ios 自定导航栏 返回按钮dreamsdeng的博客-

 导航控制器 默认 返回键盘默认是  一个箭头 + 上一个控制器名称，系统默认，如下图

  如何自定义左上角控制器返回按钮:

  解决方法: 
A控制器进入detail控制器

 - (IBAction)showDatail:(id)sender {     // 注意： 控制器背景色不要在这里设置     AControllerViewController* aController=[[AControllerViewController alloc] init];     aController.hidesBottomBarWhenPushed=YES;     [self.navigationController pushViewController:aController animated:YES];      } 

Detail控制器:

  #import "AControllerViewController.h"  @interface AControllerViewController ()  @end  @implementation AControllerViewController  - (void)viewDidLoad {     [super viewDidLoad];          self.navigationItem.title=@"详情控制器";          // 左上角       UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];       [backButton setImage:[UIImage imageNamed:@"navigationButtonReturn"] forState:UIControlStateNormal];       [backButton setImage:[UIImage imageNamed:@"navigationButtonReturnClick"] forState:UIControlStateHighlighted];       [backButton setTitle:@"返回" forState:UIControlStateNormal];       [backButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];       [backButton setTitleColor:[UIColor redColor] forState:UIControlStateHighlighted];       [backButton sizeToFit];       // 这句代码放在sizeToFit后面       backButton.contentEdgeInsets = UIEdgeInsetsMake(0, -20, 0, 0);       [backButton addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];       self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton]; }   - (void)back {     [self.navigationController popViewControllerAnimated:YES]; }   @end 

 效果图： 

问题：  需要在每一个控制器中写上面代码，一个项目有很多控制器
  解决方法1： 
  使用继承，BaseViewController 继承 UIViewController, 但是如果是UITableViewController
  无法使用, 要写 2个 继承的 子类 BaseTableViewController
  解决2:
  自定义导航控制器，重写 pushViewController方法 

自定义的时候注意点： 

1. 自定义 leftBarButtonItem 以后, 默认右滑关闭控制器页面功能无效
 解决： 把手势加上即可

2. 不要在控制外面设置 控制器背景颜色， 
比如在 XMGTabBarController 设置  tab控制器颜色，A，B，C，B 到时控制器 都初始化，而不是显示的时候才初始化对应控制器

3. 如果A到 B控制器，B控制器 导航栏透明，那么可以看到A控制器透过 B 控制器，那么设置 导航栏 背景图片 即可
 XMGNavigationController 自定义 NavigationController

