Compress image data swift

compres+uiimage.swift

extension UIImage {
    var uncompressedPNGData: NSData      { return UIImagePNGRepresentation(self)!        }
    var highestQualityJPEGNSData: NSData { return UIImageJPEGRepresentation(self, 1.0)!  }
    var highQualityJPEGNSData: NSData    { return UIImageJPEGRepresentation(self, 0.75)! }
    var mediumQualityJPEGNSData: NSData  { return UIImageJPEGRepresentation(self, 0.5)!  }
    var lowQualityJPEGNSData: NSData     { return UIImageJPEGRepresentation(self, 0.25)! }
    var lowestQualityJPEGNSData:NSData   { return UIImageJPEGRepresentation(self, 0.0)!  }
}

//usage

let imageData = imagePassed.lowestQualityJPEGNSData