iOS开发 登录退出流程

1.一个账号不能多个设备使用

https://www.jianshu.com/p/a0bdaa0919f1

https://www.jianshu.com/p/9ff7f3ae486d
2.登录

2.1新建一个mode ：存储用户信息

#import <Foundation/Foundation.h>
//从服务器上获取的用户信息
@interface UserInfoModel : NSObject
@property (copy, nonatomic) NSString *mobile;
@property (copy, nonatomic) NSString *agentId;
@property (copy, nonatomic) NSString *userId;
@property (copy, nonatomic) NSString *password;
@property (copy, nonatomic) NSString *passWord;
@property (assign, nonatomic) int userType;
@end

2.2 .m中实现nscode协议 加密用的

#import "UserInfoModel.h"

@implementation UserInfoModel
- (void)encodeWithCoder:(NSCoder *)encoder
{
    [encoder encodeObject:self.mobile forKey:@"mobile"];
    [encoder encodeObject:self.agentId forKey:@"agentId"];
    [encoder encodeObject:self.userId  forKey:@"userId"];
    [encoder encodeInt: self.userType  forKey:@"userType"];
}

-(id)initWithCoder:(NSCoder *)decoder
{
    if(self = [super init])
    {
        self.mobile = [decoder decodeObjectForKey:@"mobile"];
        self.agentId = [decoder decodeObjectForKey:@"agentId"];
        self.userId = [decoder decodeObjectForKey:@"userId"];
        self.userType = [decoder decodeIntForKey:@"userType"];
        
    }
    return  self;
}
@end

2.3 存储和取出用户信息 新建一个类

  //存储
+ (void)saveInfoAboutLoginInfo:(UserInfoModel *)model
{
    NSData *data = [NSKeyedArchiver archivedDataWithRootObject:model];
NSUserDefaults *userDefaults=    [[NSUserDefaults standardUserDefaults] setObject:data forKey:DEFAULTS_USERINFO];
[userDefaults synchronize];
//@需要注意的是，NSUserDefaults是定时把缓存中的数据写入磁盘的，而不是即时写入，为了防止在写完NSUserDefaults后程序退出导致的数据丢失，可以在写入数据后使用synchronize强制立即将数据写入磁盘：
}
//获取
+ (UserInfoModel *)getInfoAboutLoginInfo
{
    NSData *encodedObject = [[NSUserDefaults standardUserDefaults] objectForKey:DEFAULTS_USERINFO];
    id model = [NSKeyedUnarchiver unarchiveObjectWithData:encodedObject];
    if (IsNilOrNull(model))
    {
        return  nil;
    }
    else
    {
        return (UserInfoModel *)model;
    }
}

2.4检测用户是否登录

+ (BOOL)checkInfoAboutIsLogin
{
    if (IsNilOrNull([CommonInfo getInfoAboutLoginInfo]))
    {
        return NO;
    }
    else
    {
        return YES;
    }
}

3.退出登录
@如果想删除某个数据项，可以使用removeObjectForKey删除数据：
[mySetting removeObjectForKey:@"arrItem"];
也可以保存一个空

       [CommonInfo saveUserName:nil passWord:nil];
//还有推送也要处理
//最后跳跳转看需求跳把：跳到跟控制器不用pop
BaseNavViewController *navVC = [[BaseNavViewController alloc] initWithRootViewController:tabbarVC];
               [self.window setRootViewController:navVC];
               [self.window makeKeyAndVisible];

4.登录失败，
5.登录成功，接下来，获取用户信息失败
5.1iOS网络请求重发机制

//这个是写在封装的网络请求的文件下的
- (void)downloadFileRetryingNumberOfTimes:(NSUInteger)ntimes 
                                  success:(void (^)(id responseObject))success 
                                  failure:(void (^)(NSError *error))failure
{
    if (ntimes <= 0) {//区分是不是最后一次重发的结果
//最后一次重发的结果，
 if (success) {
                success(...);
            }
        if (failure) {
            NSError *error = ...;
            failure(error);
        }

    } else {
//不是最后一次重发的结果
        [self getPath:@"/path/to/file" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
            if (success) {
                success(...);
            }
        } failure:^(AFHTTPRequestOperation *operation, NSError *error) {//重发
            [self downloadFileRetryingNumberOfTimes:ntimes - 1 success:success failure:failure];
        }];
    }
}

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