使用 prepareForSegue 传递数据

Question

我试图将数据从 viewController 1 传递到 viewController2，我有 2 个按钮和 1 个 segue（因此有一个 segue 标识符）用于这 2 个按钮，每个按钮按下时应该显示：1 个标签显示标题和 1 个文本视图显示定义，我无法显示每个单词自己的数据；我知道它必须是在 performSegueWithIdentifier 中引用 SENDER 的一些代码，但我不知道该怎么做。

感谢您的帮助！！！谢谢。

这是我的代码

class ViewController: UIViewController {

    @IBAction func AbstractionBtn(sender: AnyObject) {
        performSegueWithIdentifier("ShowDefinition", sender: "Abstraction")
    }

    @IBAction func binarySystemBtn(sender: AnyObject) {
        performSegueWithIdentifier("ShowDefinition", sender: "Binary System")

    }

 override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        if (segue.identifier == "ShowDefinition") {
            if let destinationViewController = segue.destinationViewController as? EnglishViewController {
                destinationViewController.titleMsg = "Abstraction"
                destinationViewController.definitionMsg = "Abstraction Definition"
            }
    } else if(segue.identifier == "ShowDefinition"){if let destinationViewController = segue.destinationViewController as? EnglishViewController {
            destinationViewController.titleMsg = "Binary System"
            destinationViewController.definitionMsg = "Binary System Definition"
            }
        }    
}

Answer 1

创建一个名为 titleMsg 和 definitionMsg 的变量。在每个 @IBAction 方法中，将适当的标题消息设置为 self.titleMsg 并且类似地设置为 self.definitionMsg.

那次通话之后，

performSegueWithIdentifier("ShowDefinition", sender: self)

然后覆盖，

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "ShowDefinition" {
        let destinationVC = segue.destinationViewController as? EnglishViewController
        destinationVC.titleMsg = self.titleMsg
        destinationVC.definitionMsg = self.definitionMsg
    }
}

希望对您有所帮助！

Answer 2

试试这个

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?)
{
    if (segue.identifier == "ShowDefinition")
    {
        if let destinationViewController = segue.destinationViewController as? EnglishViewController
        {
             var btn = sender as! UIButton
            if btn.tag == 1
            {
                destinationViewController.titleMsg = "Abstraction"
                destinationViewController.definitionMsg = "Abstraction Definition"
            }
            else
            {
                destinationViewController.titleMsg = "Binary System"
                destinationViewController.definitionMsg = "Binary System Definition"

            }

        }
    }
}

然后像这样设置按钮标签

AbstractionBtn.tag = 1
binarySystemBtn.tag = 2

现在像这样调用 segue

@IBAction func AbstractionBtn(sender: AnyObject) {
performSegueWithIdentifier("ShowDefinition", sender:sender)
}

Answer 3

您已在 performSegueWithIdentifier 的 sender 参数中将定义作为字符串正确传递。你只需要在 prepareForSegue 中使用它的值，但首先你必须从 AnyObject 中转换它？回到一个字符串。

您的代码可能类似于：

class ViewController: UIViewController {
    @IBAction func AbstractionBtn(sender: AnyObject) {
        performSegueWithIdentifier("ShowDefinition", sender: "Abstraction")
    }

    @IBAction func binarySystemBtn(sender: AnyObject) {
        performSegueWithIdentifier("ShowDefinition", sender: "Binary System")
    }

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        if (segue.identifier == "ShowDefinition") {
            if let destinationViewController = segue.destinationViewController as? EnglishViewController {
                if let definition = sender as? String {
                    if definition == "Abstraction" {
                        destinationViewController.titleMsg = "Abstraction"
                        destinationViewController.definitionMsg = "Abstraction Definition"
                    } else if definition == "Binary System" {
                        destinationViewController.titleMsg = "Binary System"
                        destinationViewController.definitionMsg = "Binary System Definition"
                    }
                }
            }
        }
    }
}

使用 prepareForSegue 传递数据

Pass data with prepareForSegue

sender

ios

swift

swift2