How to Add an Action to a Button Programmatically in Xcode

Swift add show action to button programmatically

You can go for below code

`

let btn: UIButton = UIButton(frame: CGRect(x: 100, y: 400, width: 100, height: 50))
btn.backgroundColor = UIColor.green
btn.setTitle("Click Me", for: .normal)
btn.addTarget(self, action: #selector(buttonAction), for: .touchUpInside)
btn.tag = 1
self.view.addSubview(btn)

for action

 @objc func buttonAction(sender: UIButton!) {
        let btnsendtag: UIButton = sender
        if btnsendtag.tag == 1 {

            dismiss(animated: true, completion: nil)
        }
    }

Adding button programmatically swift

Change with

playPauseButton.addTarget(self, action: #selector(playAction), for: .touchUpInside)

this is ok:

@objc
func playAction(sender: UIButton) {
      print("Hello")
}

works for me

How do I add a IBAction to a button programmatically in Swift 4?

Swift 4 version:

button.addTarget(self, action: #selector(action(sender:)), for: .touchUpInside)

@objc private func action(sender: Button) {
    print("test")
}

Make a UIButton programmatically in Swift

You're just missing the colon at the end of the selector name. Since pressed takes a parameter the colon must be there. Also your pressed function shouldn't be nested inside viewDidLoad.

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    let myFirstLabel = UILabel()
    let myFirstButton = UIButton()
    myFirstLabel.text = "I made a label on the screen #toogood4you"
    myFirstLabel.font = UIFont(name: "MarkerFelt-Thin", size: 45)
    myFirstLabel.textColor = .red
    myFirstLabel.textAlignment = .center
    myFirstLabel.numberOfLines = 5
    myFirstLabel.frame = CGRect(x: 15, y: 54, width: 300, height: 500)
    myFirstButton.setTitle("✸", for: .normal)
    myFirstButton.setTitleColor(.blue, for: .normal)
    myFirstButton.frame = CGRect(x: 15, y: -50, width: 300, height: 500)
    myFirstButton.addTarget(self, action: #selector(pressed), for: .touchUpInside)
}

@objc func pressed() {
    var alertView = UIAlertView()
    alertView.addButtonWithTitle("Ok")
    alertView.title = "title"
    alertView.message = "message"
    alertView.show()
}

EDIT: Updated to reflect best practices in Swift 2.2. #selector() should be used rather than a literal string which is deprecated.

How to create an IBAction for a button programmatically-created based on user input

use addTarget to bind an action to a method

func buttonClicked(sender: UIButton){
    print("button Clicked")
}

then add target to button

var button = UIButton()
button.addTarget(self, action: #selector(self.buttonClicked(sender:)), for: .touchUpInside)

How to trigger UIButton action programmatically

UIButton has a method to invoke the targets/selectors that are linked to a certain control event:

[button sendActionsForControlEvents:UIControlEventTouchUpInside];

2022 Swift syntax:

someButton.sendActions(for: .primaryActionTriggered)

How do I create a basic UIButton programmatically?

Here's one:

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button addTarget:self 
           action:@selector(aMethod:)
 forControlEvents:UIControlEventTouchUpInside];
[button setTitle:@"Show View" forState:UIControlStateNormal];
button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);
[view addSubview:button];