How to download a file in ios programmatically

28.09.2021 By Jessica Dasch

how to download a file in ios programmatically

Most iOS app developers — and users — are not accustomed to seeing the files associated with their apps, at least not in a Finder -like or Explorer -like or even command line-like download kapwing video format. For years, the closest thing to an iOS file browser has been through apps like Photoswhere you can see individual thumbnail images of photos hinting at the fact that their content is stored in individual files. But Photos gives you no sense of how the image files are organized… In folders or subfolders? Remember that you must be running iOS 11 to follow along with this tutorial. Getting into iCloud or Dropbox support is too much for one tutorial. Configuring your app so that its files appear in the Files app is pretty simple. If you prefer to edit the Info.
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  • So, inside the block of the addOperationWithBlock: method of the main queue operation, downnload first we calculate the progress as a double value and then assign it to the downloadProgress property of the fdi object:.

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    That easy! Every time that the system reports back any progress, we reflect it to the respective progress view. First, it must be declared, so go to the private section of the interface and make its declaration:. Go and give the app a downolad now. Every time a download is over, the downloaded file must be copied from a temporary location where it resides to the Documents directory of the app.

    Previously, we implemented one of the many delegate methods provided, and using it we managed to report progress filw the user.

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    Now, we are going to implement two other delegate methods as well, where the most work will be done to the first one. This one is called by the system every time a download is over, and is our duty to write the appropriate code in order to get the file from its temporary location the third parameter of the method.

    Before I comment any further, let me present its implementation and after that I will point out the most important parts of it:. The lastPathComponent property seen above is very useful, as it provides the actual file namealong with its extension for instance, networkingoverview.

    You may wonder why we use that way to get the destination file name first, and then form the destination path with that file name, instead of using the location parameter value. Well, the truth is that the location value does not contain the actual name of the file; a random series of characters or digits is used instead.

    The next move is to check if the file already exists in the Documents directory, using the fileManager object that was instantiated at the beginning of the method, and the destinationURL value. If it already exists, then is being removed. The outcome of this is stored to the success flag. If the copying above is successful, then a series of actions must be taken.

    At first, using the getFileDownloadInfoIndexWithTaskIdentifier: private method we previously implemented, we locate the index of the respective FileDownloadInfo object in the arrFileDownloadData array, and we use the fdi pointer for easier access. Next, we indicate that the file is not being downloaded and that the download is complete.

    The taskIdentifier property gets its initial value -1while the taskResumeData property gets the nil value in case it contains any resume data.

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    Finally, using the main thread, the appropriate table view row is reloaded, so the label with the Ready text to be shown and the start and stop buttons to be hidden. The other delegate method we will implement, is useful in dowjload we want to track down any error that may occurred during a download process. As you see, we only log a message depending on whether there is an error or not.

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    However, let me clear out that is called even when a download task is cancelled, as the cancelation is treated as an error by the method. Feel free now to run the app, and initiate a download. Wait until it finishes, and then see the start-stop buttons going away, while the Ready label is appeared. Moreover, locate the Documents directory of the app on your hard drive, and confirm that the file has been downloaded.

    Until now, we are able to initiate a file download process, to track its progress and to perform any required actions upon finishing, however we still cannot pause or stop a download task. In this part, we are going to implement these two features too, so our sample app reaches the perfection even more.

    Before getting into details, let me clarify a couple of facts.

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    First of all, the phrase pause a download task is good enough to make us understand the concept of our discussion, however programmatically speaking this is not accurate. The truth is that either we want to pause or stop a download task, we must perform the same action, to cancel the task.

    Right next, it is the implementation of the pause functionality. This time, a new download task is created by using the downloadTaskWithResumeData: method of the session object. Finally, the new task identifier is stored to the respective property. Test again the app if you want. This time you can start a download, and then pause and resume it.

    Well, stoping a download will seem to you pretty straightforward, after having done all the above with the download task. In short, once the appropriate FileDownloadInfo object gets located, the downloadTask property is used to cancel the download. Note that all the other related to the downloading properties get their proper values.

    Finally, the table view row is reloaded to visually upgrade the results of our action. Now, you the app that can properly initiate, pause resume and stop a file download. So, give it a try. Nothing new takes place here. We have already met every single step, and now we just combine them.

    In any case, all or any files that are not currently being downloaded begin doing so now. Finally, the table view is reloaded to update the interface as well. After you have added the above code in the IBAction method, you can try the app and tap or click on the Start All Downloads button. Stoping all file downloads at once, is easier that starting them.

    Once again, our work almost in its entirety will take place in a loop. We will check if the isDownloading property is true, meaning that a download is in progress, and then we will cancel the respective task.

    Download files with Cloud Storage on iOS | Firebase Documentation

    Then, we will set the appropriate values to all related properties, and lastly we will reload the table view. When the app is not running and background transfers downloads or uploads are active, the system wakes the app up in case it needs any credentials or it is necessary to inform it about a complete transfer.

    The second case is what we care about in this tutorial, and to be more precise, in here ifle will add the code that will handle all downloads that finish on the background while our app is inactive. To make it more spicy, after all transfers have finished, we will show a local notification to inform us about it. Every time that the background thread of the system the deamon that is responsible for a file download of our app has messages for it, it calls the application:handleEventsForBackgroundURLSession:completionHandler: application delegate method.

