how to execute function after the view is loaded swift4

Question

I am trying to execute a function after the view has appeared.

I have tried series of steps I tried wait()

override func viewDidLoad()
{
    super.viewDidLoad()

    let w = UnsafeMutablePointer<Int32>.allocate(capacity: 20)
    self.title = "Quiz Section"
    wait(w)
    Function()
}

I tried sleep()

override func viewDidLoad()
{
    super.viewDidLoad()

    sleep(10)
    Function()
}

I even tried viewWillAppear but none of them seemed to work. I want that once the view is in front then the function executes. Any help?

NEVER use any kind of "sleep" on the main queue. Very, very bad. — rmaddy
– rmaddy, Commented May 3, 2018 at 21:25

Shehata Gamal · Accepted Answer · 2018-05-03 21:39:25Z

2

You can try viewDidAppear

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    function()    // don't start function name with capital 
 }

OR dispatch the function in after queue if you need more duration

override func viewDidLoad()
{
    super.viewDidLoad()

    let w = UnsafeMutablePointer<Int32>.allocate(capacity: 20)
    self.title = "Quiz Section"

     DispatchQueue.main.asyncAfter(deadline: .now() + 2.0 ) {
          function()  
     }

}

edited May 3, 2018 at 21:39

answered May 3, 2018 at 20:17

Shehata Gamal

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2 Comments

rmaddy Over a year ago

If this code is in viewDidAppear, there is no point at all to using asyncAfter.

Shehata Gamal Over a year ago

@rmaddy it's another option not both together

JaredH · Accepted Answer · 2018-05-03 20:53:56Z

0

Try this:

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    function()
}

answered May 3, 2018 at 20:53

JaredH

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