Question

我是菜鸟，所以如果这个问题很简单，请原谅我。

我创建了一个UIActionSheet，弹出多个选项，并根据用户选择的内容我想要更新动态标签。我知道如何制作标签，但我无法弄清楚我缺少什么来更新标签。任何人都可以帮我解决我应该添加的内容吗？

我的代码如下：

@IBAction func button(sender: UIButton) {

    let alertController = UIAlertController(title: "Title", message: "", preferredStyle: .ActionSheet)

    let oneAction = UIAlertAction(title: "A", style: .Default) { (_) in }
    let twoAction = UIAlertAction(title: "B", style: .Default) { (_) in }
    let threeAction = UIAlertAction(title: "C", style: .Default) { (_) in }

    let cancelAction = UIAlertAction(title: "Cancel", style: .Default) { (action) in
        // ...
    }

    alertController.addAction(oneAction)
    alertController.addAction(twoAction)

    alertController.addAction(cancelAction)




    self.presentViewController(alertController, animated: true) {
        }

Answer 1

只需更新处理程序中的标签即可。这样的事情。

let cancelAction = UIAlertAction(title: "Cancel", style: .Default) { (action) in
        // ...
    self.theLabel.text = "Cancel"
}

Answer 2

您可以在UIAlertAction：

中执行此操作

@IBAction func button(sender: UIButton)
{

    let alertController = UIAlertController(title: "Title", message: "", preferredStyle: .ActionSheet)

    let oneAction = UIAlertAction(title: "A", style: .Default) { (_) in
        // Update Label here
        yourLabel.text = "A"
    }

    let twoAction = UIAlertAction(title: "B", style: .Default) { (_) in
        // Update Label here
        yourLabel.text = "B"
    }

    let threeAction = UIAlertAction(title: "C", style: .Default) { (_) in
        // Update Label here
        yourLabel.text = "C"
    }

    let cancelAction = UIAlertAction(title: "Cancel", style: .Default) { (action) in
        // Update Label here
        yourLabel.text = "Cancel Clicked"
    }

    alertController.addAction(oneAction)
    alertController.addAction(twoAction)
    alertController.addAction(threeAction)
    alertController.addAction(cancelAction)

    self.presentViewController(alertController, animated: true) {
    }
}

如何使用UIActionSheet选项更新动态标签？

2 个答案: