Swift图片和Base64互相转换

Swift 5 图片和Base64互相转换，话不多说，直接上代码：

import UIKit

class ViewController1: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.navigationItem.title = "Main View"
        
        let imageView = UIImageView()
        imageView.frame = CGRect(x: 50, y: 50, width: 200, height: 200)
        imageView.contentMode = .scaleAspectFit
        view.addSubview(imageView)
        
        //Convert image to Base 64 String
        let myImageName = "apple.png"
        let myImage = UIImage(named: myImageName)
        imageView.image = myImage
        let imageStringData = convertImageToBase64(image: myImage!)
        print("IMAGE base64 String: \(imageStringData)")
        
        //Convert Base 64 String back to Image
        let imageView2 = UIImageView()
        imageView2.frame = CGRect(x: 300, y: 50, width: 200, height: 200)
        imageView2.contentMode = .scaleAspectFit
        view.addSubview(imageView2)
        imageView2.image = convertBase64ToImage(imageString: imageStringData)
        
        
    }
    
    func convertImageToBase64(image: UIImage) -> String {
        let imageData = image.pngData()!
        return imageData.base64EncodedString(options: Data.Base64EncodingOptions.lineLength64Characters)
    }
    
    func convertBase64ToImage(imageString: String) -> UIImage {
        let imageData = Data(base64Encoded: imageString,
                             options: Data.Base64DecodingOptions.ignoreUnknownCharacters)!
        return UIImage(data: imageData)!
    }
    
    
}