How to unzip a .zip file on iOS?

Use Zip Foundation if you are working in Swift language. It's easy to use and one of the best swift library for unzipping a zip file.

Zip:

let fileManager = FileManager()
let currentWorkingPath = fileManager.currentDirectoryPath
var sourceURL = URL(fileURLWithPath: currentWorkingPath)
sourceURL.appendPathComponent("file.txt")
var destinationURL = URL(fileURLWithPath: currentWorkingPath)
destinationURL.appendPathComponent("archive.zip")
do {
    try fileManager.zipItem(at: sourceURL, to: destinationURL)
} catch {
    print("Creation of ZIP archive failed with error:\(error)")
}

UnZip:

let fileManager = FileManager()
let currentWorkingPath = fileManager.currentDirectoryPath
var sourceURL = URL(fileURLWithPath: currentWorkingPath)
sourceURL.appendPathComponent("archive.zip")
var destinationURL = URL(fileURLWithPath: currentWorkingPath)
destinationURL.appendPathComponent("directory")
do {
    try fileManager.createDirectory(at: destinationURL,             withIntermediateDirectories: true, attributes: nil)
try fileManager.unzipItem(at: sourceURL, to: destinationURL)
} catch {
    print("Extraction of ZIP archive failed with error:\(error)")
}

If you are using Objective-C then SSZipArchive is the best choice for this.

You can unzip using this

NSArray  *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *outputPath = [documentsDirectory stringByAppendingPathComponent:@"/ImagesFolder"];

NSString *zipPath = Your zip file path;

[SSZipArchive unzipFileAtPath:zipPath toDestination:outputPath delegate:self];

Hope it helps you.

There is a great 3rd party tool for zipping/unzipping files for iPhone

https://github.com/soffes/ssziparchive

Very simple to use. Hope that helps!!

Edit:

Quick method I created which takes url, downloads the zip and unzips it

-(void)downloadAndUnzip : (NSString *)sURL_p : (NSString *)sFolderName_p
{
    dispatch_queue_t q = dispatch_get_global_queue(0, 0);
    dispatch_queue_t main = dispatch_get_main_queue();
    dispatch_async(q, ^{
        //Path info
        NSURL *url = [NSURL URLWithString:sURL_p];
        NSData *data = [NSData  dataWithContentsOfURL:url];
        NSString *fileName = [[url path] lastPathComponent];
        NSString *filePath = [NSTemporaryDirectory() stringByAppendingPathComponent:fileName];
        [data writeToFile:filePath atomically:YES];
        dispatch_async(main, ^


                 {
                       //Write To
                       NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
                       NSString *documentsDirectory = [paths objectAtIndex:0]; // Get documents folder
                       NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:sFolderName_p];

                       [SSZipArchive unzipFileAtPath:filePath toDestination:dataPath];

                   });
});

}