iOS之视图切换

//基类：通过该类创建自定义导航控制器
#import "CXDNavigationController.h"
#import "UIColor+Extension.h"//设置颜色的工具类

@interface CXDNavigationController ()

@end

@implementation CXDNavigationController

- (void)viewDidLoad {
    [super viewDidLoad];


    //动态更改导航背景/样式
    UINavigationBar *bar = [UINavigationBar appearance];
    [bar setBarTintColor:[UIColor colorWithHexString:@"#303030"]];
    [bar setTintColor:[UIColor whiteColor]];
    [bar setTitleTextAttributes:@{
                                 NSForegroundColorAttributeName : [UIColor whiteColor],
                                 NSFontAttributeName : [UIFont boldSystemFontOfSize:20],
                                 }];
    //导航条中按钮样式
    UIBarButtonItem *item = [UIBarButtonItem appearance];
    [item setTitleTextAttributes:@{
                                  NSForegroundColorAttributeName : [UIColor whiteColor],
                                  NSFontAttributeName : [UIFont boldSystemFontOfSize:20],
                                  } forState:UIControlStateNormal];
    
}

//更改状态栏颜色(有信号，时间，电池等一栏)
- (UIStatusBarStyle)preferredStatusBarStyle
{
    return UIStatusBarStyleLightContent;
}



//确定状态栏是否隐藏
-(BOOL)prefersStatusBarHidden
{
    return NO;
}

//调度：通过该类切换到对应视图控制器
//亮点：通过单例模式创建视图，减小内存消耗
//用户通过在侧滑菜单点击对应视图进行视图切换

#import "AllControllerDispatchTool.h"
#import "GoodProductsViewController.h"
#import "ReadingViewController.h"
#import "SettingViewController.h"
#import "CXDNavigationController.h"

@implementation AllControllerDispatchTool

#pragma mark - 调度方法
+ (void)createViewControllerWithIndex:(NSUInteger)index
{
    //获取当前类（唯一）对象
    AllControllerDispatchTool *dispatchTool = [AllControllerDispatchTool shareOpenController];
    
    //用当前类对象 执行实际选择执行方法
    [dispatchTool openViewControllerWithIndex:index];
}

+ (instancetype)shareOpenController
{
    //获取到调度的唯一对象
    static AllControllerDispatchTool *tempTool = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        tempTool = [[AllControllerDispatchTool alloc] init];
    });
    return tempTool;
}


#pragma mark - 实际选择执行方法
- (void)openViewControllerWithIndex:(NSUInteger)index
{
    switch (index) {
        case 0:{
            //第一次加载，加载[良品]界面
            static CXDNavigationController *navVC = nil;
            static dispatch_once_t onceToken;
            dispatch_once(&onceToken, ^{
                GoodProductsViewController *goodVC = [[GoodProductsViewController alloc] init];
                navVC = [[CXDNavigationController alloc] initWithRootViewController:goodVC];
            });
            [UIApplication sharedApplication].keyWindow.rootViewController = navVC;
            [[UIApplication sharedApplication].keyWindow makeKeyAndVisible];
        }
            break;
        case 1:{
            //第二次加载，加载[阅读]界面
            static CXDNavigationController *navVC = nil;
            static dispatch_once_t onceToken;
            dispatch_once(&onceToken, ^{
                ReadingViewController *readVC = [[ReadingViewController alloc] init];
                navVC = [[CXDNavigationController alloc] initWithRootViewController:readVC];
            });
            [UIApplication sharedApplication].keyWindow.rootViewController = navVC;
            [[UIApplication sharedApplication].keyWindow makeKeyAndVisible];
        }
            break;
        case 2:{
            //第三次加载，加载[设置]界面
            static CXDNavigationController *navVC = nil;
            static dispatch_once_t onceToken;
            dispatch_once(&onceToken, ^{
                SettingViewController *settVC = [[SettingViewController alloc] init];
                navVC = [[CXDNavigationController alloc] initWithRootViewController:settVC];
            });
            [UIApplication sharedApplication].keyWindow.rootViewController = navVC;
            [[UIApplication sharedApplication].keyWindow makeKeyAndVisible];
        }
            break;
        default:
            break;
    }
    
}

PS：部分代码，仅供参考，欢迎讨论