(iOS) TableView에서 사진 삭제하기 후 정렬하기

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate, PHPhotoLibraryChangeObserver <- 추가

 

 

• 스와이프해서 삭제버튼 나오게하는 메서드 

// tableview에 스와이프 해서 delete 버튼 나오게 하는 메서드
    func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath)
    {
        print("시스템 : \(editingStyle)")
        if editingStyle == .delete
        {
            let asset : PHAsset = self.fetch_result[indexPath.row]
            
            PHPhotoLibrary.shared().performChanges({PHAssetChangeRequest.deleteAssets([asset] as NSArray)}, completionHandler: nil)
        }
        print("시스템 : editingStyle", #function)
    }

 

• 아이템 삭제후 정렬

//아이템이 삭제되고나면 제정렬 시키는 메서드
    func photoLibraryDidChange(_ changeInstance: PHChange)
    {
        print("시스템 : ",#function)
        guard let changes = changeInstance.changeDetails(for: fetch_result)
            else
            {
            
                return
              
            }
        
        fetch_result = changes.fetchResultAfterChanges
        
        OperationQueue.main.addOperation
        {
            self.table_view.reloadSections(IndexSet(0...0), with: .automatic)
        }
    }

 

 

• 코드 전체

	//
	// ViewController.swift
	// practice2
	//
	// Created by Ik ju Song on 2019/10/28.
	// Copyright © 2019 Ik ju Song. All rights reserved.
	//
	import UIKit
	import Photos
	class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate, PHPhotoLibraryChangeObserver {
	@IBOutlet weak var table_view: UITableView!
	var fetch_result : PHFetchResult<PHAsset>!
	let image_manager : PHCachingImageManager = PHCachingImageManager()
	let cell_identifier : String = "cell"
	func requestColltion()
	{
	let cameraRoll : PHFetchResult<PHAssetCollection> = PHAssetCollection.fetchAssetCollections(with: .smartAlbum, subtype: .smartAlbumUserLibrary, options: nil)
	guard let cameraRollCollection = cameraRoll.firstObject else {
	return
	}
	let fetch_options = PHFetchOptions()
	fetch_options.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
	self.fetch_result = PHAsset.fetchAssets(in: cameraRollCollection, options: fetch_options)
	}
	override func viewDidLoad()
	{
	super.viewDidLoad()
	self.table_view.dataSource = self
	self.table_view.delegate = self
	let photo_aurthorization_status = PHPhotoLibrary.authorizationStatus()
	switch photo_aurthorization_status {
	case .authorized :
	print("접근 허가됨")
	self.requestColltion()
	case .denied :
	print("접근 불허")
	case .notDetermined:
	print("아직 응답하지 않음")
	PHPhotoLibrary.requestAuthorization({(status) in
	switch status{
	case .authorized:
	print("사용자가 허용함")
	self.requestColltion()
	OperationQueue.main.addOperation {
	self.table_view.reloadData()
	}
	case .denied:
	print("사용자가 불허함")
	default : break
	}
	})
	case .restricted:
	print("접근 제한")
	}
	PHPhotoLibrary.shared().register(self)
	// Do any additional setup after loading the view.
	}
	func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
	{
	return self.fetch_result?.count ?? 0
	}
	func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
	{
	let cell : UITableViewCell = table_view.dequeueReusableCell(withIdentifier: self.cell_identifier, for: indexPath)
	let asset : PHAsset = fetch_result.object(at: indexPath.row)
	image_manager.requestImage(for: asset, targetSize: CGSize(width: 30, height: 30), contentMode: .aspectFill, options: nil, resultHandler: {image, _ in cell.imageView?.image = image})
	return cell
	}
	// tableview에 스와이프 해서 delete 버튼 나오게 하는 메서드
	func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath)
	{
	print("시스템 : \(editingStyle)")
	if editingStyle == .delete
	{
	let asset : PHAsset = self.fetch_result[indexPath.row]
	PHPhotoLibrary.shared().performChanges({PHAssetChangeRequest.deleteAssets([asset] as NSArray)}, completionHandler: nil)
	}
	print("시스템 : editingStyle", #function)
	}
	//아이템이 삭제되고나면 제정렬 시키는 메서드
	func photoLibraryDidChange(_ changeInstance: PHChange)
	{
	print("시스템 : ",#function)
	guard let changes = changeInstance.changeDetails(for: fetch_result)
	else
	{
	return
	}
	fetch_result = changes.fetchResultAfterChanges
	OperationQueue.main.addOperation
	{
	self.table_view.reloadSections(IndexSet(0...0), with: .automatic)
	}
	}
	}

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