JHDownloadManager

Installation

JHDownloadManager is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod "JHDownloadManager", "~> 1.0.2"

Features

Ability to download a batch of files.
Checksum (MD5, SHA1, SHA512) / File Size is verified once a file has been downloaded. Auto redownload file if Checksum / File Size is mismatched.
Auto resume on internet connection recovery.
Overall Progress & individual download progress
Downloading Rate Computation
Remaining Time Computation

Usage

JHDownloadManager

JHDownloadManager can perform download on a batch of URL strings or NSURL objects.

Only URL and Destination are compulsory in each of the dowloading information. url can be string or NSURL object
If fileSize is not supplied, the download manager will trigger a HEAD request to query for content length to fill in fileSize.
If checksum is supplied, the download manager will verify againsts the downloaded file's checksum. If no checksum is supplied, the verification will be only based on the fileSize. Default file hashing algorithm is SHA1. You can change by using

let downloadManager = JHDownloadManager.sharedInstance
downloadManager.fileHashAlgorithm = FileHashAlgorithm.MD5

If the final verification on downloaded file is failed, the file will be queued to be downloaded again.

import JHDownloadManager

let downloadManager = JHDownloadManager.sharedInstance
downloadManager.downloadBatch([
[
"url": "http://87.76.16.10/test10.zip",
"destination": "test/test10.zip",
"fileSize": 11536384,
"checksum": "5e8bbbb38d137432ce0c8029da83e52e635c7a4f",
"identifier": "Content-1001"
],
[
"url": "http://speedtest.dal01.softlayer.com/downloads/test100.zip",
"destination": "test/test100.zip",
"fileSize": 104874307,
"checksum": "592b849861f8d5d9d75bda5d739421d88e264900",
"identifier": "Content-1002"
]
])

Alternatively, you can add a batch to downloadManager instance first and then call startDownloadingCurrentBatch later

downloadManager.addBatch([
...
])

...

downloadManager.startDownloadingCurrentBatch()

You can set initial downloaded bytes - this will help to calculate the overall progress if you have already have some downloaded files from last download

let downloadManager = JHDownloadManager.sharedInstance
downloadManager.setInitialDownloadedBytes(1024)

You can set total bytes for helping to calculate the overall progress. This total byte will override the calculation of the actual total bytes to be received of each download.

let downloadManager = JHDownloadManager.sharedInstance
downloadManager.setTotalBytes(1048576)

By default, the checksum algorithm to verify the downloaded file is SHA1. You can change this by using

let downloadManager = JHDownloadManager.sharedInstance
downloadManager = FileHashAlgorithm.MD5;
// downloadManager.fileHashAlgorithm = FileHashAlgorithm.SHA512;
// downloadManager.fileHashAlgorithm = FileHashAlgorithm.SHA1; // default

JHDownloadManagerUIDelegate

JHDownloadManagerUIDelegate can be used to update progress of the batch download and update finish status of the whole batch

// let downloadManager = JHDownloadManager.sharedInstance
// downloadManager.uiDelegate = self;
// ...
func didReachProgress(progress:Float) {
// this method runs on main thread
// ... update progress bar or progress text here
}

func didFinishAll() {
// this method runs on main thread
// ... update completed status of the whole batch
}

func didFinishOnDownloadTaskUI(task:JHDownloadTask) {
// this method runs on main thread
// ... update completed status of a download task
}

func didReachIndividualProgress(progress:Float, task:JHDownloadTask) {
// this method runs on main thread
// ... update progress of a task
}

JHDownloadManagerDataDelegate

JHDownloadManagerDataDelegate can be used to process file after finish downloading

// let downloadManager = JHDownloadManager.sharedInstance
// downloadManager.dataDelegate = self
// ...
func didFinishDownloadObject(task: JHDownloadTask) {
// this method runs on background thread
}

func didFinishAllForDataDelegate() {
// this method is run on background thread
// do whatever needs to be done after a batch has been downloaded successfully
}

JHDownloadTask

In didFinishDownloadObject you will receive an JHDownloadTask instance. Inside this instance, you will be able to retrieve the following attributes

let url:NSURL = task.url
let urlString:String = task.urlString
let destination:String = task.destination // destination is the full path to the downloaded file
let fileName:String = task.fileName
let checksum:String = task.checksum
let identifier:String = task.identifier

Additional Functionality

You can add a download task to current batch:

let downloadManager = JHDownloadManager.sharedInstance
downloadManager.addDownloadTask(["url": "http://download.thinkbroadband.com/5MB.zip", "destination": "test/5MB.zip"])

You can get out the current list of downloading tasks

let downloadManager = JHDownloadManager.sharedInstance
let currentDownloadTask = downloadManager.downloadingTasks()

To get the downloading rate and remaining time:

let downloadRateAndRemaining = JHDownloadManager.sharedInstance.downloadRateAndRemainingTime()
let downloadRate:String = downloadRateAndRemaining[0];
let remainingTime:String = downloadRateAndRemaining[1];

To check if the download manager is downloading:

let isDownloading = JHDownloadManager.sharedInstance.isDownloading()

Running Example

git clone git@github.com:jameshuynh/JHDownloadManager.git

Double click on JHDownloadManager/Example/JHDownloadManager.xcworkspace
Cmd + R to run the example project :-)

Contribution

Contribution, Suggestion and Issues are very much appreciated :). Please also fork and send your pull request!

Author

James Huynh, jameshuynhsg@gmail.com

License

JHDownloadManager is available under the MIT license. See the LICENSE file for more info.