Fatal error: unexpectedly found nil while unwrapping an Optional value In Container View in iOS

Question

I am new to iOS and currently I am working with container view using tutorial https://kodesnippets.wordpress.com/2015/08/11/container-view-in-ios/

And I want to add one functionality i.e. in Second View Controller I want to add a button and then on click of that button I want to open Third View Controller in the same container view that lies under ViewController.swift.

Now, problem is that when I click on Button in Second View Controller then It shows me fatal exception that I have mentioned in question.

Code for Second View Controller on button's Touch Up Inside

  @IBAction func send(_ sender: UIButton) {

    container!.segueIdentifierReceivedFromParent("Third")

}

Please help if anyone knows.

you might have re added IBOutlet, Right click on your button see if there are multiple outlsets are present or not. — Devang Tandel, Oct 28 '17 at 10:38
Tell me am I right is it possible to do the same @Dev_Tandel — Android Developer, Oct 28 '17 at 10:39
I do not have any outlset just have one send event i.e. touch up inside @Dev_Tandel — Android Developer, Oct 28 '17 at 10:40
I mean do using this approach what I am doing.. Is I will be able to achieve the same that I had explained in my question @Dev_Tandel — Android Developer, Oct 28 '17 at 10:42
Check for the identifier of segue "Third" They are case sensitive — Devang Tandel, Oct 28 '17 at 10:43
Yes I checked. I wrote "Third" perfectly but my one question is that I have connected the same container view to third view controller @Dev_Tandel — Android Developer, Oct 28 '17 at 10:45
http://prntscr.com/h32n99 check this scrernshot of my storyboard @Dev_Tandel — Android Developer, Oct 28 '17 at 10:48
Did you check the code example here? https://github.com/iaaqib/ContainerView — Aaqib Hussain, Oct 28 '17 at 11:10
I think the transition you're trying to do is wrong i.e. going to ThirdViewController from Second.You'll need to switch the controllers using the ViewController and not the SecondViewController. — Aaqib Hussain, Oct 28 '17 at 11:14
container?.segueIdentifierReceivedFromParent("Third") Try this — Sumit singh, Oct 28 '17 at 11:49
I wouldn't rely on this tutorial. In fact, it's not about the container view in iOS, it's about the [containment API](https://developer.apple.com/library/content/featuredarticles/ViewControllerPGforiPhoneOS/ImplementingaContainerViewController.html). The title is totally misleading. What's more, it shows horrible use case of the custom segues and doesn't say a word about containment API which really powers up this solution. — Kamil Szostakowski, Oct 29 '17 at 12:37

score 1 · Answer 1 · answered Oct 28 '17 at 13:00

1

I have pushed a new Storyboard with name Secondary.storyboard, with your requirement added. Give it a try. See the attached image.

https://github.com/iaaqib/ContainerView

answered Oct 28 '17 at 13:00

Aaqib Hussain

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If I am adding one more button in second view controller and then code in view controller and second view controller it throws me an error i.e. http://prntscr.com/h3tp9h – Android Developer Oct 30 '17 at 10:25
Show your code? – Aaqib Hussain Oct 30 '17 at 16:48
https://drive.google.com/file/d/0B3bn04yG6nn7b0x4SnU5ZWJ5eUk/view?usp=sharing This is my code. Please check this. – Android Developer Oct 31 '17 at 09:54
Can you please tell me why I am not able to go to next view controller. My document is here https://drive.google.com/file/d/0B3bn04yG6nn7b0x4SnU5ZWJ5eUk/view?usp=sharing – Android Developer Nov 01 '17 at 07:29
To be honest this is not how container view is supposed to be used and your question is really hard to understand. Although I gave a pretty good example above. I'm not sure what you're doing wrong now, without seeing your project. – Aaqib Hussain Nov 01 '17 at 16:39
I can mail you my project. If you want – Android Developer Nov 02 '17 at 06:36

Fatal error: unexpectedly found nil while unwrapping an Optional value In Container View in iOS

1 Answers1