swift -＞ UIImage图片 / NSData 和 String 相互转化

图片 和 String 之间转换

------图片转 String

let image = UIImage();
let imgData = UIImagePNGRepresentation(image);
print(imgData?.base64EncodedString())

------String转图片

let imageStr:String ="iVBORw0KGgoAAAANSUhEUgAAADwAAAA8CAYAAAA6/NlyAAAAAXNSR0IArs4c6QAAABxpRE9UAAAAAg...gg==";
            
if var data: NSData = NSData(base64Encoded: imageStr, options:NSData.Base64DecodingOptions.ignoreUnknownCharacters)
{
                
    if var image: UIImage = UIImage(data: data as Data){
       let imageView = UIImageView(image: image)
       self.view.addSubview(imageView)
                    
    }        
}

NSData 和 String 之间转换

do {
    //data to string
    let data: Data = try Data(contentsOf: url! as URL)
    let str = String(data: data, encoding: String.Encoding.utf8)