swift add switch programmatically in side menu - ios

Question

Im trying to style my side menu, I want the UISwitch to edit the label next to it. But the only think that happens when I click on the switch is that the app crashes and I receives following error message
2016-08-20 01:56:20.545 Moppio[4342:8394913] -[Moppio.BackTableViewController test()]: unrecognized selector sent to instance 0x7fe66a4ba530
2016-08-20 01:56:20.554 Moppio[4342:8394913] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[Moppio.BackTableViewController test()]: unrecognized selector sent to instance 0x7fe66a4ba530'
* First throw call stack: ...
And this is the code that I use right now.
//Profile picture + bar
override func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView?{
let view = UIView(frame: CGRectMake(0, 0, tableView.bounds.size.width, 60))
view.backgroundColor = UIColor(red:0.40, green:0.40, blue:0.40, alpha:1.0)
let profileImageView = UIImageView(frame: CGRectMake(20, 5, 50, 50)) // Change frame size according to you...
profileImageView.image = UIImage(named: "profile.png") //Image set your
view.addSubview(profileImageView)
let LabelStatus = UILabel(frame: CGRectMake(0, 0, 200, 21))
LabelStatus.center = CGPointMake(120, 32)
LabelStatus.textColor = UIColor(red:0.95, green:0.95, blue:0.95, alpha:1.0)
LabelStatus.font = UIFont(name: "BebasNeue", size: 24)
LabelStatus.textAlignment = NSTextAlignment.Center
self.view.addSubview(LabelStatus)
let switchStatus=UISwitch(frame:CGRectMake(195, 15, 20, 20))
func test() {
if (switchStatus.on == true){
LabelStatus.text = ("Available")
print("on")
}
if (switchStatus.on == false){
LabelStatus.text = ("Not available")
LabelStatus.center = CGPointMake(130, 32)
print("off")
}
}
switchStatus.on = true
switchStatus.setOn(true, animated: false);
switchStatus.addTarget(self, action: "test()", forControlEvents: UIControlEvents.ValueChanged)
switchStatus.onTintColor = UIColor(red:0.95, green:0.95, blue:0.95, alpha:1.0)
switchStatus.thumbTintColor = UIColor(red:0.25, green:0.25, blue:0.25, alpha:1.0)
self.view.addSubview(switchStatus);
return view
}
And this is what it currently looks like.
How can I make the switch edit the label next to it?

Answer 1

You are getting the 'unrecognized selector' error because you are incorrectly targeting the test function.
In this line
switchStatus.addTarget(self, action: "test()", forControlEvents: UIControlEvents.ValueChanged)
You are trying to find a function test on self, but test is a function within the table view's viewForHeaderInSection function, not a function on self.
Additionally, the selector syntax has changed from a String to the new #selector syntax.
To fix this, move the test function to be a function on self. You will also need to be able to reference your switchStatus and LabelStatus objects, so you could move these to be declared as members of your view controller as well.
So at the end you should end up with something like this:
class BackTableViewController: UITableViewController {
let LabelStatus = UILabel()
let switchStatus = UISwitch()
func test() {
// update the label here
}
override func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView?{
// ...
switchStatus.addTarget(self, action: #selector(BackTableViewController.test), forControlEvents: UIControlEvents.ValueChanged)
// ...
}
}

Answer 2

Change that line of code, your syntax for the selector is not correct:
switchStatus.addTarget(self, action: #selector(BackTableViewController.test), forControlEvents: UIControlEvents.ValueChanged)