Uibutton Causing Unrecognized Selector Sent to Instance

UIButton causing unrecognized selector sent to instance

Your Selector(("buttonAction:")) might be the cause of your problem.

Try #selector(buttonAction(sender:)) instead.

Unrecognized selector sent to instance error when pressing UIButton in Xcode 8/Swift 3

It seems like you have rename your IBAction method name earlier it was different and it is connected to the previous name inside your storyboard. So just disconnect your action method and reconnect it appropriately.

Unrecognized selector sent to instance in UIButton

One problem is that you are forcing manual formation of the Objective-C selector, and you don't actually know how to form an Objective-C selector manually so you are getting it wrong. Don't do that! Let the compiler form the selector for you. That's its job. Replace

action: Selector(("deleteUser"))

with

action: #selector(deleteUser)

Also, you need to expose your deleteUser method to Objective-C explicitly:

@objc func deleteUser(_ sender: UIButton) {

Otherwise Objective-C still won't be able to introspect your class and find this method when the time comes to call it. Fortunately, when you switch to #selector syntax, the compiler will call out that issue for you!

Swift Customized UIButton unrecognized selector sent to instance

If you'd share the FULL error message, you should have:

-[TheClass tapAction:] unrecognized selector sent to instance

Where TheClass should be the class of the instance that called tapInside(target:action:).

That's what might give you a tip on your issue.

Ie, TheClass is calling on itself the method tapAction(_:), which is doesn't' know.
It's like writing theClass.tapAction(someSender), this shouldn't compile, right?

The issue, is that in addTarget(_:action:for:), the target is the one that implement the action (selector). In this case, it's self, the BaseButton instance.

So:

self.addTarget(target, action: #selector(tapAction(_:)), for: .touchUpInside)

=>

self.addTarget(self, action: #selector(tapAction(_:)), for: .touchUpInside)

Now, since you don't need anymore the target parameter, you can remove it from the method:

public func tapInside(target: Any?, action: ((UIButton)->())?) {...}

=>

public func tapInside(action: ((UIButton)->())?) {...}

UIButton unrecognized selector sent to instance

Try this 
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellId", for: indexPath) as! ClinicListCell
    cell.title.text = clinicNames[indexPath.row]
    cell.subTitle.text = clinicSubs[indexPath.row]
    cell.backgroundImageView.image = UIImage(named: clinicImages[indexPath.row])
    cell.profileBtn.tag = indexPath.row
    cell.profileBtn.addTarget(self, action: #selector(YourViewController.profileBtnClicked(sender:)), for: UIControlEvents.touchUpInside)
    return cell
}

class func profileBtnClicked(sender:UIButton) {
    print("Selected")
}

UIButton unrecognized selector sent to instance when using code in new ViewController

Well, I still don't know exactly what caused this issue but a desperate attempt to fix it resulted in me updating to Swift 3 from 2.3, fixed the issue immediately.

UIButton in table cell unrecognized selector sent to instance

Seems like the problem is about forwardPress, not forwardButton nor cellButtonPress. Did you check the Outlet Inspector in the Interface Builder?

On some interface element (maybe the cell when reading the debugger), you may have an outlet not linked in code called forwardPress. You perform the action on the element, IB looks for the forwardPress method, which does not exist => crash.

UIButton creating error - unrecognized selector sent to instance

You should modify addTarget:

button.addTarget(self, action:Selector("buttonAction:"), forControlEvents: UIControlEvents.TouchUpInside)

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