DeviceManager 获取 uuid

 //获取唯一标识符  （依赖 KeychainItemWrapper）
- (NSString *)setUpUUID {
    NSString *accessGroup = [self getAccesGroup];
    KeychainItemWrapper *keyChainItem=[[KeychainItemWrapper alloc]initWithIdentifier:@"KCUUID" accessGroup:accessGroup];
    NSString *strUUID = [keyChainItem objectForKey:(id)kSecValueData];
    if (strUUID==nil||[strUUID isEqualToString:@""]) {
        [keyChainItem setObject:[self gen_uuid] forKey:(id)kSecValueData];
    }
    return [keyChainItem objectForKey:(id)kSecValueData];
}

 - (NSString *)gen_uuid {
    CFUUIDRef uuid_ref=CFUUIDCreate(nil);
    CFStringRef uuid_string_ref=CFUUIDCreateString(nil, uuid_ref);
    CFRelease(uuid_ref);
    NSString *uuid=[NSString stringWithString:(__bridge NSString * _Nonnull)(uuid_string_ref)];
    CFRelease(uuid_string_ref);
    return uuid;
}

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