  #import "XMGNavigationController.h"  @interface XMGNavigationController () <UIGestureRecognizerDelegate>  @end  @implementation XMGNavigationController  - (void)viewDidLoad {     [super viewDidLoad];     // Do any additional setup after loading the view.     // 1. 自定义 leftBarButtonItem 以后, 默认右滑关闭控制器页面功能无效 解决 把手势加上即可     self.interactivePopGestureRecognizer.delegate = self;     // 3. 如果A到 B控制器，B控制器 导航栏透明，那么可以看到A控制器透过 B 控制器，那么设置 导航栏 背景图片 即可     [self.navigationBar setBackgroundImage:[UIImage imageNamed:@"navigationbarBackgroundWhite"] forBarMetrics:UIBarMetricsDefault]; }  /**  *  重写push方法的目的 : 拦截所有push进来的子控制器  *  *  @param viewController 刚刚push进来的子控制器  */ - (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated {     // 必须判断     /*      TwoController *twoVC= [[TwoController alloc]init];         UINavigationController* twoVCN= [[XMGNavigationController alloc] initWithRootViewController:twoVC];            twoVCN.tabBarItem.title=@"B控制器";            [self addChildViewController:twoVCN];      执行该代码的时候也会执行  pushViewController，导航控制器下的控制器不能带返回      */     if (self.childViewControllers.count > 0) { // 如果viewController不是最早push进来的子控制器         // 左上角         UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];         [backButton setImage:[UIImage imageNamed:@"navigationButtonReturn"] forState:UIControlStateNormal];         [backButton setImage:[UIImage imageNamed:@"navigationButtonReturnClick"] forState:UIControlStateHighlighted];         [backButton setTitle:@"返回" forState:UIControlStateNormal];         [backButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];         [backButton setTitleColor:[UIColor redColor] forState:UIControlStateHighlighted];         [backButton sizeToFit];         // 这句代码放在sizeToFit后面         backButton.contentEdgeInsets = UIEdgeInsetsMake(0, -20, 0, 0);         [backButton addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];         viewController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];                  // 隐藏底部的工具条         viewController.hidesBottomBarWhenPushed = YES;     }          // 所有设置搞定后, 再push控制器     [super pushViewController:viewController animated:animated]; }  //- (UIViewController *)popViewControllerAnimated:(BOOL)animated //{ //    return [super popViewControllerAnimated:NO]; //} // //- (NSArray<UIViewController *> *)popToViewController:(UIViewController *)viewController animated:(BOOL)animated //{ //    return [super popToViewController:viewController animated:NO]; //} // //- (NSArray<UIViewController *> *)popToRootViewControllerAnimated:(BOOL)animated //{ //    return [super popToRootViewControllerAnimated:NO]; //}  - (void)back {     [self popViewControllerAnimated:YES]; }  #pragma mark - <UIGestureRecognizerDelegate> /**  *  手势识别器对象会调用这个代理方法来决定手势是否有效  *  *  @return YES : 手势有效, NO : 手势无效  */ - (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer { //    if (self.childViewControllers.count == 1) { // 导航控制器中只有1个子控制器 //        return NO; //    } //    return YES;          // 手势何时有效 : 当导航控制器的子控制器个数 > 1就有效     return self.childViewControllers.count > 1; } @end 

