你真的了解UINavigationController吗？
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<UIViewController *> *)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<UINavigationControllerDelegate> 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 <UIViewControllerInteractiveTransitioning>)navigationController:(UINavigationController *)navigationController interactionControllerForAnimationController:(id <UIViewControllerAnimatedTransitioning>) 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 <UIViewControllerAnimatedTransitioning>)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<UIBarButtonItem *> *)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 <NSCoding, UIBarPositioning> @property(nonatomic,assign) UIBarStyle barStyle; @property(nullable,nonatomic,weak) id<UINavigationBarDelegate> 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<UINavigationItem *> *items; //设置一组item - (void)setItems:(nullable NSArray<UINavigationItem *> *)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<NSString *,id> *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 <NSCoding> - (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<UIBarButtonItem *> *leftBarButtonItems NS_AVAILABLE_IOS(5_0); //右边数组Item @property(nullable,nonatomic,copy) NSArray<UIBarButtonItem *> *rightBarButtonItems NS_AVAILABLE_IOS(5_0); - (void)setLeftBarButtonItems:(nullable NSArray<UIBarButtonItem *> *)items animated:(BOOL)animated NS_AVAILABLE_IOS(5_0); - (void)setRightBarButtonItems:(nullable NSArray<UIBarButtonItem *> *)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.leftBarButtonItem self.navigationItem.rightBarButtonItem self.navigationItem.backBarButtonItem self.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10 button.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 <NSCoding> - (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<NSString *> *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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