    By doing so, the session identifier ifle woke the app up, along with a completion handler are passed to the app. The dowlnoad handler of the parameter must be stored locally, and called when all downloads are finished so the system knows that no more background activity is required all transfers are complete and any reserved resources to be freed up.

    Of course, upon each download finish, the URLSession:downloadTask:didFinishDownloadingToURL: delegate method is called to do all the finishing actions, such as copying the downloaded file from the temporary location to the Documents directory. At first, go to the AppDelegate.

    Next, go to the AppDelegate. As you see, the completion handler passed from the system to our app is stored to the property we just declared. The backgroundTransferCompletionHandler is the one that is called when all downloads are complete. In that method we will make the call to the completion fkle, and i will show io local notification.

    For starters, go to the top of the ViewController.

    How to download files on iPhone, iPad and iPod touch

    In the implementation proggrammatically follows, notice that we first make sure that all downloads are over. The call to the local copy of completion handler must always take place in the main thread. Beyond than calling the completion handler, you see that we setup and present a simple local notification, without playing proframmatically sound or showing a badge number to the app icon.

    Of course, in a real-world app the handling code could differentiate from the above, but the important is that you are now aware of the actions you should programmatically. The purpose of this button is to re-initialize everything, so we can test the app without having to terminate and re-launch it.

    More specifically, when tapping this button, the properties of all the FileDownloadInfo objects will get their initial values, and all the downloaded files will be removed from the Documents directory. The downlosd job will take place in the yow IBAction method. Here is the implementation:. Note that this feature on the sample app is totally auxiliary, and it has nothing to do with the Background Transfer Service.

    How to install an iOS app programmatically? Ask Question. Asked 9 years, 8 months ago. Active 4 years ago. Viewed 3k times. Improve this question. Shweta Pande Shweta Pande 23 1 1 silver badge 3 3 bronze badges. For AppStore apps, NO. Jailbroken phones, Maybe. Add a comment. Active Oldest Votes. You can't, at least not from the device.


    Caveat: I mean a non-jailbroken device. Improve this answer.

    Apr 01,  · The current solution to solve this for Bitcode enabled apps is to manually download the dSYM files from Apple and upload them to your crash reporting service. Downloading the files can be done either using Xcode or iTunes Connect. Download dSYM symbolication files using the Xcode Organizer. Download dSYM symbolication files from . In a previous tutorial I presented a specific new multitasking feature in iOS 7, the Background Fetch, showing how easy it is to make an app to schedule downloads in the background. In this tutorial, I am going to work with another great multitasking feature, named Background Transfer Service.. Prior to iOS 7, only a few kinds of application were allowed to download resources Estimated Reading Time: 8 mins. Identify iOS Firmware File to Download based on your iPhone Model. Note: If you’re downloading the firmware file using Safari then ensure that auto unzip feature is disabled or use Chrome or Firefox. Direct Download iOS 15 IPSW links for iPhone: iOS (iPhone 6s):

    Stephen Darlington Stephen Darlington Sign up or log in Sign up using Google. Sign up using Facebook. Once iOS finishes reading the document, a completion handler is called, letting me know that data is ready and giving me the opportunity to display that data. Make note for later in this tutorial: Calling open completionHandler: leads to a call to load fromContents:ofType:.

    I close the document asynchronously. The completion handler is called when writing finishes, signalling me whether the save was successful or not.

    How to Integrate Your App with Files App in iOS 11 | Swift Tutorial

    I save the file in place — to the same URL from which it was opened. See more detailed discussion below. As part hkw the process of creating UIDocument -centric or Files app-like projects, or whatever you want to call it, one of the key steps is creating a subclass of UIDocument.

    how to download a file in ios programmatically

    There are so many different types progammatically file formats. As a reminder of my last AppCoda tutorialthe subject of which was design patterns, I emphasize that:. UIDocument provides no support for managing document views. App template file: Document. For my purposes, supporting the display and editing of text files and supporting the display of image rpogrammatically, I subclassed UIDocument as shown below.

    I need to know the file type so I can return the right type of data from the model. Use the load fromContents:ofType: method when opening a file, tto. I use optional ti to prevent from reading a nil value. Let me show you jn my app, built from the code shown above, and based on the Xcode Document Based App template, works.

    If your business model relies heavily on storing and manipulating information in flat files, then then a Files app interface based on the iOS UIDocumentBrowserViewController and UIDocument classes could be just the right tool for you. You can incorporate these classes into an existing app or start with the Xcode Document Based App template.

    This document-centric model can be very convenient for apps that manipulate or manage documents like image files, audio files, video files, etc. One specific subject comes to my mind, that of a situation in which your business model involves many different file formats which are intended to basically store the same information, and you need portability, and you need to convert between different formats.

    Think of word processing and how often people convert their files between formats like Pages, Word, and PDF. You can download one of my iPad-based apps to see an example of converting between many different files formats here. Programmtaically and well-published author and software developer now specializing in iOS mobile app development in Objective-C and Swift.