import LzmaSDK_ObjC
...

// select full path to archive file with 7z extension
let archivePath = "path to archive"

// 1.1 Create reader object.
let reader = LzmaSDKObjCReader(fileURL: NSURL(fileURLWithPath: archivePath)
// 1.2 Or create with predefined archive type if path doesn't containes suitable extension
let reader = LzmaSDKObjCReader(fileURL: NSURL(fileURLWithPath: archivePath), andType: LzmaSDKObjCFileType7z)

// Optionaly: assign delegate for tracking extract progress.
reader.delegate = self

// If achive encrypted - define password getter handler.
// NOTES:
// - Encrypted file needs password for extract process.
// - Encrypted file with encrypted header needs password for list(iterate) and extract archive items.
reader.passwordGetter = {
	return "password to my achive"
}
...

// Delegate extension
extension ReaderDelegateObject: LzmaSDKObjCReaderDelegate {
	func onLzmaSDKObjCReader(reader: LzmaSDKObjCReader, extractProgress progress: Float) {
		print("Reader progress: \(progress) %")
	}
}

// Try open archive.
do {
	try reader.open()
}
catch let error as NSError {
	print("Can't open archive: \(error.localizedDescription) ")
}

var items = [LzmaSDKObjCItem]()  // Array with selected items.
// Iterate all archive items, track what items do you need & hold them in array.
reader.iterateWithHandler({(item: LzmaSDKObjCItem, error: NSError?) -> Bool in
	items.append(item) // if needs this item - store to array.
	return true // true - continue iterate, false - stop iteration
})

// Extract selected items from prev. step.
// true - create subfolders structure for the items.
// false - place item file to the root of path(in this case items with the same names will be overwrited automaticaly).
if reader.extract(items, toPath: "/Volumes/Data/1/", withFullPaths: true) {
	print("Extract failed: \(reader.lastError?.localizedDescription)")
}

// Test selected items from prev. step.
if reader.test(items) {
	print("Test failed: \(reader.lastError?.localizedDescription)")
}

// Create writer
let writer = LzmaSDKObjCWriter(fileURL: NSURL(fileURLWithPath: "/Path/MyArchive.7z"))

// Add file data's or paths
writer.addData(NSData(...), forPath: "MyArchiveFileName.txt") // Add file data
writer.addPath("/Path/somefile.txt", forPath: "archiveDir/somefile.txt") // Add file at path
writer.addPath("/Path/SomeDirectory", forPath: "SomeDirectory") // Recursively add directory with all contents

// Setup writer
writer.delegate = self // Track progress
writer.passwordGetter = { // Password getter
	return "1234"
}

// Optional settings 
writer.method = LzmaSDKObjCMethodLZMA2 // or LzmaSDKObjCMethodLZMA
writer.solid = true
writer.compressionLevel = 9
writer.encodeContent = true
writer.encodeHeader = true
writer.compressHeader = true
writer.compressHeaderFull = true
writer.writeModificationTime = false
writer.writeCreationTime = false
writer.writeAccessTime = false

// Open archive file
do {
	try writer.open()
} catch let error as NSError {
	print(error.localizedDescription)
}

// Write archive within current thread
writer.write()

// or
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0)) {
	writer.write()
}

// Compress data with compression maximum compression ratio.
let compressedData = LzmaSDKObjCBufferCompressLZMA2(sourceData, 1)
// Decompress previvously compressed data.
let decompressedData = LzmaSDKObjCBufferDecompressLZMA2(compressedData)