piyush23dez

class GermanShephard: Barker, DrugSniffer {
}

class BelgianMalinois: Barker, Swimmer, DrugSniffer {
}

class Poodle: Barker, Swimmer {
}

let belgian = BelgianMalinois()

piyush23dez

class Foo {
       var value: Int = 0
       func doIt() {
          for index in 0..<10 {
             value = index
          }
         print(value)
       }
    }
}

piyush23dez

func threadOperation() {
    let foo = Foo()
    let queue = DispatchQueue.global(qos: .default)
    
    for _ in 0..<10 {
        queue.async {
            foo.doIt()
        }
    }
}

piyush23dez

class Foo {
    var value: Int = 0
    func doIt() {
        for index in 0..<10 {
            value = index
        }
 IP ->  print(value)
    }
}

piyush23dez

class Foo {
    var value: Int = 0
    func doIt() {
        for index in 0..<10 {
IP ->      value = index
        }
      print(value)
    }
}

piyush23dez

func threadSafeOperation() {
    let foo = Foo()
    let queue = DispatchQueue.global(qos: .default)
    let locker = NSLock()
    
    for _ in 0..<4 {
        queue.async {
            locker.lock()
            foo.doIt()
            locker.unlock()

piyush23dez

func threadSafeOperation() {
    let foo = Foo()
    let queue = DispatchQueue(label: "com.apple.serial")
    
    for _ in 0..<4 {
        queue.sync {
            foo.doIt()
        }
    }
}

piyush23dez

@objc class Person: NSObject {
    @objc dynamic var name = "Mark Swift"
}

piyush23dez

let mark = Person()

mark.observe(\Person.name, options: .new) { person, change in
    print("I'm now called \(person.name)")
}

mark.name = "Mark Zukerberg"

piyush23dez

let nc = NotificationCenter.default
nc.post(name: Notification.Name("UserLoggedIn"), object: nil)