保存照片swiftUI

//
//  LocalFileManager.swift
//  SwiftUIByExample
//
//  Created by wangxuncai on 2021/10/7.
//

import Foundation
import SwiftUI

class LocalFileManager{
    static let instance = LocalFileManager()
    private init(){}
    
    //保存照片
    func saveImage(image:UIImage,imageName:String,foldName:String){
        creatFolderIfNeeded(folderName: foldName)
        guard
            let data = image.pngData(),
            let url = getImageUrl(imageName: imageName, foldName: foldName)
        else{return}
        do {
            try data.write(to: url)
        } catch let error {
            print("save image failed . \(error)")
        }
    }
    //获取照片
    func getImage(imageName:String,folderName:String)->UIImage?{
        guard
            let url = getImageUrl(imageName: imageName, foldName: folderName),
            FileManager.default.fileExists(atPath: url.path) else {
                return nil
            }
        return UIImage(contentsOfFile: url.path)
    }
    
    //create folder
    private func creatFolderIfNeeded(folderName:String){
        guard let url = getFoldUrl(foldName: folderName) else {return}
        if !FileManager.default.fileExists(atPath: url.path){
            do {
                try FileManager.default.createDirectory(at: url, withIntermediateDirectories: true, attributes: nil)
            } catch let error {
                print("creat Folder  failed .\(error)")
            }
        }
    }
    //get url
 private   func getFoldUrl(foldName:String)->URL?{
        guard   let url = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else{
            return nil
        }
        return url.appendingPathComponent(foldName)
    }
  //get image url
    private func getImageUrl(imageName:String,foldName:String)->URL?{
        guard let url = getFoldUrl(foldName: foldName) else{return nil}
        return url.appendingPathComponent(imageName).appendingPathExtension(".png")
    }
}

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