将图像编码为 base64 时的字符串无效 - Swift 4

Question

我的问题是当我尝试将图像编码为 base-64 时，它会生成一个长字符串（最多 200,000 行）并且在解码时不起作用，它会生成一个 nil 图像！即使我尝试将图像调整为更小的尺寸，但仍然不起作用！

这是我的图片编码代码

let image = imageView.image
let imageData:NSData = UIImagePNGRepresentation(image!)! as NSData
let strBase64 = imageData.base64EncodedString(options: .lineLength64Characters)

解码代码：

let processImage = user.value(forKey: "processImage") as! String // image from json 
if let dataDecoded:NSData = NSData(base64Encoded: processImage, options: NSData.Base64DecodingOptions.ignoreUnknownCharacters) {
          let image: UIImage = UIImage(data:dataDecoded as Data,scale:1.0)!
          print(image.size)
          self.myImage.image = image }

Answer 1

您可以尝试以下步骤：

步骤：- 1 首先从中获取 NSData

存在三种可能性：

1.使用图像名称

 let image : UIImage = UIImage(named:"imageNameHere")!
//Now use image to create into NSData format
let imageData:NSData = UIImagePNGRepresentation(image)!

2。使用 NSURL：

//Use image's path to create NSData
let url:NSURL = NSURL(string : "urlHere")!
//Now use image to create into NSData format
let imageData:NSData = NSData.init(contentsOfURL: url)!

3。从图像选择器中选取的图像

 let image = info[UIImagePickerControllerOriginalImage] as? UIImage    
 let imageData:NSData = UIImagePNGRepresentation(image)!

步骤：-2 然后编码：

    let strBase64 = imageData.base64EncodedString(options: .lineLength64Characters)
    print(strBase64)

步骤：-3 然后解码：

    let dataDecoded : Data = Data(base64Encoded: strBase64, options: .ignoreUnknownCharacters)!
    let decodedimage = UIImage(data: dataDecoded)
    yourImageView.image = decodedimage

希望对您有所帮助。

将图像编码为 base64 时的字符串无效 - Swift 4

Invalid string in encoding image to base64 - Swift 4

base64

encoding

decoding

nsdata

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