[UIButton setText:]: unrecognized selector sent to instance - ios

Question

I have read several answers on this question but can't seem to find one that applies to my code. When I assign the "text" member of "myLabel" (below) I get: "[UIButton setText:]: unrecognized selector sent to instance...." The program compiles OK but then crashes when the assignment statement is encountered.
However I am able to assign and even print out the backgroundColor of the same object. Any ideas on what I am doing wrong?
//********
import UIKit
class ViewController: UIViewController {
//********* Button 1 *********//
#IBOutlet weak var lbl1: UILabel!
#IBAction func btn1(sender: AnyObject) {
nextColorFor1++
makeColor (self.lbl1, nextColor: nextColor1)
}
//**** Button 2 **********//
#IBOutlet weak var lbl2: UILabel!
#IBAction func btn2(sender: AnyObject) {
nextColorFor2++
makeColor (self.lbl2, nextColor: nextColorFor2)
}
//***************************//
func makeColor (myLabel:UILabel, nextColor:Int)
{
switch nextColor
{
case 0: myLabel.backgroundColor = UIColor(red: 0.1, green: 0, blue: 0, alpha: 0.1)
case 1: myLabel.backgroundColor = UIColor(red: 0.2, green: 0, blue: 0, alpha: 0.2)
case 2: myLabel.backgroundColor = UIColor(red: 0.3, green: 0, blue: 0, alpha: 0.3)
case 3: myLabel.backgroundColor = UIColor(red: 0.4, green: 0, blue: 0, alpha: 0.4)
case 4: myLabel.backgroundColor = UIColor(red: 0.5, green: 0, blue: 0, alpha: 0.5)
default: print("end of colors")
}
print(myLabel.backgroundColor)
myLabel.text = "4" <<< --- This is where the crask occurs
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
}

Answer 1

It seems like you have connected the UIButton(which is on your storyboard or xib) as as UILabel in the code, and you are trying to treat it as label. Make sure to replace the button on the IB to label, and it will work.

Answer 2

Don't pass the local variable
func makeColor()
{
myLabel.backgroundColor = UIColor(red: 0.1, green: 0, blue: 0, alpha: 0.1)
print(myLabel.backgroundColor)
myLabel.text = "4"
}
#IBAction func myButton(sender: AnyObject) {
makeColor ()
}
Now If you want to set the title for button
#IBOutlet var myButton: UIButton!
#IBAction func myButton(sender: AnyObject)
{
myButton.backgroundColor = UIColor(red: 0.1, green: 0, blue: 0, alpha: 0.1)
myButton.titleLabel?.text = "4"
}

Answer 3

try this to ease the bug in case the origin (xib || storyboard) is unknown
extension UIButton
{
func setText(_ text: String) {
assertionFailure("crashlytics reported Fatal Exception: NSInvalidArgumentException -[UIButton setText:]: unrecognized selector sent to instance 0xyyy objc_exception_throw keyboard_arrow_down")
titleLabel?.text = text
}
}