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Swift5でDropbox APIを使いDropbox上にある画像を表示

Last updated at 2019-12-17Posted at 2019-12-15

バージョン情報

・Swift version 5.0.1
・Xcode version 10.2.1

ダウンロードボタンを設置

ViewController.swift

import UIKit
import SwiftyDropbox

class ViewController: UIViewController {
    //イメージビューを追加
   let myImageView = UIImageView()

    override func viewDidLoad() {
       super.viewDidLoad()
       // Do any additional setup after loading the view.
       //省略

       //ダウンロードボタンを追加
       let downloadButton = UIButton(type: UIButton.ButtonType.system)
       downloadButton.frame = CGRect(x: 10, y: 220, width: 100, height: 30)
       downloadButton.setTitle("Download", for: .normal)
       downloadButton.addTarget(self, action: #selector(self.downloadDropboxFile), for: .touchUpInside)
       self.view.addSubview(downloadButton)
       
       //画像表示エリアの記載
       myImageView.frame = CGRect(x: 10, y: 500, width: 200, height: 120)
       self.view.addSubview(myImageView)
   }

ダウンロード　画面表示処理

ViewController.swift

@objc func downloadDropboxFile() {
   //ダウンロード処理
   if let client = DropboxClientsManager.authorizedClient {
       //ダウンロード先URLを設定
       let destination : (URL, HTTPURLResponse) -> URL = { temporaryURL, response in
           let directoryURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
           let UUID = Foundation.UUID().uuidString
           var fileName = ""
           if let suggestedFilename = response.suggestedFilename {
               fileName = suggestedFilename
           }
           let pathComponent = "\(UUID)-\(fileName)"
           return directoryURL.appendingPathComponent(pathComponent)
       }
       //画面描画処理
       client.files.download(path: "/logo.png", destination: destination).response { response, error in
           if let (metadata, url) = response {
               print("Downloaded file name: \(metadata.name)")
               do {
                   //urlをData型に変換
                   let data = try Data(contentsOf: url)
                   //Data型に変換したurlをUIImageに変換
                   let img = UIImage(data: data)
                   //UIImageをivに変換
                   let iv:UIImageView = UIImageView(image:img)
                   //変換したivをviewに追加
                   self.view.addSubview(iv)
                   //表示位置決定
                   iv.layer.position = CGPoint(x: self.view.bounds.width/2, y: 400.0)
               } catch let err {
                   print("Error : \(err.localizedDescription)")
               }
           } else {
               print(error!)
           }
       }
   }
}