How to dismiss viewController in ios using Swift

Question

I have a viewController which contains only an imageview. I want to present it whenever there is a loading in the application like fetching data from a webservice. So I have created a function in my loaderViewController as

func showLoading(viewController:UIViewController) {
    viewController.presentViewController(LoadingViewController(), animated: false, completion: nil)
}

This is working as expected, when I call this function when desired like below

var loader = LoadingViewController()
loader.showLoading(self)

It show me the viewController with image.

But Now want to dismiss this viewController when desired but I am not able to do so, This is what I have tried so far, I created another function in my LoaderViewController as

func dismissLoader() {
    let load = LoadingViewController()
    load.dismissViewControllerAnimated(true) {
        print("Dismissing Loader view Controller")
    }
}

But its not working and the viewController is not disappering from the screen.

Please guide me

Are YASLoadingViewController and LoadingViewController same?? — Vishal Sonawane
– Vishal Sonawane, Commented Aug 12, 2016 at 10:57

Luca D'Alberti · Accepted Answer · 2016-08-12 11:53:44Z

12

You don't have to create a new instance of your loader and call dismissViewControllerAnimated(_:Bool) on it.

Just call

self.dismissViewControllerAnimated(true)

on your viewController

So, your function will be

func dismissLoader() {

    dismissViewControllerAnimated(true) {
        print("Dismissing Loader view Controller")
    }
}

edited Aug 12, 2016 at 11:53

answered Aug 12, 2016 at 10:50

Luca D'Alberti

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1 Comment

Byte Over a year ago

can you rewrite the dismissLoader function for me please ?

Kushal Shrestha · Accepted Answer · 2017-07-12 08:00:03Z

5

In Swift 3 you can do following.

self.dismiss(animated: true)

answered Jul 12, 2017 at 8:00

Kushal Shrestha

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Comments

Lu_ · Accepted Answer · 2016-08-12 10:49:48Z

1

do not make let load = YASLoadingViewController() everytime, you are creating different controller Do it once and then use only load to dismiss or present

answered Aug 12, 2016 at 10:49

Lu_

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2 Comments

Byte Over a year ago

is this an answer ?

Yury Over a year ago

Your answers are often right, but if you will provide more wide explanation they will be really useful. I think askers often are not qualified enough for understand your short answers

Chirag Patel · Accepted Answer · 2016-08-12 10:55:38Z

1

self.dismissViewControllerAnimated(false, completion: nil)

answered Aug 12, 2016 at 10:55

Chirag Patel

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Comments

Rukshan · Accepted Answer · 2016-08-12 11:29:40Z

1

Your code has many flaws. The way you trying to achieve this is not a good practice. However ,If you want a quick fix, and just want to modify your existing method do this,

func dismissLoader() {
    self.dismissViewControllerAnimated(true) 
    print("Dismissing Loader view Controller")
}

And when you're presenting a new LoadingViewController , keep a reference to it, so you can call above method.

Anyways, above code should work even without you holding a reference, since iOS delegate this method back to it's parent ViewController of it's hierarchy, if there's no presented ViewController available on the called ViewController.

edited Aug 12, 2016 at 11:29

answered Aug 12, 2016 at 11:18

Rukshan

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Comments

danshevluk · Accepted Answer · 2017-01-26 18:04:14Z

1

You have to store a link for LoadingViewController in parent view controller:

var loader: LoadingViewController?

func showLoadingIn(viewController: UIViewController) {
   loader = LoadingViewController() // create new instance before presentation
   viewController.presentViewController(loader!, animated: false, completion: nil)
}

func dismissLoader() {
    loader?.dismissViewControllerAnimated(true) {
        print("Dismissing Loader view Controller") 
    }
}

edited Jan 26, 2017 at 18:04

answered Aug 12, 2016 at 11:38

danshevluk

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