Grand Central Dispatch examples

Grand_Central_Dispatch.swift

// # Serial queue 
// Creating a custom serial queue with a specific label
let customQueue = DispatchQueue(label: "com.example.myqueue")

// Adding a task to the custom queue
customQueue.sync {
    // Perform some work here
}

// # Concurrent queue
// Creating a custom concurrent queue with a specific label
let customConcurrentQueue = DispatchQueue(label: "com.example.myconcurrentqueue", attributes: .concurrent)

// Adding tasks to the custom concurrent queue
customConcurrentQueue.async {
    // Task 1: Perform some work here
}

customConcurrentQueue.async {
    // Task 2: Perform some work here
}

customConcurrentQueue.async {
    // Task 3: Perform some work here
}

// # Perform background tasks and also update UI.
DispatchQueue.global(qos: .background).async { 
    // Call your background task
    DispatchQueue.main.async { 
       // UI Updates here for task complete.
    }
}

// # DispatchQueue with delay
let deadlineTime = DispatchTime.now() + .seconds(1)
DispatchQueue.main.asyncAfter(deadline: deadlineTime) {
    //Perform code here
}

// # Sync and Async
func syncExamples() {
    let people = DispatchQueue(label: "syncExamples.queue.people")
    let age = DispatchQueue(label: "syncExamples.queue.age")
    
    people.sync {
        for name in ["Jack", "John", "Macheal"] {
            print(name)
        }
    }
    
    age.sync {
        for age in [29, 34, 73] {
            print(age)
        }
    }
}

syncExamples()

func asyncExamples() {
    let people = DispatchQueue(label: "syncExamples.queue.people")
    let age = DispatchQueue(label: "syncExamples.queue.age")
    
    people.async {
        for name in ["Jack", "John", "Macheal"] {
            print(name)
        }
    }
    
    age.async {
        for age in [29, 34, 73] {
            print(age)
        }
    }
}

asyncExamples()