IOS7.0惟一“设备ID”的获取方法

ios7.0 之后经过sysctl得到的mac地址已经失效，全部设备均为020000000000.

能够经过苹果的keychain机制，实现设备的惟一ID标示。

具体过程：在app第一次安装时，生成一个惟一的ID，将该ID保存到keychain中。keychain内的id并不会由于app的卸载而失效，下次安装或者更新仍然能够取到这个惟一的ID，从而能够找到这个设备对应的帐号。
注：惟一ID的生成，能够经过程序本身的算法如guid，或者用苹果自带的IDFV([[UIDevice currentDevice]] identifierForVendor]]）.

如下是具体代码：

static KeychainItemWrapper * s_pWrapper = Nil;

// 获取开发者的ID
NSString * getAppID() {
  NSDictionary *query = [NSDictionary dictionaryWithObjectsAndKeys:
      (id)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 = [(NSDictionary *)result objectForKey:(id)kSecAttrAccessGroup];
  NSArray *components = [accessGroup componentsSeparatedByString:@"."];
  NSString *bundleSeedID = [[components objectEnumerator] nextObject];
  CFRelease(result);
  return bundleSeedID;
}

// 获取设备惟一ID
std::string getUniqueID()
{
  if (s_pWrapper == Nil) {
#if TARGET_IPHONE_SIMULATOR
    s_pWrapper = [[KeychainItemWrapper alloc] initWithIdentifier:@"YourAPP"
    accessGroup:Nil];
#else
    NSString* boundSeedID = getAppID();
    NSString* appID = @".com.YourCompany.YourAPP";
    NSString* groupID = [boundSeedID stringByAppendingString:appID];
    s_pWrapper = [[KeychainItemWrapper alloc] initWithIdentifier:@"YourAPP"
    accessGroup:groupID];
#endif
  // [s_pWrapper resetKeychainItem];
  }

  // 是否已注册过
  NSString *key = [s_pWrapper objectForKey:(id)kSecValueData];
  if (key != Nil && key.length > 0) {
      return [key UTF8String];
  }

  // 7.0系统取IDFV做为惟一标示
  NSUUID* uuid = [[UIDevice currentDevice] identifierForVendor];
  key = [uuid UUIDString];

  // 注册到keychain中
  [s_pWrapper setObject:(id)key forKey:(id)kSecAttrAccount];
  [s_pWrapper setObject:(id)key forKey:(id)kSecAttrService];
  [s_pWrapper setObject:(id)key forKey:(id)kSecValueData];

  return [key UTF8String];
}

 

注：

一、KeychainItemWrapper为apple官方提供的一个sample里面的代码，连接https://developer.apple.com/library/ios/samplecode/GenericKeychain/Listings/Classes_KeychainItemWrapper_m.html
二、在项目的Capabilities属性下，将Keychain sharing改为Enable。项目中会自动添加一个entitlements文件。