Attributes导航标题栏字体颜色跟大小

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//获取全局的tabBarItem ,这样只设置一次

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//设置导航条内容 : 左右按钮 与 中间标题(view)

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//设置导航背景图片

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//自定义返回按钮

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//自定义tabBarItem

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//百思不得姐 自定义导航控制器

#import "XMGNavigationController.h"

@interface XMGNavigationController ()

@end

@implementation XMGNavigationController

+ (void)load
{
    // 获取当前类下的导航条
    UINavigationBar *navBar = [UINavigationBar appearanceWhenContainedIn:self, nil];
    
    // bug:
    // iOS7,iOS8 bug:把短信界面导航条改了,联系人界面会出现黑
    
    // 设置标题字体
    // 设置导航条标题字体 => 拿到导航条去设置
    [UINavigationBar appearance];
    NSMutableDictionary *attr = [NSMutableDictionary dictionary];
    attr[NSFontAttributeName] = [UIFont boldSystemFontOfSize:20];
    
    navBar.titleTextAttributes = attr;
    
    // 设置导航条背景图片
    [navBar setBackgroundImage:[UIImage imageNamed:@"navigationbarBackgroundWhite"] forBarMetrics:UIBarMetricsDefault];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // 滑动功能
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self.interactivePopGestureRecognizer.delegate action:@selector(handleNavigationTransition:)];
    [self.view addGestureRecognizer:pan];
    
    // 控制器手势什么时候触发
    pan.delegate = self;

    // 清空手势代理,恢复滑动返回功能
    self.interactivePopGestureRecognizer.enabled = NO;

}

#pragma mark - UIGestureRecognizerDelegate
// 是否触发手势
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
    // 在根控制器下 不要 触发手势
    return self.childViewControllers.count > 1;
}


- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if (self.childViewControllers.count > 0) { // 非根控制器
        
        viewController.hidesBottomBarWhenPushed = YES;
        
        // 非根控制器才需要设置返回按钮
        // 设置返回按钮
        UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
        [backButton setTitle:@"返回" forState:UIControlStateNormal];
        [backButton setImage:[UIImage imageNamed:@"navigationButtonReturn"] forState:UIControlStateNormal];
        [backButton setImage:[UIImage imageNamed:@"navigationButtonReturnClick"] forState:UIControlStateHighlighted];
        [backButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
        [backButton setTitleColor:[UIColor redColor] forState:UIControlStateHighlighted];
        [backButton addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];
        [backButton sizeToFit];
        
        // 注意:一定要在按钮内容有尺寸的时候,设置才有效果
        backButton.contentEdgeInsets = UIEdgeInsetsMake(0, -25, 0, 0);
        
        // 设置返回按钮
        viewController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
        
    }
    
    // 这个方法才是真正执行跳转
    [super pushViewController:viewController animated:animated];
}

- (void)back
{
    [self popViewControllerAnimated:YES];
}
@end

//百思不得姐 自定义tabbar控制器

#import "XMGTabBarController.h"
#import "XMGEssenceViewController.h"
#import "XMGFriendTrendViewController.h"
#import "XMGMeViewController.h"
#import "XMGPublishViewController.h"
#import "XMGNewViewController.h"
#import "XMGTabBar.h"
#import "XMGNavigationController.h"

#import "UIImage+Render.h"

@interface XMGTabBarController ()

@end

@implementation XMGTabBarController

+ (void)load
{
    // 获取当前类的tabBarItem
    UITabBarItem *item = [UITabBarItem appearanceWhenContainedIn:self, nil];
    
    // 设置所有item的选中时颜色
    // 设置选中文字颜色
    // 创建字典去描述文本
    NSMutableDictionary *attr = [NSMutableDictionary dictionary];
    // 文本颜色 -> 描述富文本属性的key -> NSAttributedString.h
    attr[NSForegroundColorAttributeName] = [UIColor blackColor];
    [item setTitleTextAttributes:attr forState:UIControlStateSelected];

    // 通过normal状态设置字体大小
    // 字体大小 跟 normal
    NSMutableDictionary *attrnor = [NSMutableDictionary dictionary];
   
    // 设置字体
    attrnor[NSFontAttributeName] = [UIFont systemFontOfSize:13];
    
    [item setTitleTextAttributes:attrnor forState:UIControlStateNormal];
}

- (void)viewDidLoad {
    [super viewDidLoad];

    // 添加所有子控制器
    [self setupAllChildViewController];
    
