ios - swift如何对按钮添加点击触发事件,我这样写没有用啊

Question

Answer 1

Swift versi yang manakah milik anda? Jika 2.2:

button.addTarget(self, action: #selector(buttonTapped), forControlEvents: .TouchUpInside)

Jika ia adalah versi sebelum 2.2:

button.addTarget(self, action: "buttonTapped:", forControlEvents: .TouchUpInside)

Saya belum menguji sintaks tertentu, tetapi ia sepatutnya lebih kurang seperti ini.

Answer 2

Rujuk kod berikut

import UIKit

class BaseViewController: UIViewController {

    let button = UIButton(frame: CGRect(x: 100, y: 150, width: 120, height: 50))
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        button.backgroundColor = UIColor.blueColor()
        button.setImage(UIImage(named: "2.jpg"), forState: .Highlighted)
        button.addTarget(self, action: #selector(buttonTapped(_:)), forControlEvents: .TouchUpInside)
        view.addSubview(button)
    }
    
    func buttonTapped(sender: UIButton) {
        print("hello")
    }

}