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How to load a string from a website URL - free Swift example code and tips
Dec 17, · This example will remove any previous file that was already downloaded and write the latest version. /// Downloads a file asynchronously func loadFileAsync(url: URL, completion: @escaping (Bool) -> Void) { // create your document folder url let documentsUrl = try! Mar 28, · Create URL to the source file you want to download, Use URLSession to download a file from a remote URL, Copy downloaded file from a temporary URL to a destination URL on the device, Handle file download SUCCESS and ERROR situations May 28, · How to load a string from a website URL. Swift version: Paul Hudson @twostraws May 28th It takes just a few lines of Swift code to load the contents of a website URL, but there are three things you need to be careful with
Swift 3 download file from url
Update November Fully updated for Xcode 8 and Swift 3. You will often need to download content to use in your app, swift 3 download file from url. NSURLConnection used to be a great interface to perform networking tasks along with NSURLSession. In this tutorial, you gonna use the URLSession download task to download a file remotely to your app and report the progress to the user while bytes are being downloaded. The project you will build by the end of this tutorial will download a PDF file and load it on the screen.
If you take a look at the user interface in the starter project, there is already four buttons to manage the download operation, swift 3 download file from url.
There is also a progress view to report the download progress instantly to the user. The URLSession hierarchy requires a specific configuration. When a session object is about to be created, it needs a configuration object that define the behavior and policies to use when uploading and downloading content.
In this tutorial, you gonna use a background session configuration in order to allow HTTP download to be performed in the background. Select the ViewController. swift file from the Project navigator view and add the following properties declarations:. The properties above are declared as implicitly unwrapped optionals which explains why you put the exclamation mark after their types.
Declaring the properties this way will relieve us from using the question mark? each time you use the property to unwrap its value, since we know the property value is confirmed to exist immediately after the optional is first defined.
The code above will instantiate a background session configuration object and use it to create an URLSession instance. As I said earlier, the background session configuration is what enables the session object to carry on the download in the background.
You also set the progress property of the UIProgressView object to 0 to get ready for the download operation. Then it will instantiate an URLSessionDownloadTask object to initiate and manage the download operation of the file.
Calling the resume method will start the download task immediately. Starting the download operation will imply some events to be raised by the download task object i. e: Bytes are being downloaded, file did finish downloading, etc. To react to such events accordingly, you will need to implement some protocol methods. First, make the class conform to the URLSessionDownloadDelegate protocol by changing the class declaration to the following:.
Next, swift 3 download file from url, implement the following URLSessionDownloadDelegate protocol methods before the class closing bracket:. You just checked whether the file already exists. If so, the code will load the file immediately, otherwise, it will move it to a new location before loading it. Embedding the moveItem method inside a do-catch bloc is mandatory since this method may throw errors. Precisely the totalBytesWritten and totalBytesExpectedToWrite parameters. As the method periodically informs the delegate about the download progress, you just calculated the downloaded bytes and updated the progress view accordingly.
Copy the following code inside the class:. The method above will use the path string to load the file using the UIDocumentInteractionController class. UIDocumentInteractionController requires a delegate as well as implementing a UIDocumentInteractionControllerDelegate protocol method in order to be able to load a preview screen for the file.
The method above will return the current view controller as the preview controller of the PDF file. To do so, copy the following URLSessionTaskDelegate protocol method inside the class:. Select the Info.
plist file from the Project navigator view and make the following changes:. As usual, you can download the final project here, swift 3 download file from url. Also, the tutorial forum thread is here in case you have related questions. Feel free to open a new thread if you want to ask me other technical questions, I am here to help you.
Skip to content Update November Fully updated for Xcode 8 and Swift 3. swift file from the Project navigator view and add the following properties declarations: var downloadTask: URLSessionDownloadTask! var backgroundSession: URLSession! URLSession configuration: backgroundSessionConfiguration, delegate: self, delegateQueue: OperationQueue. main progressView. setProgress 0.
downloadTask with: url downloadTask. documentDirectory, FileManager. pdf" if fileManager. fileExists atPath: destinationURLForFile. path { showFileWithPath path: destinationURLForFile. path } else{ do { try fileManager.
Copy the following code inside the class: func showFileWithPath path: String { let isFileFound:Bool? presentPreview animated: true } } The method above will use the path string to swift 3 download file from url the file using the UIDocumentInteractionController class. Change the pause, the resume and the cancel methods implementations to the following: IBAction func pause sender: AnyObject { if downloadTask! suspend } } IBAction func resume sender: AnyObject { swift 3 download file from url downloadTask!
resume } } IBAction func cancel sender: AnyObject { if downloadTask! iOS 10ios developmentnative ios appSwift 3UIDocumentInteractionControllerURLSessionURLSessionDownloadDelegateURLSessionDownloadTaskXcode 8. Malek is an iOS developer with over than 9 years of intensive working experience shipping iOS apps to the store. You can hire me for your swift 3 download file from url on Upwork.
iOS Tutorial Make a PDF Downloader and Reader from scratch in Swift 3 - Part 1
, time: 26:46Swift 3 download file from url
Aug 12, · im new in programming and have a project with wkwebkit written is swift 3 that load page with an ipa file in a url but the wkwebkit cant install the app unlike the uiwebview this is the code import UIKit import WebKit var WEB: WKWebView! class FirstViewController: UIViewController, Nov 04, · Download, Store, and View PDF in Swift. To download the file from an URL, we need to use downloadTask. Since we also need to tack where the location had the task have placed our files Estimated Reading Time: 2 mins Jul 03, · Hey guys, welcome to another post, which is Get Image From URL Swift 3. So basically we will learn how to get image from URL in Swift 3 or we can say downloading images in Swift 3. Get Image From URL Swift 3 Tutorial Video. You can also go through this video blogger.comted Reading Time: 3 mins
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