mahmudahsan

import errno
import shutil

def copy(src, dest):
    try:
        shutil.copytree(src, dest)
    except OSError as e:
        # If the error was caused because the source wasn't a directory
        if e.errno == errno.ENOTDIR:
            shutil.copy(src, dest)

mahmudahsan

def pListModification():
    bundleName = "MY APP"
    bundleIdentifier = "net.myapp"
    
    plistNote ="app_directory/app_name/" + "/App/App-Info.plist"
    

    plistNoteData   = plistlib.readPlist(plistNote)

    plistNoteData['CFBundleDisplayName'] = "New My App"

mahmudahsan

def openNotesXcodeProject():
    print("My App XCODE OPENING")
    pathToOpen = "/app_directory/app_name/"+ "App.xcworkspace"
    openFile   = "open " + "'" + pathToOpen + "'"
    os.system(openFile)

mahmudahsan

import UIKit
import PlaygroundSupport

//to run serial queue in playground always make the following true
PlaygroundPage.current.needsIndefiniteExecution = true

let mainQueue   = DispatchQueue.main
let globalQueue = DispatchQueue.global()
let serialQueue = DispatchQueue(label: "net.ithinkdiff.app")
let concurQueue = DispatchQueue(label: "net.ithinkdiff.app.concurr", attributes: .concurrent)

mahmudahsan

import UIKit
import PlaygroundSupport
PlaygroundPage.current.needsIndefiniteExecution = true

let workingQueue = DispatchQueue(label: "net.ithinkdiff.app", attributes: .concurrent)
let globalQueue  = DispatchQueue.global()
let defaultGroup = DispatchGroup()    //create a new group

func multiplication(_ num: (Int, Int)) -> Int{
    sleep(1) //to make the method slower

mahmudahsan

//Single BlockOperation 
var result:Int?
let multiplication = BlockOperation{
    result = 5 * 10
}
multiplication.start()
result
[/code]

Multiple operations using BlockOperation:

mahmudahsan

let pairOfNumbers = [(2, 3), (5, 10), (4, 5)]

class MultiplcationOp : Operation{
    var inputPair: [(Int, Int)]?
    
    override func main() {
        guard let inputPair = inputPair else { return }
        for pair in inputPair{
            let result = pair.0 * pair.1
            print(result)

mahmudahsan

import UIKit
import PlaygroundSupport
PlaygroundPage.current.needsIndefiniteExecution = true

let pairOfNumbers  = [(2, 3), (5, 10), (4, 5)]
let operationQueue = OperationQueue()

//if set 1, it will be serial if commented it will be concurrent
operationQueue.maxConcurrentOperationCount = 1

mahmudahsan

enum SampleError: Error {
    case sample1
    case sample2(message: String)
}

mahmudahsan

func sampleThrowError() throws -> String {
    throw SampleError.sample1
    return ""
}