    // 设置tabBar上对应按钮内容 -> 由对应的子控制器的tabBarItem 决定
    [self setupAllTileButton];
    
    // 自定义tabBar
    [self setupTabBar];
}

#pragma mark - 添加所有的子控制器
- (void)setupAllChildViewController
{
    // 精华
    XMGEssenceViewController *essenceVc = [[XMGEssenceViewController alloc] init];
    XMGNavigationController *nav = [[XMGNavigationController alloc] initWithRootViewController:essenceVc];
    [self addChildViewController:nav];
    
    // 新帖
    XMGNewViewController *newVc = [[XMGNewViewController alloc] init];
    XMGNavigationController *nav1 = [[XMGNavigationController alloc] initWithRootViewController:newVc];
    [self addChildViewController:nav1];
    
    // 关注
    XMGFriendTrendViewController *friendTrendVc = [[XMGFriendTrendViewController alloc] init];
    XMGNavigationController *nav3 = [[XMGNavigationController alloc] initWithRootViewController:friendTrendVc];
    [self addChildViewController:nav3];
    
    // 我
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"XMGMeViewController" bundle:nil];
    // 加载箭头指向控制器
    XMGMeViewController *meVc = [storyboard instantiateInitialViewController];
    XMGNavigationController *nav4 = [[XMGNavigationController alloc] initWithRootViewController:meVc];
    [self addChildViewController:nav4];
    
}

#pragma mark - tabbar的代理方法
//- (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item
//{// 这里不需要调用super，因为父类没有实现这个代理方法
//    XMGFunc
//}

#pragma mark - 自定义tabBar
- (void)setupTabBar
{
    XMGTabBar *tabBar = [[XMGTabBar alloc] init];
    
    // 替换系统的tabBar KVC:设置readonly属性
    [self setValue:tabBar forKey:@"tabBar"];
}

/*
 Changing the delegate of 【a tab bar managed by a tab bar controller】 is not allowed.
 被UITabBarController所管理的UITabBar，它的delegate不允许被修改
 */

#pragma mark - 设置所有标题按钮内容
- (void)setupAllTileButton
{
    // 0:精华
    UINavigationController *nav = self.childViewControllers[0];
    // 标题
    nav.tabBarItem.title = @"精华";
    // 图片
    nav.tabBarItem.image = [UIImage imageNamed:@"tabBar_essence_icon"];
    
    // 选中
    nav.tabBarItem.selectedImage = [UIImage imageNameWithOriginal:@"tabBar_essence_click_icon"];
    
    // 1:新帖
    UINavigationController *nav1 = self.childViewControllers[1];
    // 标题
    nav1.tabBarItem.title = @"新帖";
    // 图片
    nav1.tabBarItem.image = [UIImage imageNamed:@"tabBar_new_icon"];
    // 选中
    nav1.tabBarItem.selectedImage = [UIImage imageNameWithOriginal:@"tabBar_new_click_icon"];

    // 3:关注
    UINavigationController *nav3 = self.childViewControllers[2];
    // 标题
    nav3.tabBarItem.title = @"关注";
    // 图片
    nav3.tabBarItem.image = [UIImage imageNamed:@"tabBar_friendTrends_icon"];
    // 选中
    nav3.tabBarItem.selectedImage = [UIImage imageNameWithOriginal:@"tabBar_friendTrends_click_icon"];
    
    // 4:我
    UINavigationController *nav4 = self.childViewControllers[3];
    // 标题
    nav4.tabBarItem.title = @"我";
    // 图片
    nav4.tabBarItem.image = [UIImage imageNamed:@"tabBar_me_icon"];
    // 选中
    nav4.tabBarItem.selectedImage = [UIImage imageNameWithOriginal:@"tabBar_me_click_icon"];
    
}

@end

设置导航栏背景图片为一个空的image，这样就透明了

    //设置导航栏背景图片为一个空的image，这样就透明了
    [self.navigationController.navigationBar setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault];
    
    //去掉透明后导航栏下边的黑边
    [self.navigationController.navigationBar setShadowImage:[[UIImage alloc] init]];

也可以以登录注册为例, 登录时隐藏导航栏, 进入注册界面后显示导航栏, 在登录里self.navigationController.navigationBar.hidden = YES; viewwillappear时显示导航栏, 在注册界面 viewwilldisappear时再把导航栏隐藏, 也能起到作用, 但是会出bug 切换界面时出现一块黑, 把窗口设成当前背景色也可以解决此问题