"Unrecognized Selector Sent to Instance" in Swift

Thread 1: Exception:unrecognized selector sent to instance 0x7fb12cc088c0 exception error

This can happen if you add a selector (a function connected to an event) through the storyboard and then change it in code, resulting in the storyboard being out of sync.

Assuming you're trying to connect buttonAction(sender:UIButton) with your recordButton, try doing this:

1. Mark your function as @IBAction. (maybe you deleted this by mistake after connecting it to the storyboard?) @IBAction func buttonAction(sender: UIButton)
2. Go to the storyboard and delete the existing connection by going to the connections inspector after selecting the button and then deleting any connections (in my screenshot, I would click the x next to View Controller / Your Function):

3. Reconnect the function to the button by dragging the circle next to the event you want to connect to and and dropping over your view controller, and then selecting your buttonAction function.

If this doesn't work try providing some screenshots of your storyboard connections, I'll try to help out more!

Unrecognized selector sent to instance 0x7fecc7011000 In Swift

The problem is this outlet:

IBOutlet weak var tableView: UITableView!

You have hooked it up in the storyboard to the wrong object. It is hooked to the cell, not the table view. It looks like you must have hooked it up and then changed the class of the thing it is hooked to.

Swift unrecognized selector sent to instance error

Two changes for Swift 3:

The selector should look like:

#selector(ClassName.followButtonClick(_:))

The function should have an underscore:

@IBAction func followButtonClick(_ sender: UIButton!) { ...

Notice that these two should be in the same class, otherwise, make sure you initialize the ClassName class.

If you want the selector method(followButtonClick(_:)) to be in the UITableViewCell class. Remove @IBAction(I don't think you need it there):

func followButtonClick(_ sender: UIButton!) { ... 

Swift 4: Unrecognized selector sent to instance when calling a function inside another class

There's no reference to your LoginFunctions from your ViewController. And you pass self as the target to the button but self doesn't have a handleLogin method.

You need to hold and instance of LoginFunctions in your ViewController class. Then pass that reference as the target instead of self.

class ViewController: UIViewController {
    let functions = LoginFunctions()

    lazy var loginRegisterButton: UIButton = {
        let button = UIButton(type: .system)
        button.backgroundColor = Color.darkBlue
        button.setTitle("Register", for: .normal)
        button.translatesAutoresizingMaskIntoConstraints = false
        button.setTitleColor(UIColor.white, for: .normal)
        button.layer.cornerRadius = 5
        button.titleLabel?.font = UIFont.boldSystemFont(ofSize: 16)

        button.addTarget(functions, action: #selector(LoginFunctions.handleLogin), for: .touchUpInside)

        return button
    }()
}

unrecognized selector sent to instance 0x7ff0ece07a40 ERROR on xcode

I am quite sure the problem is with my code and not with any connections in the storyboard.

No, the problem is indeed a connection. According to a suggestion in your previous question you renamed Hint to hintButton which does not rename the connection automatically.

In the storyboard delete the dead Hint connection and reconnect it to hintButton.

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