将按钮标签传递给另一个活动中的字符串

Aryam Saleh 发表于 Dev

阿里亚姆·萨利赫（Aryam Saleh）

我的代码运行没有任何错误，但没有将按钮的标签传递给下一个活动

这是代码

class SecondViewController: UIViewController {

    @IBOutlet weak var Properties: UIButton!
    @IBOutlet weak var games: UIButton!
    @IBOutlet weak var electronics: UIButton!
    @IBOutlet weak var Vehicles: UIButton!
    @IBOutlet weak var Accessories: UIButton!

    @IBOutlet weak var searchTitle: UISearchBar?

    override func viewDidLoad() {
        super.viewDidLoad()


        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        var pass:searchResultView = segue.destinationViewController as! searchResultView
        if(electronics.selected){
            if(searchTitle?.text != nil){
                pass.tit = searchTitle?.text
            }
        pass.received = electronics.titleLabel!.text!
        }
        else if(games.selected){
            if(searchTitle?.text != nil){
                pass.tit = searchTitle?.text
            }
            pass.received = games.titleLabel!.text!
        }
        else if(Properties.selected){
            if(searchTitle?.text != nil){
                pass.tit = searchTitle?.text
            }
            pass.received = Properties.titleLabel!.text!
        }
        else if(Vehicles.selected){
            if(searchTitle?.text != nil){
                pass.tit = searchTitle?.text
            }
            pass.received = Vehicles.titleLabel!.text!
        }
        else if(Accessories.selected){
            if(searchTitle?.text != nil){
                pass.tit = searchTitle?.text
            }
            pass.received = Accessories.titleLabel!.text!
        }
    }

当我尝试在其他活动中打印字符串时，它不打印任何内容

这是其他活动的代码

class searchResultView: UIViewController {

    var received:String = ""
    var tit:String? = nil

    override func viewDidLoad() {
        super.viewDidLoad()
        println(received)
        println(tit)

        println("jsoidjf")
        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

请任何人能帮助我，迷路了！

luk2302

你有两个选择

1.设置segue的标识符

您需要在“界面生成器”中设置标记的标识符，以检测触发了哪个标记：

单击您要为其设置标识符的segue
在左侧，您将获得突出显示segues起源的按钮
在右侧选择Attributes Inspector并键入一个标识符

在此处输入图片说明

然后将代码相应地更改为：

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    var pass:searchResultView = segue.destinationViewController as! searchResultView
    if (segue.identifier == "electronicsSegue") { 
    /* choose the same identifier as in the attribute inspector */
        if(searchTitle?.text != nil){
            pass.tit = searchTitle?.text
        }
        pass.received = electronics.titleLabel!.text!
    }
}

2.检查发送者对象

此版本更易于执行，但不太干净，请检查触发的segue的发送者是否等于您的按钮之一：

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    var pass:searchResultView = segue.destinationViewController as! searchResultView
    let senderButton = sender as! UIButton

    if(senderButton == electronics){
        if(searchTitle?.text != nil){
            pass.tit = searchTitle?.text
        }
        pass.received = electronics.titleLabel!.text!
    }
}

两种解决方案输出