NSUserDefault是蘋果提供給我們用來儲存使用者的登陸資訊的持久化類。下面用例項看下記錄登陸狀態的過程

HRAccountTool.h：

#import <Foundation/Foundation.h>

@interface HRAccountTool : NSObject
/**
 *  儲存賬號資訊
 *  @param account 需要儲存的賬號資訊：第一個值為使用者名稱；第二個值為密碼
 */
+ (void)saveAccount:(NSArray *)account;

/**
 *  返回儲存的賬號資訊
 * @return NSArray
 */
+ (NSArray *)getAccount;

/**
 *  返回儲存的登陸使用者名稱
 *  @return NSString
 */
+ (NSString *)getUserName;

/**
 *  返回儲存的登陸使用者密碼
 *  @return NSString
 */
+ (NSString *)getPassword;
@end
 

HRAccountTool.m：

<pre name="code" class="objc">#import "HRAccountTool.h"

@implementation HRAccountTool

+ (void)saveAccount:(NSArray *)account{
    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
    
    //儲存資料 使用者資訊；使用者名稱；使用者密碼
    [userDefaults setObject:account  forKey:@"account" ];
    [userDefaults setObject:[account objectAtIndex:0]  forKey:@"userName" ];
    [userDefaults setObject:[account objectAtIndex:1]  forKey:@"passWord" ];
};


+ (NSArray *)getAccount{
     NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
     NSArray *array = [userDefaults objectForKey:@"account"];
    return array;
};

+ (NSString *)getUserName{
     NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
     NSString *userName = [userDefaults objectForKey:@"userName"];
    return userName;
};

+ (NSString *)getPassword{
    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
    NSString *passWord = [userDefaults objectForKey:@"passWord"];
    return passWord;
}
@end
 

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.window.backgroundColor = [UIColor whiteColor];
    // 先判斷有無儲存賬號資訊
    if ([HRAccountTool getUserName] == nil) { // 之前沒有登入成功
        self.window.rootViewController = [[HRLoginViewController alloc] init];
    } else {// 之前登入成功
//        self.window.rootViewController = [[IWOAuthViewController alloc] init];
    }

    [self.window makeKeyAndVisible];
    return YES;
}
 

- (void) loginCheck{
    // 1.建立請求管理物件
    AFHTTPRequestOperationManager *mgr = [AFHTTPRequestOperationManager manager];
    // 說明伺服器返回的JSON資料
    mgr.responseSerializer = [AFJSONResponseSerializer serializer];
    // 2.封裝請求引數
    NSMutableDictionary *params = [NSMutableDictionary dictionary];
    params[@"userName"] = userNameTF.text;
    params[@"passWord"] = passWordTF.text;
    
    // 3.傳送請求
    [mgr GET:@"http://localhost:8080/login/check.do" parameters:params
     success:^(AFHTTPRequestOperation *operation, NSDictionary *responseObject) {
        if ([[responseObject objectForKey:@"success"] boolValue] == true) {
             self.view.window.rootViewController = [[ZYTabBarViewController alloc]init];
             NSArray *array  = [NSArray  arrayWithObjects:userNameTF.text, passWordTF.text, nil ];
             
             [HRAccountTool saveAccount:array];
            }else{
             self.view.window.rootViewController = [[ZYloginViewController alloc]init];
         }
         
     } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        HRLog(@"請求失敗:%@", error);

     }];
    
}