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1.********图片压缩******

方法一： //压缩图片            let newSize:CGSize = CGSize.init(width: 50, height: 50)            UIGraphicsBeginImageContext(newSize)            image.draw(in: CGRect(x: 0, y: 0, width: newSize.width, height: newSize.height))                        let newImage = UIGraphicsGetImageFromCurrentImageContext()            UIGraphicsEndImageContext()方法二：/**     *  压缩上传图片到指定字节     *     *  image     压缩的图片     *  maxLength 压缩后最大字节大小     *     *  return 压缩后图片的二进制     */    func compressImage(image: UIImage, maxLength: Int) -> NSData? {                let newSize = self.scaleImage(image, imageLength: 300)        let newImage = self.resizeImage(image, newSize: newSize)                var compress:CGFloat = 0.9        var data = UIImageJPEGRepresentation(newImage, compress)                while data?.length > maxLength && compress > 0.01 {            compress -= 0.02              data = UIImageJPEGRepresentation(newImage, compress)        }                return data    }

3.*******图片拉升********

var normal = UIImage(named: name)!         let imageWidth = normal.size.width * 0.5        let imageHeight = normal.size.height * 0.5          normal = resizableImageWithCapInsets(UIEdgeInsetsMake(imageHeight, imageWidth, imageHeight, imageWidth))

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