Blur UIImage iOS Swift

gistfile1.swift

func imageWithGaussianBlur(image: UIImage) -> UIImage{
        var weight:[CGFloat] = [0.1870270270, 0.2345945946, 0.1816216216, 0.0940540541, 0.0762162162, 0.0940540541, 0.16162162162, 0.1962162162, 0.2040540541, 0.0662162162]
        UIGraphicsBeginImageContextWithOptions(image.size, Bool(false), image.scale)
        image.drawInRect(CGRectMake(0, 0, image.size.width, image.size.height), blendMode: kCGBlendModeNormal, alpha: weight[0])
        
        var blurCount  = Int(blurAmount)
        
        if(blurCount > 9){
            blurCount = 9
        }
        
        for index in 1...blurCount {
            image.drawInRect(CGRectMake(CGFloat(index), 0, image.size.width, image.size.height), blendMode: kCGBlendModeNormal, alpha: weight[index])
            image.drawInRect(CGRectMake(CGFloat(-index), 0, image.size.width, image.size.height),blendMode: kCGBlendModeNormal, alpha: weight[index])
        }
        var horizBlurredImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        UIGraphicsBeginImageContextWithOptions(image.size, Bool(false), image.scale)
        horizBlurredImage.drawInRect(CGRectMake(0, 0, image.size.width, image.size.height), blendMode:kCGBlendModeNormal, alpha:weight[0] )
        for index in 1...blurCount {
            horizBlurredImage.drawInRect(CGRectMake(0, CGFloat(index), image.size.width, image.size.height), blendMode:kCGBlendModeNormal, alpha:weight[index])
            horizBlurredImage.drawInRect(CGRectMake(0, CGFloat(-index), image.size.width, image.size.height), blendMode:kCGBlendModeNormal, alpha:weight[index])
        }
        var blurredImage = UIGraphicsGetImageFromCurrentImageContext()
        
        UIGraphicsEndImageContext()
        return blurredImage
    }