Assign two different UITapGestureRecognizer for a custom control using swift - ios

Question

using swift, I'm trying to create a dynamic and generic control to reuse it, basically, the control should have a general behavior inside.
To be more specific, I have a UIScrollView and it's filled using UIViews, when you click over an UIView, the background should change.
That is working correctly.
But, for the implementation, my class of the generic control, accepts a Selector as parameter.
Both works separately, but together are not working.
The specific part of codes are:
Generic class
let clickAgendaEvent = UITapGestureRecognizer(target: self, action: #selector (self.agendaClicked (_:)))
cellSubView.addGestureRecognizer(clickAgendaEvent)
cell.addSubview(cellSubView)
let itemClickedEvent = UITapGestureRecognizer(target: viewController.self, action: self.agendaItemClicked! )
cell.addGestureRecognizer(itemClickedEvent)
And a ViewController with an implementation like this:
#objc func eventDailyAgenda(sender:UIView!){
print("Item clicked!")
}
As you can see, the second event, is not inside of the generic class, the second event is a separated implementation if the ViewController.
But, the generic class, would be implemented for other UIViewController.
Someone have an idea about how can handle it?

Answer 1

Look into UIGestureRecognizerDelegate to handle both gestures simultaneously. Check out the callback gestureRecognizer(_:shouldRecognizeSimultaneouslyWith:) . Return true to have both handled simultaneously.

Answer 2

The easier way to do it, is implementing UIGestureRecognizerDelegate.
But for my specific case didn't work, because, I have different classes implementing the behavior.
But, I found a way to do it.
And is implementing NSObject (if you are in a UIViewController you don't have to implement it.
For my case I have my class:
class MyClass:NSObject {
func createAll(){
let clickAgendaEvent = UITapGestureRecognizer(target: self, action: #selector (self.agendaClicked (_:)))
cellSubView.addGestureRecognizer(clickAgendaEvent)
cellSubView.tag = index
cell.addSubview(cellSubView)
}
#objc func agendaClicked(_ sender:AnyObject) {
baseView.setTransparentToSubViews()
print("Here")
let tap = sender as! UITapGestureRecognizer
tap.view?.backgroundColor = UIColor().hexStringToUIColor(hex: "#e0e0e0")
if let v = tap.view {
// use button
print("The tag is \(v.tag)")
}
if let c: NSObject.Type = NSClassFromString(viewController.className) as? NSObject.Type{
let c_tmp = c.init()
c_tmp.perform(Selector(("test")))
c.perform(Selector(("static_test")))
}
}
}
Add in your ViewController
#objc public func test(){
print("This is Test!!!")
}
#objc public class func static_test(){
print("This is Static Test")
}
And this extension:
import Foundation
import UIKit
extension UIViewController {
var className: String {
return NSStringFromClass(self.classForCoder)
}
}
Now, you can execute all the methods you want.
For this case, once the user touch an element, the next event is fired from the touch, and not is necessary to add a new delegate.
Maybe is not the better way, but is totally functional.