XMGTabBarController 设置： 

   #import "XMGTabBarController.h" #import "OneController.h" #import "TwoController.h" #import "ThreeController.h" #import "FourController.h" #import "ModelController.h" #import "XMGTabBar.h" #import "XMGNavigationController.h"   @interface XMGTabBarController ()  @end  @implementation XMGTabBarController  - (void)viewDidLoad {     [super viewDidLoad];         // 第一个子控制器       OneController *oneVC= [[OneController alloc]init];       UINavigationController* oneVCN= [[UINavigationController alloc] initWithRootViewController:oneVC];       oneVCN.tabBarItem.title=@"A控制器";              //1. 分别设置       UIImage* image1= [UIImage imageNamed:@"navigationbar_friendsearch"];       UIImage* selelctImage1= [UIImage imageNamed:@"navigationbar_friendsearch_highlighted"];       // 系统会被默认图片渲染绿色，这里改变系统渲染图片的模式       selelctImage1= [selelctImage1                       imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];       oneVCN.tabBarItem.image = image1;       oneVCN.tabBarItem.selectedImage = selelctImage1;        // tabbarItem 设置文字 属性       // 属性到  using the keys found in NSAttributedString.h 中找  UIKit下       //       [oneVCN.tabBarItem setBadgeValue:@"100"];       NSMutableDictionary* normalAttrs= [NSMutableDictionary dictionary];       normalAttrs[NSFontAttributeName]= [UIFont systemFontOfSize:14];       normalAttrs[NSForegroundColorAttributeName]=[UIColor blackColor];   //    [oneVC.tabBarItem setTitleTextAttributes:normalAttrs forState:UIControlStateNormal];                     NSMutableDictionary* selectAttrs= [NSMutableDictionary dictionary];          selectAttrs[NSForegroundColorAttributeName]=[UIColor redColor];          selectAttrs[NSFontAttributeName]= [UIFont systemFontOfSize:14];   //    [oneVC.tabBarItem setTitleTextAttributes:selectAttrs forState:UIControlStateSelected];              //2. 统一设置       //setTitleTextAttributes:(nullable NSDictionary<NSAttributedStringKey,id> *)attributes forState:(UIControlState)state API_AVAILABLE(ios(5.0)) UI_APPEARANCE_SELECTOR;       // 后面 有 UI_APPEARANCE_SELECTOR 可以通过 appear设置       // 取出appear,统一设置，那么这个app中所有的 UITabBarItem 都有这个属性       UITabBarItem* item= [UITabBarItem appearance];       [item setTitleTextAttributes:normalAttrs forState:UIControlStateNormal];       [item setTitleTextAttributes:selectAttrs forState:UIControlStateSelected];      // [self addChildViewController:oneVC];      [self addChildViewController:oneVCN];                     // 第二个子控制器         TwoController *twoVC= [[TwoController alloc]init];      UINavigationController* twoVCN= [[XMGNavigationController alloc] initWithRootViewController:twoVC];         twoVCN.tabBarItem.title=@"B控制器";         [self addChildViewController:twoVCN];              // 中间 按钮,如果自定义   XMGTabBar 那么必须设置中间 控制器了 //      UIViewController* center =[[ UIViewController alloc] init]; //      [self addChildViewController: center];            ThreeController *threeVC= [[ThreeController alloc]init];        UINavigationController* threeVCN= [[XMGNavigationController alloc] initWithRootViewController:threeVC];       threeVCN.tabBarItem.title=@"C控制器";       [self addChildViewController:threeVCN];                   FourController *fourVC= [[FourController alloc]init];       UINavigationController* fourVCN= [[XMGNavigationController alloc] initWithRootViewController:fourVC];       fourVCN.tabBarItem.title=@"D控制器";       [self addChildViewController:fourVCN];             //    [tabBarVc addChildViewController:oneVC];   //    [tabBarVc addChildViewController:twoVC];   //    [tabBarVc addChildViewController:threeVC];              //使用 数组的方式 同一设置   //     tabBarVc.viewControllers=@[oneVC,twoVC,threeVC,fourVC];               // 设置自定义tabbar     // tabbar 是  readonly 不能直接设置，通过kvc 设置    //  self.tabBar= [[XMGTabBar alloc] init];     // kvc设置     [self setValue:[[XMGTabBar alloc] init] forKeyPath:@"tabBar"];       }  - (void)viewWillAppear10:(BOOL)animated {     [super viewWillAppear:animated];          /**** 增加一个发布按钮 ****/ // 这个方法会被调入多次，比如，弹出模态窗口，串口消失的时候，会调用这个方法     // 避免添加多个button     //解决方法： 1.dispatch_once     // 2.  懒加载  定义一个变量 publishButton     static dispatch_once_t onceToken;      dispatch_once(&onceToken, ^{         /**** 增加一个发布按钮 ****/         UIButton *publishButton = [UIButton buttonWithType:UIButtonTypeCustom];         publishButton.backgroundColor = XMGRandomColor;         [publishButton setImage:[UIImage imageNamed:@"tabBar_publish_icon"] forState:UIControlStateNormal];         [publishButton setImage:[UIImage imageNamed:@"tabBar_publish_click_icon"] forState:UIControlStateHighlighted];         publishButton.frame = CGRectMake(0, 0, self.tabBar.frame.size.width / 5, self.tabBar.frame.size.height);         publishButton.center = CGPointMake(self.tabBar.frame.size.width * 0.5, self.tabBar.frame.size.height * 0.5);         [publishButton addTarget:self action:@selector(publishClick) forControlEvents:UIControlEventTouchUpInside];         [self.tabBar addSubview:publishButton];     }); }   -(void)publishClick{     NSLog(@"helll");           ModelController* modelVc= [[ModelController alloc] init];      UINavigationController* nav= [[UINavigationController alloc] initWithRootViewController:modelVc];           [self presentViewController:nav animated:YES completion:^{                }];  }   @end