extension UIImage {

     /// 高斯模糊

     func gaussianBlur(var blurAmount:CGFloat) -> UIImage {

         //高斯模糊参数(0-1)之间，超出范围强行转成0.5

         if (blurAmount < 0.0 || blurAmount > 1.0) {

             blurAmount = 0.5

         }

         var boxSize = Int(blurAmount * )

         boxSize = boxSize - (boxSize % ) + 

         let img = self.CGImage

         var inBuffer = vImage_Buffer()

         var outBuffer = vImage_Buffer()

         let inProvider =  CGImageGetDataProvider(img)

         let inBitmapData =  CGDataProviderCopyData(inProvider)

         inBuffer.width = vImagePixelCount(CGImageGetWidth(img))

         inBuffer.height = vImagePixelCount(CGImageGetHeight(img))

         inBuffer.rowBytes = CGImageGetBytesPerRow(img)

         inBuffer.data = UnsafeMutablePointer<Void>(CFDataGetBytePtr(inBitmapData))

         //手动申请内存

         let pixelBuffer = malloc(CGImageGetBytesPerRow(img) * CGImageGetHeight(img))

         outBuffer.width = vImagePixelCount(CGImageGetWidth(img))

         outBuffer.height = vImagePixelCount(CGImageGetHeight(img))

         outBuffer.rowBytes = CGImageGetBytesPerRow(img)

         outBuffer.data = pixelBuffer

         var error = vImageBoxConvolve_ARGB8888(&inBuffer,

             &outBuffer, nil, vImagePixelCount(), vImagePixelCount(),

             UInt32(boxSize), UInt32(boxSize), nil, vImage_Flags(kvImageEdgeExtend))

         if (kvImageNoError != error)

         {

             error = vImageBoxConvolve_ARGB8888(&inBuffer,

                 &outBuffer, nil, vImagePixelCount(), vImagePixelCount(),

                 UInt32(boxSize), UInt32(boxSize), nil, vImage_Flags(kvImageEdgeExtend))

             if (kvImageNoError != error)

             {

                 error = vImageBoxConvolve_ARGB8888(&inBuffer,

                     &outBuffer, nil, vImagePixelCount(), vImagePixelCount(),

                     UInt32(boxSize), UInt32(boxSize), nil, vImage_Flags(kvImageEdgeExtend))

             }

         }

         let colorSpace =  CGColorSpaceCreateDeviceRGB()

         let ctx = CGBitmapContextCreate(outBuffer.data,

             Int(outBuffer.width),

             Int(outBuffer.height),

             ,

             outBuffer.rowBytes,

             colorSpace,

             CGImageAlphaInfo.PremultipliedLast.rawValue)

         let imageRef = CGBitmapContextCreateImage(ctx)

         //手动申请内存

         free(pixelBuffer)

         return UIImage(CGImage: imageRef!)

     }

 }