Unzipping downloaded files in iOS

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I’ve used ZipArchive with success in the past. It’s pretty ligthweight and simple to use, supports password protection, multiple files inside a ZIP, as well as compress & decompress.

The basic usage is:

NSString *filepath = [[NSBundle mainBundle] pathForResource:@"ZipFileName" ofType:@"zip"];
ZipArchive *zipArchive = [[ZipArchive alloc] init];
[zipArchive UnzipOpenFile:filepath Password:@"xxxxxx"];
[zipArchive UnzipFileTo:{pathToDirectory} overWrite:YES];
[zipArchive UnzipCloseFile];
[zipArchive release];

more examples about this package here

I have also tried SSZipArchive in some projects.
Below line would unzip your zip file. 

[SSZipArchive unzipFileAtPath:path toDestination:destination];

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