How to segue to view controller on panGesture

Question

I'm trying to segue to a view controller. the segue's identifier is "Orange" (the other view controller is just an orange view). The view controller is segued through storyboard and connected to an image view in my main view controller. I want to trigger this with a pan gesture recognizer. So when a pan is detected, it just segues to the view controller.

This is my attempt:

@IBOutlet var panGesture: UIPanGestureRecognizer!

@IBAction func onPan(sender: UIPanGestureRecognizer) {
    if panGesture.state == .Ended {
        print("panned")
    performSegueWithIdentifier("Orange", sender: sender)
    }
}

However, this is not working. I know it does detect the pan, but it doesn't perform the segue.

I read how to present the segue from IOS - How to segue programmatically using swift

`if panGesture.state == .Ended` is working? – Bista Aug 29 '16 at 11:26 — Bista, Aug 29 '16 at 11:26
@Mr.UB Yes, I get panned printed out. – Useful_Investigator Aug 29 '16 at 11:27 — Useful_Investigator, Aug 29 '16 at 11:27
where you register panGesture with the action onPan? – Abdul Rehman Aug 29 '16 at 11:28 — Abdul Rehman, Aug 29 '16 at 11:28
try putting `self` like `self.performSegue...`, wild guess. – Bista Aug 29 '16 at 11:29 — Bista, Aug 29 '16 at 11:29
self. performSegueWithIdentifier("Orange", sender: sender) – Abdul Rehman Aug 29 '16 at 11:29 — Abdul Rehman, Aug 29 '16 at 11:29
no luck @AbdulRehmanWarraich – Useful_Investigator Aug 29 '16 at 11:33 — Useful_Investigator, Aug 29 '16 at 11:33
Is your panGesture is working fine? – Abdul Rehman Aug 29 '16 at 11:38 — Abdul Rehman, Aug 29 '16 at 11:38
@AbdulRehmanWarraich yes – Useful_Investigator Aug 29 '16 at 11:41 — Useful_Investigator, Aug 29 '16 at 11:41

Dravidian · Accepted Answer · 2016-08-29T12:20:56.843

4

Try presenting ViewController's by instantiation: -

Make sure you have a navigation Controller embed in your First VC
Giving your ViewController a StoryBoardID :- Select the ViewController in your storyboard which you want to present -> Identity Inspector -> StoryBoard ID Give your VC a storyboard ID lets say : "vc2SceneVC_ID"

Instantiate and push the VC like this:-

@IBAction func onPan(sender: UIPanGestureRecognizer) {

if panGesture.state == .Ended {
print("panned")

 let vc2Scene = self.storyboard?.instantiateViewControllerWithIdentifier("vc2SceneVC_ID") as! VC2
 self.navigationController?.pushViewController(vc2Scene, animated: true)

}

Apple Documentation for Navigation Controller :- UINavigationController Apple Doc

PS:- Prefer instantiating the navigating through ViewControllers with instantiation rather performSegueWithIdentifier("Orange", sender: sender) Because this way you get to transfer data back-forth those viewControllers, also it prevents Memory Leaks in most cases.

edited Aug 29 '16 at 12:20

answered Aug 29 '16 at 11:33

Dravidian

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Thanks! that works, but any idea why I have to embed in a Navigation Controller? – Useful_Investigator Aug 29 '16 at 11:42
Navigation Controller is like a shuttle cock holder (open at both top and bottom) , you can push and pop a VC , but VC needs to know where it is in the index, basically A navigation controller will maintain the stack of view controllers. – Dravidian Aug 29 '16 at 11:49
@Marcel You don't have to use Navigation controller to do that – Abdul Rehman Aug 29 '16 at 11:53
@AbdulRehmanWarraich then how are you going to push or pop a VC from a view hierarchy? – Dravidian Aug 29 '16 at 11:57

score 2 · Answer 2 · answered Aug 29 '16 at 11:52

2

Step 1: Control+Click from the first ViewController (where is the View Controller lab is shown) and drag to the second ViewController

step 2 :select the type of segue

step 3:select the segue and set the identifier

and where you need to perform the segue just call self.performSegueWithIdentifier("test", sender: nil)

sorry for bad English

answered Aug 29 '16 at 11:52

Abdul Rehman

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In your case call the segue after print("panned") – Abdul Rehman Aug 29 '16 at 11:54
This is nothing different than what OP posted. Please read the question clearly before you post an answer.:) – Dravidian Aug 29 '16 at 12:06
@Dravidian Ok Thank's for your Correction. – Abdul Rehman Aug 29 '16 at 12:08

score 1 · Answer 3 · answered Aug 29 '16 at 11:31

1

Orange must be the identifier of your segue in the storyboard and not the view controller identifier.

If your segue identifier is set properly try testing if your gesture callback is in the main thread.

Let me know in the comments you have problems.

answered Aug 29 '16 at 11:31

Marco Santarossa

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Apologies for my bad wording, the Segue's identifier is "Orange" – Useful_Investigator Aug 29 '16 at 11:33
@Marcel try setting nil in the sender, or self – Marco Santarossa Aug 29 '16 at 11:38

How to segue to view controller on panGesture

3 Answers3