Question

我想减少像这个网站的图像大小 http://resizeimage.net 我使用下面的代码后，我的图像是1080 x 360大小120kb 但是当我使用网站时，我得到58kb 或者如果有压缩JPEG文件的库或算法

func resizeImage(_ image: UIImage, newHeight: CGFloat) -> UIImage {
    let scale = newHeight / image.size.height
    let newWidth = image.size.width * scale
    UIGraphicsBeginImageContext(CGSize(width: newWidth, height: newHeight))
    image.draw(in: CGRect(x: 0, y: 0, width: newWidth, height: newHeight))
    let newImage = UIGraphicsGetImageFromCurrentImageContext()
    let imageData = UIImageJPEGRepresentation(newImage!, 0.5)! as Data
    UIGraphicsEndImageContext()
    return UIImage(data:imageData)!
}

Answer 1

传入UIImageJPEGRepresentation的压缩质量决定了JPEG图像的图像质量。你有0.5，尝试低于0.1的东西： let imageData = UIImageJPEGRepresentation(newImage!, 0.1)! as Data

来自Apple的文档： compressionQuality The quality of the resulting JPEG image, expressed as a value from 0.0 to 1.0. The value 0.0 represents the maximum compression (or lowest quality) while the value 1.0 represents the least compression (or best quality).

如何在swift ios中减小图像的大小

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