Question

在我正在创建的应用程序中，我有一个带有一些选项的ActionSheet。当用户选择一个选项时，我希望标签更改为他/她选择的内容。我尝试了一个if / else语句，但我显然没有正确创建它 -

@IBAction func showActionSheet(sender: AnyObject) {

    var optionMenu = UIAlertController(title: nil, message: "Choose a Factor", preferredStyle: .ActionSheet)


    let factorActionCageRest = UIAlertAction(title: "Cage Rest", style: .Default, handler: {
        (alert: UIAlertAction!) -> Void in
        print("File Deleted")
    })

    let factorActionAfterSurgery = UIAlertAction(title: "After Surgery", style: .Default, handler: {
        (alert: UIAlertAction!) -> Void in
        print("File Saved")
    })

    let factorActionTrauma = UIAlertAction(title: "Trauma", style: .Default, handler: {
        (alert: UIAlertAction!) -> Void in
        print("File Saved")
    })

    let factorActionSepsis = UIAlertAction(title: "Sepsis", style: .Default, handler: {
        (alert: UIAlertAction!) -> Void in
        print("File Saved")
    })

    let factorActionSevereBurn = UIAlertAction(title: "Severe Burn", style: .Default, handler: {
        (alert: UIAlertAction!) -> Void in
        print("File Saved")
    })

    let factorCancelAction = UIAlertAction(title: "Cancel", style: .Cancel, handler: {
        (alert: UIAlertAction!) -> Void in
        print("Cancelled")
    })


    optionMenu.addAction(factorActionCageRest)
    optionMenu.addAction(factorActionAfterSurgery)
    optionMenu.addAction(factorActionTrauma)
    optionMenu.addAction(factorActionSepsis)
    optionMenu.addAction(factorActionSevereBurn)
    optionMenu.addAction(factorCancelAction)

    if optionMenu.addAction() = factorActionCageRest {
        var factorActionOutput = 1.25
        factorLabel.text = "\(factorActionOutput)"
    }
    self.presentViewController(optionMenu, animated: true, completion: nil)

}

@IBOutlet weak var factorLabel: UILabel!
var factorActionOutput = Float()


}

问题 - 如何将if / else语句应用于用户的选项？谢谢！

Answer 1

当使用按钮时，会运行该操作的handler闭包。如果你想要发生某些事情，你需要在处理器内部添加代码，以便更好地实现它。

例如，按下此按钮时，您可以更改第一个操作以更改factorLabel的文本。

let factorActionCageRest = UIAlertAction(title: "Cage Rest", style: .Default, handler: { (alert: UIAlertAction!) -> Void in
    self.factorLabel.text = "File Deleted"
})

Answer 2

我知道您希望在用户选择选项时更改标签和变量。因此，您可以使用alertAction来更新标签

let factorActionCageRest = UIAlertAction(title: "Cage Rest", style: .Default, handler: {
    (alert: UIAlertAction!) -> Void in
        print("File Deleted")
        // Change the label and variable here
})

Answer 3

更新您的UIAlertAction处理程序以包含更改标签的代码。

let factorActionCageRest = UIAlertAction(title: "Cage Rest", style: .Default, handler: {
    [weak self] (alert: UIAlertAction!) -> Void in
    print("File Deleted")
    let factorActionOutput = 1.25
    self?.factorLabel.text = "\(factorActionOutput)"
})

如何在ActionSheet中使用if / else语句？

3 个答案: