将cbuuid放入nsdata?

我试图将cbuuid字符串放入nsdata,但找不到正确的方法。以下是我尝试过的一些事情:

//NSData* UUIDsKey_data = [[NSData alloc] initWithType:[CBUUID UUIDWithString: @GENERIC_SYSTEM_DEVICE_SERVICES_UUID_iOS ]]];

    //NSData* UUIDsKey_data = [[NSData alloc] initWithData:[CBUUID UUIDWithString: @GENERIC_SYSTEM_DEVICE_SERVICES_UUID_iOS ]];

    //NSData* UUIDsKey_data = [[NSData alloc] initWithContentsOfFile:[CBUUID UUIDWithString: @GENERIC_SYSTEM_DEVICE_SERVICES_UUID_iOS ]];

   // NSData* UUIDsKey_data = [NSKeyedArchiver archivedDataWithRootObject:[CBUUID UUIDWithString: @GENERIC_SYSTEM_DEVICE_SERVICES_UUID_iOS ]];

    //NSData* UUIDsKey_data = [[NSData alloc] initWithBase64Encoding:[CBUUID UUIDWithString: @GENERIC_SYSTEM_DEVICE_SERVICES_UUID_iOS ]];

我如何转换这个?请帮忙!