在做发送图片的时候发现,iOS发送给安卓的base64文件时,安卓解压读取会崩溃,原因说是由于图片过大.下面是一种压缩图片又避免失真特严重的方法

//压缩图片

extension UIImage {

    func resizeImage(image: UIImage, newSize: CGSize) -> UIImage {

        UIGraphicsBeginImageContextWithOptions(newSize, false, UIScreen.main.scale)

        image.draw(in: CGRect(x: 0, y: 0, width: newSize.width, height: newSize.height))

        var newImage = UIGraphicsGetImageFromCurrentImageContext()

        UIGraphicsEndImageContext()

        let data:NSData = UIImageJPEGRepresentation(newImage!, 1)! as NSData

        print(data.length / 1000)

        if data.length / 1000 > 150 {

            let size = CGSize.init(width: (newImage?.size.width)! / 5, height: (newImage?.size.height)! / 5)

            UIGraphicsBeginImageContextWithOptions(size, false, UIScreen.main.scale)

            image.draw(in: CGRect(x: 0, y: 0, width: size.width, height: size.height))

            newImage = UIGraphicsGetImageFromCurrentImageContext()

            UIGraphicsEndImageContext()

        }

        let dataNew:NSData = UIImageJPEGRepresentation(newImage!, 1)! as NSData

        print(dataNew.length / 1000)

        if dataNew.length / 1000 > 150 {

            let size = CGSize.init(width: (newImage?.size.width)! / 5, height: (newImage?.size.height)! / 5)

            UIGraphicsBeginImageContextWithOptions(size, false, UIScreen.main.scale)

            image.draw(in: CGRect(x: 0, y: 0, width: size.width, height: size.height))

            newImage = UIGraphicsGetImageFromCurrentImageContext()

            UIGraphicsEndImageContext()

        }

        return newImage!

    }

}