Xcode中的Control-drag给出了出口，但是UIButton没有动作。 为什么？

Question

In my app I'm building, I've got a Navigation Controller with a View Controller connected as a subview (is that the right word?). I added a UIButton and tried to Control-drag it into my view controller class file, but it's only giving me Outlet and Outlet collection as my options, not Action.

Screenshot of what I'm seeing

It's a pretty simple app, and I've tried removing my Pods as a fix, but so far no luck.

I've also tried manually writing the function and trying to connect it back to the button, but to no avail. Dragging back to the button in the workspace doesn't work, and the function isn't firing when I test the app. Here's the code I tried:

@IBAction func tapSaveButton(_ sender: UIButton) {}

It's probably something simple, so what am I missing here?

EDIT: Also, here's how I'm set up. I have a Navigation Controller with a UINavigationItem that shows a sub ViewController. The button in question is in the sub ViewController and I setup a new swift file to handle that ViewController's class. I'm trying to connect that button into that class file, and that's where it's not working.

Screenshot of my storyboard

Here's my ViewController class's code:

import Foundation
import UIKit
import KeychainSwift


class SettingsViewController : UIViewController {

    let keychain = KeychainSwift()

    @IBOutlet weak var APIKeyField: UITextField!
    @IBOutlet weak var WebSocketIPField: UITextField!
    @IBOutlet weak var SettingsSaveButton: UIButton!

    override func viewDidAppear(_ animated: Bool)  {
        super.viewDidAppear(animated)

        /* My other code, not related */
    }

    @IBAction func tapSaveButton(_ sender: UIButton) {

        // My button actions here.

    }

}

Answer 1

Of course it was something dumb. I removed the class from the button, and viola, it let me create an action in my Swift file.

Answer 2

也许您尝试连接到其他ViewController，请再次检查它是否正确并正确连接到Storyboard上

Answer 3

Right click on the uibutton within storyboard, you should see a list of action options under "Sent Events" the most common one to use is "Touch Up Inside".

Drag from the one you want (circle to the side) onto your view controller and everything should work fine.

EDIT: For clarity, you can even drag from "Touch Up Inside" to the func you've already created so long as it's labeled

@IBAction ...

which your code already has done.

Answer 4

当我在项目中添加本地化时，也发生了这种情况。从那时开始，在本地化中添加了情节提要，情节提要按钮不显示任何操作选项，仅显示插座选项。