ios - Storyboard登录屏幕的最佳实践,处理注销时清除数据




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我正在使用Storyboard构建iOS应用程序。 根视图控制器是一个选项卡栏控制器。 我正在创建登录/注销过程,它大部分工作正常,但我遇到了一些问题。 我需要知道设置所有这些的最佳方式。

我想完成以下内容:

  1. 第一次启动应用程序时显示登录屏幕。 当他们登录时,转到选项卡栏控制器的第一个选项卡。
  2. 之后,他们随时启动应用程序,检查它们是否已登录,并直接跳到根标签栏控制器的第一个选项卡。
  3. 当他们手动点击注销按钮时,显示登录屏幕,并清除视图控制器中的所有数据。

到目前为止,我所做的是将根视图控制器设置为Tab Bar Controller,并为我的Login视图控制器创建了一个自定义的Segue。 在我的Tab Bar Controller类中,我检查它们是否在viewDidAppear方法内部登录,并执行segue: [self performSegueWithIdentifier:@"pushLogin" sender:self];

我还为需要执行注销操作的时间设置通知: [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(logoutAccount) name:@"logoutAccount" object:nil];

注销后,我清除钥匙串中的证书,运行[self setSelectedIndex:0]并执行segue以再次显示登录视图控制器。

这一切都很好,但我想知道: 这个逻辑应该在AppDelegate中吗? 我也有两个问题:

  • 他们第一次启动应用程序时 ,选项卡栏控制器会在执行segue之前短暂显示。 我试着将代码移动到viewWillAppear但是Segue不会那么早。
  • 当他们注销时,所有的数据仍然在所有视图控制器中。 如果他们登录到新帐户,则旧帐户数据仍会显示,直到他们刷新。 我需要一种方法在注销时轻松清除。

我愿意对此进行修改。 我曾考虑让登录屏幕成为根视图控制器,或者在AppDelegate中创建一个导航控制器来处理所有事情......我只是不确定此时最好的方法是什么。


在这里输入图像描述

在App Delegate.m中

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60)
                                                     forBarMetrics:UIBarMetricsDefault];

NSString *identifier;
BOOL isSaved = [[NSUserDefaults standardUserDefaults] boolForKey:@"loginSaved"];
if (isSaved)
{
    //[email protected]"homeViewControllerId";
    UIWindow* mainWindow=[[[UIApplication sharedApplication] delegate] window];
    UITabBarController *tabBarVC =
    [[UIStoryboard storyboardWithName:@"Main" bundle:nil] instantiateViewControllerWithIdentifier:@"TabBarVC"];
    mainWindow.rootViewController=tabBarVC;
}
else
{


    [email protected]"loginViewControllerId";
    UIStoryboard *    storyboardobj=[UIStoryboard storyboardWithName:@"Main" bundle:nil];
    UIViewController *screen = [storyboardobj instantiateViewControllerWithIdentifier:identifier];

    UINavigationController *navigationController=[[UINavigationController alloc] initWithRootViewController:screen];

    self.window.rootViewController = navigationController;
    [self.window makeKeyAndVisible];

}

return YES;

}

查看controller.m 在视图中加载

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.

UIBarButtonItem* barButton = [[UIBarButtonItem alloc] initWithTitle:@"Logout" style:UIBarButtonItemStyleDone target:self action:@selector(logoutButtonClicked:)];
[self.navigationItem setLeftBarButtonItem:barButton];

}

在注销按钮操作中

-(void)logoutButtonClicked:(id)sender{

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Alert" message:@"Do you want to logout?" preferredStyle:UIAlertControllerStyleAlert];

    [alertController addAction:[UIAlertAction actionWithTitle:@"Logout" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
           NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    [defaults setBool:NO forKey:@"loginSaved"];
           [[NSUserDefaults standardUserDefaults] synchronize];
      AppDelegate *appDelegate = [UIApplication sharedApplication].delegate;
    UIStoryboard *    storyboardobj=[UIStoryboard storyboardWithName:@"Main" bundle:nil];
    UIViewController *screen = [storyboardobj instantiateViewControllerWithIdentifier:@"loginViewControllerId"];
    [appDelegate.window setRootViewController:screen];
}]];


[alertController addAction:[UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
    [self dismissViewControllerAnimated:YES completion:nil];
}]];

dispatch_async(dispatch_get_main_queue(), ^ {
    [self presentViewController:alertController animated:YES completion:nil];
});}

编辑:添加注销操作。

1.首先准备应用程序委托文件

AppDelegate.h

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;
@property (nonatomic) BOOL authenticated;

