Passing variable to another view controller

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1

Hoping someone can lead me to finding a solution on passing a variable to another view controller.

Here is the situation:

I have “log in” and “get device” in my first view controller. No problem with logging in and accessing my device from the cloud. I also have a button that takes me to my second view controller with no issues. There are six switches designed to turn relays on and off in the second controller. I also understand how to program the switches.

I’m assuming I need to create another instance of “device” in the second controller to call functions. I already successfully designed the firmware housing the functions I need to call, and they successfully compiled and flashed my device.

I believe I need to use the prepare for Segue function in the primary controller and design a variable in the second controller to house what I pass from the primary controller. That said, I don’t know what “type” the variable should be. I named the variable myPhoton2 in the second controller.

Here is the prepare for Segue function I started:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

    var secondviewController: CoopControlViewController = segue.destinationViewController as! CoopControlViewController
    secondviewController.myPhoton2 =

I sure would appreciate some guidance.

2

You probably shouldn’t be creating another instance of your device in the second controller. If you only have one device, you should only have one instance. You should pass a reference that points to your photon in the first controller to the second one. Something like,

secondviewController.myPhoton2 = myPhoton1

The type of myPhoton2 would be the same as what myPhoton1 is.

3

Thanks Ric so if I setup the prepare for segue like this:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

    var secondviewController: CoopControlViewController = segue.destinationViewController as! CoopControlViewController
    secondviewController.myPhoton2 = self.myPhoton1

}

and myPhoton1 is derived from statement: self.device = myPhoton1

what would the “type” be for myPhoton2 in the second viewController

var myPhoton2 = “Type”

Thank you!

4

I’m not sure, since I use my own iOS code, and not any of the classes in The Particle app. You must already have a type for self.device though, right? How is ‘device’ declared?

5

Thanks you Ric, I figured it out

var myPhoton2 = SparkDevice?()

6

That will create a new instance. You want,

var myPhoton2: SparkDevice!

7

Ah I see, thank you Ric, I leaned something here.