Byte Array to NSData

In a WebService JSON response is coming. In the response, there is image is coming as a byte array. I have to show the image in a UIImageView. I am trying to convert the byte array to NSData. But not getting how to do that. Any help would be appreciated. I am confident that the byte array has image data in it. Sample Byte array for your reference:

        (137,
        80,
        78,
        71,
        ...
        66,
        96,
        130)

Thanks