@end

AppDelegate.m

#import "AppDelegate.h"
#import "User.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    User *userObj = [[User alloc] init];
    self.authenticated = [userObj userAuthenticated];

    return YES;
}

2.创建一个名为User的类。

User.h

#import <Foundation/Foundation.h>

@interface User : NSObject

- (void)loginWithUsername:(NSString *)username andPassword:(NSString *)password;
- (void)logout;
- (BOOL)userAuthenticated;

@end

User.m

#import "User.h"

@implementation User

- (void)loginWithUsername:(NSString *)username andPassword:(NSString *)password{

    // Validate user here with your implementation
    // and notify the root controller
    [[NSNotificationCenter defaultCenter] postNotificationName:@"loginActionFinished" object:self userInfo:nil];
}

- (void)logout{
    // Here you can delete the account
}

- (BOOL)userAuthenticated {

    // This variable is only for testing
    // Here you have to implement a mechanism to manipulate this
    BOOL auth = NO;

    if (auth) {
        return YES;
    }

    return NO;
}

3.创建一个新的控制器RootViewController并与第一个视图连接,其中登录按钮处于活动状态。 添加一个Storyboard ID:“initialView”。

RootViewController.h

#import <UIKit/UIKit.h>
#import "LoginViewController.h"

@protocol LoginViewProtocol <NSObject>

- (void)dismissAndLoginView;

@end

@interface RootViewController : UIViewController

@property (nonatomic, weak) id <LoginViewProtocol> delegate;
@property (nonatomic, retain) LoginViewController *loginView;


@end

RootViewController.m

#import "RootViewController.h"

@interface RootViewController ()

@end

@implementation RootViewController

@synthesize loginView;

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)loginBtnPressed:(id)sender {

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(loginActionFinished:)
                                                 name:@"loginActionFinished"
                                               object:loginView];

}

#pragma mark - Dismissing Delegate Methods

-(void) loginActionFinished:(NSNotification*)notification {

    AppDelegate *authObj = (AppDelegate*)[[UIApplication sharedApplication] delegate];
    authObj.authenticated = YES;

    [self dismissLoginAndShowProfile];
}

- (void)dismissLoginAndShowProfile {
    [self dismissViewControllerAnimated:NO completion:^{
        UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
        UITabBarController *tabView = [storyboard instantiateViewControllerWithIdentifier:@"profileView"];
        [self presentViewController:tabView animated:YES completion:nil];
    }];


}

@end

4.创建一个新的控制器LoginViewController并与登录视图连接。

LoginViewController.h

#import <UIKit/UIKit.h>
#import "User.h"

@interface LoginViewController : UIViewController

LoginViewController.m

#import "LoginViewController.h"
#import "AppDelegate.h"

- (void)viewDidLoad
{
    [super viewDidLoad];
}

- (IBAction)submitBtnPressed:(id)sender {
    User *userObj = [[User alloc] init];

    // Here you can get the data from login form
    // and proceed to authenticate process
    NSString *username = @"username retrieved through login form";
    NSString *password = @"password retrieved through login form";
    [userObj loginWithUsername:username andPassword:password];
}

@end

5.最后添加一个新的控制器ProfileViewController并与tabViewController中的配置文件视图连接。

ProfileViewController.h

#import <UIKit/UIKit.h>

@interface ProfileViewController : UIViewController

@end

ProfileViewController.m

#import "ProfileViewController.h"
#import "RootViewController.h"
#import "AppDelegate.h"
#import "User.h"

@interface ProfileViewController ()

@end

@implementation ProfileViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

}

- (void) viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

    if(![(AppDelegate*)[[UIApplication sharedApplication] delegate] authenticated]) {

        UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];

        RootViewController *initView =  (RootViewController*)[storyboard instantiateViewControllerWithIdentifier:@"initialView"];
        [initView setModalPresentationStyle:UIModalPresentationFullScreen];
        [self presentViewController:initView animated:NO completion:nil];
    } else{
        // proceed with the profile view
    }
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)logoutAction:(id)sender {

   User *userObj = [[User alloc] init];
   [userObj logout];

   AppDelegate *authObj = (AppDelegate*)[[UIApplication sharedApplication] delegate];
   authObj.authenticated = NO;

   UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];

   RootViewController *initView =  (RootViewController*)[storyboard instantiateViewControllerWithIdentifier:@"initialView"];
   [initView setModalPresentationStyle:UIModalPresentationFullScreen];
   [self presentViewController:initView animated:NO completion:nil];

}

@end

LoginExample是一个额外帮助的示例项目。


在Xcode 7中,你可以有多个storyBoard。 如果您可以将登录流程保存在单独的故事板中,将会更好。

这可以通过SELECT VIEWCONTROLLER> Editor> Refactor to Storyboard完成

这里是Swift版本,用于将视图设置为RootViewContoller-

    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
    appDelegate.window!.rootViewController = newRootViewController

    let rootViewController: UIViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("LoginViewController")

感谢bhavya的解决方案。关于迅捷有两个答案,但这些答案并不完整。 我已经在swift中做到了这一点。下面是主要代码。

在AppDelegate.swift中

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.

