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我正在构建一个应用程序，人们需要能够从 iOS 照片应用程序共享照片。为此，人们需要登录到应用程序。

所以我为共享创建了一个新的 iOS 目标。现在我使用 KeychainItemWrapper 来存储用户凭据。因此，主要目标和 share-sheet 目标都使用 iOS 钥匙串来检索登录信息。

现在，当我从主应用程序注销，然后以其他用户身份登录，然后我启动共享表时，看起来共享表仍然具有前一个用户的旧数据。

这怎么可能？如何确保两个目标始终使用钥匙串中最新和最好的数据？

#import "KeychainManager.h"
#import "KeychainItemWrapper.h"

NSString * const CREDENTIALS_IDENTIFIER = @"credentials";
NSString * const COOKIES_IDENTIFIER = @"cookies";

static KeychainManager *keychainManager;

@implementation KeychainManager

+ (instancetype)sharedCredentailsManager {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        keychainManager = [[KeychainManager alloc] init];
    });
    return keychainManager;
}

#pragma mark - Getter
- (KeychainItemWrapper *)credentialsKeychainItem {
    return [[KeychainItemWrapper alloc] initWithIdentifier:CREDENTIALS_IDENTIFIER accessGroup:nil];
}

- (KeychainItemWrapper *)cookiesKeychainItem {
    return [[KeychainItemWrapper alloc] initWithIdentifier:COOKIES_IDENTIFIER accessGroup:nil];
}

- (NSString *)domainName {
    NSString *domainName = [self.credentialsKeychainItem objectForKey:(__bridge id)(kSecAttrService)];
    return (domainName.length > 0) ? domainName : @"";
}

- (NSString *)userName {
    NSString *userName = [self.credentialsKeychainItem objectForKey:(__bridge id)(kSecAttrAccount)];
    return (userName.length > 0) ? userName : @"";
}

- (NSString *)password {
    NSData *password = [self.credentialsKeychainItem objectForKey:(__bridge id)(kSecValueData)];
    if ([password isKindOfClass:[NSString class]] && password.length > 0) {
        return (NSString *)password;
    } else if ([password isKindOfClass:[NSData class]] && password.length > 0) {
        NSString *passwordString = [[NSString alloc] initWithData:password encoding:NSUTF8StringEncoding];
        return (passwordString.length > 0) ? password : @"";
    } else {
        return @"";
    }
}

- (NSArray *)cookies {
    NSLog(@"Getting cookies");
    NSData *cookieData = [self.cookiesKeychainItem objectForKey:(__bridge id)(kSecAttrAccount)];
    if ([cookieData isKindOfClass:[NSData class]] && cookieData.length > 0) {
        NSArray *array = [NSKeyedUnarchiver unarchiveObjectWithData:cookieData];
        NSLog(@"%lu cookies in keychain", (unsigned long)array.count);
        return array;
    } else {
        NSLog(@"No cookies found in KeyChain");
        return nil;
    }
}

#pragma mark - Setter
- (void)setDomainName:(NSString *)domainName {
    [self.credentialsKeychainItem setObject:domainName forKey:(__bridge id)(kSecAttrService)];
}

- (void)setUserName:(NSString *)userName {
    [self.credentialsKeychainItem setObject:userName forKey:(__bridge id)(kSecAttrAccount)];
}

- (void)setPassword:(NSString *)password {
    [self.credentialsKeychainItem setObject:password forKey:(__bridge id)(kSecValueData)];
}

- (void)setCookies:(NSArray *)cookies {
    NSMutableArray *mutableCookies = [[NSMutableArray alloc] init];
    for (NSHTTPCookie *cookie in cookies) {
        NSLog(@"storing cookie: %@", cookie);
        NSDictionary *cookieProperties = cookie.properties;
        [mutableCookies addObject:cookieProperties];
    }
    NSArray *unmutableCookies = [mutableCookies copy];
    NSData * encodedData = [NSKeyedArchiver archivedDataWithRootObject:unmutableCookies];
    [self.cookiesKeychainItem setObject:encodedData forKey:(__bridge id)(kSecAttrAccount)];
}

# pragma mark - Clear data
- (void)clearAll {
    [self clearCredentials];
    [self clearCookies];
}

- (void)clearCredentials {
    [self.credentialsKeychainItem resetKeychainItem];
}

- (void)clearCookies {
    [self.cookiesKeychainItem resetKeychainItem];
}

@end

因此，症状是获取用户名、密码、域或 cookie 的函数都会在同一应用程序的不同目标之间给出不同的结果。

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1 回答 1

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我发现了问题。我必须在两个目标的权利中设置钥匙串共享。

有关如何设置的指南可在此处找到：

http://evgenii.com/blog/sharing-keychain-in-ios/

然后，您必须将钥匙串项目存储在访问组中。当我尝试这样做时，当我想在钥匙串中存储一些东西时，KeychainItemWrapper 给出了一些断言失败，然后我可以使用以下链接解决： 指定访问组时出现 KeychainItemWrapper 错误

于 2016-11-28T14:51:41.463 回答