set global thread in swift with dealy code example

Example 1: settimeout in swift

DispatchQueue.main.asyncAfter(deadline: .now() + 2.0) { // Change `2.0` to the desired number of seconds.
   // Code you want to be delayed
}

Example 2: swift thread.sleep

while (true){
    print("sleep for 2 seconds.")
    sleep(2) // working
}