单例存储账号

#import "NSString+DocumentPath.h"

@implementation NSString (DocumentPath)

+(NSString *)fileDocumentsPathWith:(NSString *)name{
    NSString *documents = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
    
    NSString *filePath = [documents stringByAppendingPathComponent:name];
    return filePath;
}

#import "AccountInfo.h"
#import "NSString+DocumentPath.h"

#define kAccountFileName @"accountInfo"

@implementation AccountInfo

+(instancetype)currentAccount{
    static AccountInfo *account;
    
    //代码只执行一次
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        
        NSString *filePath = [NSString fileDocumentsPathWith:kAccountFileName];
        account  = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath];
        if (!account) {
            account = [[AccountInfo alloc] init];
        }
    })
    return account;
}

//存储信息，
-(void)saveLoginInfo:(NSDictionary *)info{
    //1.保存 token
    self.accessToken = info[@"access_token"];
    self.uid = info[@"uid"];
    
    //当前时间
    NSDate *date = [NSDate date];
    //生命周期
    NSNumber *expires = info[@"expires_in"];
    //有效的截止时间
    self.expiresIn = [date dateByAddingTimeInterval:expires.floatValue];
    
    //归档登录信息
    [NSKeyedArchiver archiveRootObject:self toFile:[NSString fileDocumentsPathWith:kAccountFileName]];
}

-(BOOL)isLogin{
    //比较有效截止时间跟当前时间
    NSComparisonResult result  = [self.expiresIn compare:[NSDate date]];
    if (self.accessToken && result > 0) {
        return YES;
    }
    return NO;
}

-(BOOL)logout{
    self.accessToken = nil;
    self.uid = nil;
    self.expiresIn = nil;
    
    //删除归档文件
    NSFileManager *manager = [NSFileManager defaultManager];
    
    //文件路径
    NSString *filePath = [NSString fileDocumentsPathWith:kAccountFileName];
    //删除归档的登录信息
    [manager removeItemAtPath:filePath error:nil];
    
    return YES;
}

//返回固定的网络参数
-(NSMutableDictionary *)requetsParams{
    if ([self isLogin]) {
        return [NSMutableDictionary dictionaryWithObject:self.accessToken forKey:@"access_token"];
    }
    return nil;
}

#pragma mark coding 代理

-(id)initWithCoder:(NSCoder *)aDecoder{
    self = [super init];
    if (self) {
        self.accessToken = [aDecoder decodeObjectForKey:@"access_token"];
        self.expiresIn = [aDecoder decodeObjectForKey:@"expires_in"];
        self.uid = [aDecoder decodeObjectForKey:@"uid"];
    }
    return self;
}

- (void)encodeWithCoder:(NSCoder *)coder
{
    //保存对象的属性
    [coder encodeObject:self.accessToken forKey:@"access_token"];
    [coder encodeObject:self.expiresIn forKey:@"expires_in"];
    [coder encodeObject:self.uid forKey:@"uid"];
    
}