    // seclect the mainStoryBoard entry by whthere user is login.
    let userDefaults = UserDefaults.standard

    if let isLogin: Bool = userDefaults.value(forKey:Common.isLoginKey) as! Bool? {
        if (!isLogin) {
            self.window?.rootViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "LogIn")
        }
   }else {
        self.window?.rootViewController = mainStoryboard.instantiateViewController(withIdentifier: "LogIn")
   }

    return true
}

在SignUpViewController.swift中

@IBAction func userLogin(_ sender: UIButton) {
    //handle your login work
    UserDefaults.standard.setValue(true, forKey: Common.isLoginKey)
    let delegateTemp = UIApplication.shared.delegate
    delegateTemp?.window!?.rootViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "Main")
}

在logOutAction函数中

@IBAction func logOutAction(_ sender: UIButton) {
    UserDefaults.standard.setValue(false, forKey: Common.isLoginKey)
    UIApplication.shared.delegate?.window!?.rootViewController = UIStoryboard(name: "Main", bundle: nil).instantiateInitialViewController()
}

我与你的情况相同,我发现的用于清理数据的解决方案是删除我的视图控制器依赖绘制其信息的所有CoreData内容。 但我仍然发现这种方法非常糟糕,我认为可以在没有故事板并仅使用代码来管理视图控制器之间的转换的情况下完成更好的方法。

我在Github上发现了这个项目 ,它只通过代码完成所有这些工作,而且它很容易理解。 他们使用类似Facebook的菜单,他们所做的是根据用户是否登录来更改中央视图控制器。 当用户注销时,appDelegate会从CoreData中删除数据,并将主视图控制器重新设置为登录屏幕。


我使用它来检查首次启动:

- (NSInteger) checkForFirstLaunch
{
    NSInteger result = 0; //no first launch

    // Get current version ("Bundle Version") from the default Info.plist file
    NSString *currentVersion = (NSString*)[[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleVersion"];
    NSArray *prevStartupVersions = [[NSUserDefaults standardUserDefaults] arrayForKey:@"prevStartupVersions"];
    if (prevStartupVersions == nil)
    {
        // Starting up for first time with NO pre-existing installs (e.g., fresh
        // install of some version)
        [[NSUserDefaults standardUserDefaults] setObject:[NSArray arrayWithObject:currentVersion] forKey:@"prevStartupVersions"];
        result = 1; //first launch of the app
    } else {
        if (![prevStartupVersions containsObject:currentVersion])
        {
            // Starting up for first time with this version of the app. This
            // means a different version of the app was alread installed once
            // and started.
            NSMutableArray *updatedPrevStartVersions = [NSMutableArray arrayWithArray:prevStartupVersions];
            [updatedPrevStartVersions addObject:currentVersion];
            [[NSUserDefaults standardUserDefaults] setObject:updatedPrevStartVersions forKey:@"prevStartupVersions"];
            result = 2; //first launch of this version of the app
        }
    }

    // Save changes to disk
    [[NSUserDefaults standardUserDefaults] synchronize];

    return result;
}

(如果用户删除了应用程序并重新安装它,它就像第一次启动一样)

在AppDelegate中,我检查第一次启动并创建一个导航控制器,其中包含登录屏幕(登录和注册),我将它放在当前主窗口的顶部:

[self.window makeKeyAndVisible];

if (firstLaunch == 1) {
    UINavigationController *_login = [[UINavigationController alloc] initWithRootViewController:loginController];
    [self.window.rootViewController presentViewController:_login animated:NO completion:nil];
}

由于它位于常规视图控制器之上,因此它独立于应用程序的其余部分,如果您不再需要视图控制器,则可以关闭视图控制器。 而且,如果用户手动按下按钮,也可以用这种方式呈现视图。

顺便说一句:我保存我的用户的登录数据是这样的:

