Swift: Creating a button that calls a method in another class1
Assuming that you have a view controller where you create the Store
object - you should pass the button action back to this view controller and add a segue from it to your desired destination.
Best practice is to use a protocol that delegates the buttons action back up to the viewController that it is contained in as below.
Store.swift
protocol StoreDelegate: NSObject {
func didPressButton(button:UIButton)
}
class Store: UIView {
weak var delegate:StoreDelegate!
override init(frame:CGRect) {
super.init(frame:frame)
var button = UIButton()
button.setTitle("button", forState: .Normal)
button.addTarget(self, action: "buttonPress:", forControlEvents: .TouchUpInside)
self.addSubview(button)
}
func buttonPress(button:UIButton) {
delegate.didPressButton(button)
}
}
ViewController.swift
class ViewController: UIViewController, StoreDelegate {
override func viewDidLoad() {
super.viewDidLoad()
addStoreObj()
}
func addStoreObj() {
var store = Store()
store.delegate = self // IMPORTANT
self.view.addSubview(store)
}
func didPressButton(button:UIButton) {
self.performSegueWithIdentifier("ok", sender: nil)
}
}
This code is untested, but I hope you get the idea - your Store
object delegates the button press activity back to its containing ViewController
and then the ViewController carries out the segue that you have attached to it in the Storyboard.
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Omar Kayali
Updated on September 14, 2022Comments
-
Omar Kayali over 1 year
I have 2 classes, the first class is named "store" where I create a button which calls a method: "storeSelected" located in the second class with the name
ExploreViewController
.
The method should print "done" and take me to another view controller. Without the segue "done" is printed but when putting the segue code the app crashes.The error is:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Receiver (<Glam.ExploreViewController: 0x14ed3be20>) has no segue with identifier 'ok''
.........// ExploreViewController Class let _sharedMonitor: ExploreViewController = { ExploreViewController() }() class ExploreViewController: UIViewController, UIScrollViewDelegate { class func sharedMonitor() -> ExploreViewController { return _sharedMonitor } func storeSelected(sender: UIButton) { println("done") // it entered here and "done" is printed self.performSegueWithIdentifier("ok", sender: self) //here is the problem } } // another class named "Store" // button is created let monitor = ExploreViewController.sharedMonitor() btn.addTarget(monitor, action: Selector("storeSelected:"), forControlEvents: UIControlEvents.TouchUpInside)