Toggle Switch

If using more than one switch, make sure you give each a different number tag.
If you need to assign them to a sender function, for instance an event where value changed, assign all to the same function (same name). Delete all the additional events being created and change parameter type to UISwitch:
For instance, the following page has 6 switches:

@IBAction func warmUpHasChanged(_ sender: UISwitch) {
        print(sender.isOn)
        if sender.isOn
        {
            switch(sender.tag)
            {
            case 1 : self.warmUpHasTimer = true
            case 2: self.upperBodyHasTimer = true
            case 3: self.coreHasTimer = true
            case 4: self.lowerBodyHasTimer = true
            case 5: self.danceHasTimer = true
            default: self.coolDownHasTimer = true
                
            }
        }
        else
        {
            switch(sender.tag)
            {
            case 1 : self.warmUpHasTimer = false
            case 2: self.upperBodyHasTimer = false
            case 3: self.coreHasTimer = false
            case 4: self.lowerBodyHasTimer = false
            case 5: self.danceHasTimer = false
            default: self.coolDownHasTimer = false
                
            }
        }
        

    }

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