个视图。总体的显示原则如下：1）、Left side of the navigationBar 左按钮a）如果当前的viewController设置了leftBarButtonItem，则显示当前VC所自带的leftBarButtonItem。b）如果当前的viewController没有设置leftBarButtonItem，且当前VC不是rootVC的时候，则显示前一层VC的backBarButtonItem。如果前一层的VC没有显示的指定backBarButtonItem的话，系统将会根据前一层VC的title属性自动生成一个back按钮，并显示出来。c）如果当前的viewController没有设置leftBarButtonItem，且当前VC已是rootVC的时候，左边将不显示任何东西。此处注意：5.0中新增加了一个属性leftItemsSupplementBackButton，通过指定该属性为YES，可以让leftBarButtonItem和backBarButtonItem同时显示，其中leftBarButtonItem显示在backBarButtonItem的右边。2)、title 标题a）如果当前VC通过 .navigationItem.titleView指定了自定义的titleView，系统将会显示指定的titleView，此处要注意自定义titleView的高度不要超过navigationBar的高度，否则会显示出界。b）如果当前VC没有指定titleView，系统则会根据当前VC的title或者当前VC的navigationItem.title的内容创建一个UILabel并显示，其中如果指定了navigationItem.title的话，则优先显示navigationItem.title的内容。3)、Right side of the navigationBar  右按钮a）如果当前VC指定了rightBarButtonItem的话，则显示指定的内容。b）如果当前VC没有指定rightBarButtonItem的话，则不显示任何东西。

知识点2：相关属性运用

NavigationBar设置中间的标题或者自定义View[self.navigationItem setTitle:@"旅行"];[self.navigationItem setTitleView:[UIImage imageNamed:@"图片名称"];单个或多个左右Item设置:单个leftItem设置:UIBarButtonItem  *leftBarButton = [[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"BackIcon"] style:UIBarButtonItemStylePlain target:self action:nil]; [leftBarButton setTintColor:[UIColor colorWithWhite:0 alpha:1]]; self.navigationItem.leftBarButtonItem = leftBarButton;多个rightItem设置:UIBarButtonItem *firstItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemReply target:self action:nil];UIBarButtonItem *secondItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemTrash target:self action:nil];NSArray *rightItems = @[firstItem, secondItem];self.navigationItem.rightBarButtonItems = rightItems;

知识点3：设置偏移值

// 返回按钮内容左靠button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;// 让返回按钮内容继续向左边偏移10button.contentEdgeInsets = UIEdgeInsetsMake(0, -10, 0, 0);viewController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:button];

七：UIBarButtonItem定义内容

NS_CLASS_AVAILABLE_IOS(2_0) @interface UIBarButtonItem : UIBarItem 
     
      - (instancetype)init NS_DESIGNATED_INITIALIZER;//初始化- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder NS_DESIGNATED_INITIALIZER;- (instancetype)initWithImage:(nullable UIImage *)image style:(UIBarButtonItemStyle)style target:(nullable id)target action:(nullable SEL)action;- (instancetype)initWithImage:(nullable UIImage *)image landscapeImagePhone:(nullable UIImage *)landscapeImagePhone style:(UIBarButtonItemStyle)style target:(nullable id)target action:(nullable SEL)action NS_AVAILABLE_IOS(5_0); - (instancetype)initWithTitle:(nullable NSString *)title style:(UIBarButtonItemStyle)style target:(nullable id)target action:(nullable SEL)action;- (instancetype)initWithBarButtonSystemItem:(UIBarButtonSystemItem)systemItem target:(nullable id)target action:(nullable SEL)action;//自定义视图- (instancetype)initWithCustomView:(UIView *)customView;//样式@property(nonatomic)         UIBarButtonItemStyle style;            // default is UIBarButtonItemStylePlain@property(nonatomic)         CGFloat              width;           @property(nullable, nonatomic,copy)    NSSet
      
          *possibleTitles;   // default is nil//自定义视图@property(nullable, nonatomic,strong)  __kindof UIView     *customView;       @property(nullable, nonatomic)         SEL                  action;           // default is NULL@property(nullable, nonatomic,weak)    id                   target;           // default is nil- (void)setBackgroundImage:(nullable UIImage *)backgroundImage forState:(UIControlState)state barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;- (nullable UIImage *)backgroundImageForState:(UIControlState)state barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;- (void)setBackgroundImage:(nullable UIImage *)backgroundImage forState:(UIControlState)state style:(UIBarButtonItemStyle)style barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR;- (nullable UIImage *)backgroundImageForState:(UIControlState)state style:(UIBarButtonItemStyle)style barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR;@property(nullable, nonatomic,strong) UIColor *tintColor NS_AVAILABLE_IOS(5_0);- (void)setBackgroundVerticalPositionAdjustment:(CGFloat)adjustment forBarMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (CGFloat)backgroundVerticalPositionAdjustmentForBarMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;- (void)setTitlePositionAdjustment:(UIOffset)adjustment forBarMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; - (UIOffset)titlePositionAdjustmentForBarMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;- (void)setBackButtonBackgroundImage:(nullable UIImage *)backgroundImage forState:(UIControlState)state barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;- (nullable UIImage *)backButtonBackgroundImageForState:(UIControlState)state barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;- (void)setBackButtonTitlePositionAdjustment:(UIOffset)adjustment forBarMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;- (UIOffset)backButtonTitlePositionAdjustmentForBarMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;- (void)setBackButtonBackgroundVerticalPositionAdjustment:(CGFloat)adjustment forBarMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;- (CGFloat)backButtonBackgroundVerticalPositionAdjustmentForBarMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;@end
      
     

知识点1：UIBarButtonSystemItem的样式介绍

typedef NS_ENUM(NSInteger, UIBarButtonSystemItem) {    UIBarButtonSystemItemDone,//显示完成    UIBarButtonSystemItemCancel,//显示取消    UIBarButtonSystemItemEdit,  //显示编辑    UIBarButtonSystemItemSave, //显示保存     UIBarButtonSystemItemAdd,//显示加号    UIBarButtonSystemItemFlexibleSpace,//什么都不显示，占位一个空间位置    UIBarButtonSystemItemFixedSpace,//和上一个类似    UIBarButtonSystemItemCompose,//显示写入按钮    UIBarButtonSystemItemReply,//显示循环按钮    UIBarButtonSystemItemAction,//显示活动按钮    UIBarButtonSystemItemOrganize,//显示组合按钮    UIBarButtonSystemItemBookmarks,//显示图书按钮    UIBarButtonSystemItemSearch,//显示查找按钮    UIBarButtonSystemItemRefresh,//显示刷新按钮    UIBarButtonSystemItemStop,//显示停止按钮    UIBarButtonSystemItemCamera,//显示相机按钮    UIBarButtonSystemItemTrash,//显示移除按钮    UIBarButtonSystemItemPlay,//显示播放按钮    UIBarButtonSystemItemPause,//显示暂停按钮    UIBarButtonSystemItemRewind,//显示退后按钮    UIBarButtonSystemItemFastForward,//显示前进按钮    UIBarButtonSystemItemUndo,//显示消除按钮    UIBarButtonSystemItemRedo ,//显示重做按钮    UIBarButtonSystemItemPageCurl ,//在tool上有效};

例如：self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(right:)];- (void)right:(id)sender{    NSLog(@"rightBarButtonItem");}

知识点2：自定义UIView的UIBarButtonItem

UIView *testView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 40, 60)];self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:testView];

 

 

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