ios - Swift - 以编程方式创建的 UIButton 不会触发触摸事件

Question

我已经以编程方式创建了一个按钮，并且想要添加一个触摸事件处理程序。我已经尝试了网上找到的所有技巧，但所需的功能从未被触发。

upgradeNowView = UIButton()
upgradeNowView.setTitle("Upgrade", forState: .Normal)
upgradeNowView.contentMode = UIViewContentMode.ScaleToFill
upgradeNowView.frame = CGRect(x: upgradeNowView.frame.minX, y: -50 , width: 320, height: 50)
upgradeNowView.userInteractionEnabled = true
upgradeNowView.sendActionsForControlEvents(.TouchUpInside)
upgradeNowView.addTarget(self, action: #selector(MainViewContainer.upgradeTapped(_:)), forControlEvents: .TouchUpInside)
side_menu_controller?.view.addSubview(upgradeNowView)

并定义了这个

func upgradeTapped(sender: UIButton)
{
    UpgradeViewController.openUpgrade()
}

但这永远不会被调用。任何帮助将不胜感激。

Answer 1

您需要在 side_menu_controller 实例的类中定义 upgradeTapped 函数。我猜，它是 SideMenuController 类。