以编程方式访问应用程序标识符前缀

Question

如何以编程方式访问Bundle Seed ID/Team ID/App Identifier Prefix字符串？(就我所知,这些都是一样的).

我正在使用UICKeychainStore keychain包装器来跨多个应用程序保存数据.这些应用程序中的每一个都在其权利清单中具有共享密钥链访问组,并共享相同的配置文件.默认情况下,钥匙串服务使用plist中的第一个访问组作为保存数据的访问组.当我调试UICKeychainStore时,这看起来像"AS234SDG.com.myCompany.SpecificApp".我想将访问组设置为"AS234SDG.com.myCompany.SharedStuff",但我似乎无法找到如何以编程方式获取访问组的"AS234SDG"字符串,并希望避免对其进行硬编码如果可能的话.

Answer 1

Info.plist可以拥有您自己的信息,如果您使用$(AppIdentifierPrefix),则会将其替换为构建阶段的实际应用程序标识符前缀.

所以,试试这个:

在Info.plist中,添加有关应用程序标识符前缀的信息.

<key>AppIdentifierPrefix</key>
<string>$(AppIdentifierPrefix)</string>

然后,您可以使用Objective-C以编程方式检索它:

NSString *appIdentifierPrefix =
    [[NSBundle mainBundle] objectForInfoDictionaryKey:@"AppIdentifierPrefix"];

和Swift一起:

let appIdentifierPrefix =
    Bundle.main.infoDictionary!["AppIdentifierPrefix"] as! String

注意,appIdentifierPrefix以句点结束; 例如AS234SDG.

Answer 2

您可以通过查看kSecAttrAccessGroup现有KeyChain项的访问组属性(即)以编程方式检索Bundle Seed ID .在下面的代码中,我查找现有的KeyChain条目,如果它不存在则创建一个.一旦我有KeyChain条目,我从中提取访问组信息并返回访问组的第一个组件,以"."分隔.(期间)作为捆绑种子ID.

+ (NSString *)bundleSeedID {
    NSDictionary *query = [NSDictionary dictionaryWithObjectsAndKeys:
                           (__bridge NSString *)kSecClassGenericPassword, (__bridge NSString *)kSecClass,
                           @"bundleSeedID", kSecAttrAccount,
                           @"", kSecAttrService,
                           (id)kCFBooleanTrue, kSecReturnAttributes,
                           nil];
    CFDictionaryRef result = nil;
    OSStatus status = SecItemCopyMatching((__bridge CFDictionaryRef)query, (CFTypeRef *)&result);
    if (status == errSecItemNotFound)
        status = SecItemAdd((__bridge CFDictionaryRef)query, (CFTypeRef *)&result);
    if (status != errSecSuccess)
        return nil;
    NSString *accessGroup = [(__bridge NSDictionary *)result objectForKey:(__bridge NSString *)kSecAttrAccessGroup];
    NSArray *components = [accessGroup componentsSeparatedByString:@"."];
    NSString *bundleSeedID = [[components objectEnumerator] nextObject];
    CFRelease(result);
    return bundleSeedID;
}

Answer 3

在swift3中:(基于@Hiron解决方案)

只需一行:

var appIdentifierPrefix = Bundle.main.infoDictionary!["AppIdentifierPrefix"] as! String

鉴于在Info.plist中,添加以下键值属性:

key:AppIdentifierPrefix

string-value:$(AppIdentifierPrefix)

Answer 4

这是@David H答案的Swift版本：

static func bundleSeedID() -> String? {
        let queryLoad: [String: AnyObject] = [
            kSecClass as String: kSecClassGenericPassword,
            kSecAttrAccount as String: "bundleSeedID" as AnyObject,
            kSecAttrService as String: "" as AnyObject,
            kSecReturnAttributes as String: kCFBooleanTrue
        ]

        var result : AnyObject?
        var status = withUnsafeMutablePointer(to: &result) {
            SecItemCopyMatching(queryLoad as CFDictionary, UnsafeMutablePointer($0))
        }

        if status == errSecItemNotFound {
            status = withUnsafeMutablePointer(to: &result) {
                SecItemAdd(queryLoad as CFDictionary, UnsafeMutablePointer($0))
            }
        }

        if status == noErr {
            if let resultDict = result as? [String: Any], let accessGroup = resultDict[kSecAttrAccessGroup as String] as? String {
                let components = accessGroup.components(separatedBy: ".")
                return components.first
            }else {
                return nil
            }
        } else {
            print("Error getting bundleSeedID to Keychain")
            return nil
        }
    }