KeychainItemWrapper *keychainItem = [[KeychainItemWrapper alloc] initWithIdentifier:@"com.youridentifier" accessGroup:nil];
[keychainItem setObject:password forKey:(__bridge id)(kSecValueData)];
[keychainItem setObject:email forKey:(__bridge id)(kSecAttrAccount)];

对于注销:我从CoreData切换(太慢),现在使用NSArrays和NSDictionaries来管理我的数据。 注销只是意味着清空这些数组和字典。 另外我确保在viewWillAppear中设置我的数据。

而已。


这是我的Swifty解决方案,适用于任何未来的围观者。

1)创建一个协议来处理登录和注销功能:

protocol LoginFlowHandler {
    func handleLogin(withWindow window: UIWindow?)
    func handleLogout(withWindow window: UIWindow?
}

2)扩展所述协议并在此处提供用于注销的功能:

extension LoginFlowHandler {

    func handleLogin(withWindow window: UIWindow?) {

        if let _ = AppState.shared.currentUserId {
            //User has logged in before, cache and continue
            self.showMainApp(withWindow: window)
        } else {
            //No user information, show login flow
            self.showLogin(withWindow: window)
        }
    }

    func handleLogout(withWindow window: UIWindow?) {

        AppState.shared.signOut()

        showLogin(withWindow: window)
    }

    func showLogin(withWindow window: UIWindow?) {
        window?.subviews.forEach { $0.removeFromSuperview() }
        window?.rootViewController = nil
        window?.rootViewController = R.storyboard.login.instantiateInitialViewController()
        window?.makeKeyAndVisible()
    }

    func showMainApp(withWindow window: UIWindow?) {
        window?.rootViewController = nil
        window?.rootViewController = R.storyboard.mainTabBar.instantiateInitialViewController()
        window?.makeKeyAndVisible()
    }
}

3)然后我可以使我的AppDelegate符合LoginFlowHandler协议,并在启动时调用handleLogin

class AppDelegate: UIResponder, UIApplicationDelegate, LoginFlowHandler {

    var window: UIWindow?


     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

            window = UIWindow.init(frame: UIScreen.main.bounds)

            initialiseServices()

            handleLogin(withWindow: window)

            return true
        }
}

从这里,我的协议扩展将处理逻辑或确定用户是否登录/注销,然后相应地更改窗口rootViewController!


在您的didFinishLaunchingWithOptions中的appDelegate.m中

//authenticatedUser: check from NSUserDefaults User credential if its present then set your navigation flow accordingly

if (authenticatedUser) 
{
    self.window.rootViewController = [[UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]] instantiateInitialViewController];        
}
else
{
    UIViewController* rootController = [[UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]] instantiateViewControllerWithIdentifier:@"LoginViewController"];
    UINavigationController* navigation = [[UINavigationController alloc] initWithRootViewController:rootController];

    self.window.rootViewController = navigation;
}

在SignUpViewController.m文件中

- (IBAction)actionSignup:(id)sender
{
    AppDelegate *appDelegateTemp = [[UIApplication sharedApplication]delegate];

    appDelegateTemp.window.rootViewController = [[UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]] instantiateInitialViewController];
}

在文件MyTabThreeViewController.m中

- (IBAction)actionLogout:(id)sender {

    // Delete User credential from NSUserDefaults and other data related to user

    AppDelegate *appDelegateTemp = [[UIApplication sharedApplication]delegate];

    UIViewController* rootController = [[UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]] instantiateViewControllerWithIdentifier:@"LoginViewController"];

    UINavigationController* navigation = [[UINavigationController alloc] initWithRootViewController:rootController];
    appDelegateTemp.window.rootViewController = navigation;

}

Swift 4版本

假设您的初始视图控制器是已签名的TabbarController,则应用程序委托中的didFinishLaunchingWithOptions。

if Auth.auth().currentUser == nil {
        let rootController = UIStoryboard(name: "Main", bundle: Bundle.main).instantiateViewController(withIdentifier: "WelcomeNavigation")
        self.window?.rootViewController = rootController
    }

    return true

在注册视图控制器中:

@IBAction func actionSignup(_ sender: Any) {
let appDelegateTemp = UIApplication.shared.delegate as? AppDelegate
appDelegateTemp?.window?.rootViewController = UIStoryboard(name: "Main", bundle: Bundle.main).instantiateInitialViewController()
}

MyTabThreeViewController

 //Remove user credentials
guard let appDel = UIApplication.shared.delegate as? AppDelegate else { return }
        let rootController = UIStoryboard(name: "Main", bundle: Bundle.main).instantiateViewController(withIdentifier: "WelcomeNavigation")
        appDel.window?.rootViewController = rootController




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