Swift -- 将本地生成的UIImage进行持久化保存（存到文件中fileManager.createFile）

    //项目所需要的数据结构
    struct ImageSource {
    var img: UIImage
    var title: String
    
    init(img: UIImage, title: String) {
        self.img = img
        self.title = title
    }
}

    //Set方法
    var familyImgsSource:[ImageSource] = [] {
        didSet{
            collectionView.reloadData()
        }
    }
     
    //相册或者拍照的代理方法
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        
        var selectedImage:UIImage? = info[UIImagePickerController.InfoKey.editedImage] as? UIImage
        if (selectedImage == nil ) {
            selectedImage = info[UIImagePickerController.InfoKey.originalImage] as? UIImage
        }
        
        if selectedImage != nil {
            let sources = ImageSource.init(img: selectedImage!, title: "")
            familyImgsSource.append(sources)
            mySingleton.shareInstance.dataSourceImgsSingleton = familyImgsSource
            
            //UserDefaut存储图片个数
            UserDefaults.standard.set(mySingleton.shareInstance.dataSourceImgsSingleton.count, forKey: "imageCount")
            UserDefaults.standard.synchronize()
            
            //将选择的图片保存到Document目录下
            let imageCount = UserDefaults.standard.integer(forKey: "imageCount")
            var filePath = ""
            
            for i in familyImgsSource {
                //本文核心内容--图片的储存在Document目录下（文件形式）
                let fileManager = FileManager.default
                let rootPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first! as NSString
                
                for c in 0..<imageCount {
                    filePath = "\(rootPath)/pickedImage\(c).jpg"
                }
                
                let imageData = NSUIImageJPEGRepresentation(i.img, 1.0)
                fileManager.createFile(atPath: filePath, contents: imageData, attributes: nil)
            }
        }
    }
        
//在viewDidLoad初始化方法中获取存储的图片资源
override func viewDidLoad() {
        super.viewDidLoad()
        setupUI()
    }
    
func setupUI(){
        if UserDefaults.standard.integer(forKey: "imageCount") > 0 {
            var newImageSource: [ImageSource] = []
            let fileManager = FileManager.default
            let rootPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first! as NSString
            
            for i in 0..<UserDefaults.standard.integer(forKey: "imageCount"){
                
                //本文读取存储的图片核心内容
                let filePath = "\(rootPath)/pickedImage\(i).jpg"
                if fileManager.fileExists(atPath: filePath) {
                    if let imageData = fileManager.contents(atPath: filePath) {
                        //data转String
                        if let imageImage = UIImage.init(data: imageData) {
                            newImageSource.append(.init(img: imageImage, title: "张张"))
                        }
                    }
                }
            }
            
            //赋值
            familyImgsSource = newImageSource
        }
}

本文地址：https://blog.csdn.net/SoftwareDoger/article/details/107538730