Swift 如何将按钮标题传递给下一个视图控制器

Question

我在 viewDidLoad 的循环中定义了几个按钮。它们位于滚动视图中的内容视图中。

    for var i:Int = 0; i < colleges.count; i++ {

        let collegeButton = UIButton.buttonWithType(UIButtonType.System) as UIButton
        collegeButton.frame = CGRectMake(0, 0, self.contentView.frame.size.width, 30)
        collegeButton.center = CGPoint(x: self.contentView.center.x, y: 30 * CGFloat(i) + 30)
        collegeButton.setTitle(sortedColleges[i], forState: UIControlState.Normal)
        collegeButton.setTitleColor(UIColor.darkGrayColor(), forState: UIControlState.Normal)
        collegeButton.titleLabel?.font = UIFont(name: "Hiragino Kaku Gothic ProN", size: 15)
        collegeButton.addTarget(self, action: "collegeSelected:", forControlEvents: UIControlEvents.TouchUpInside)
        self.contentView.addSubview(collegeButton)
    }

如您所见，每个按钮的标题都是根据先前定义的字符串数组设置的。 Whenever a button is selected, a segue is called to move to a table view, which is embedded in a navigation controller.

我需要将导航控制器标题设置为与特定按钮标题相同。

以下是我尝试过的一些方法：

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    var destViewController:videosTableView = segue.destinationViewController as videosTableView
    //destViewController.title = collegeButton.titleLabel?.text

    //var buttonTitle = sender.titleLabel?.text
    //destViewController.title = buttonTitle
}

注释行是失败的尝试。

我还尝试在按下按钮时调用的动作函数中工作：

func collegeSelected(sender: UIButton!) {

    self.performSegueWithIdentifier("goToTableView", sender: self)

    //Set navigation title of next screen to title of button
    var buttonTitle = sender.titleLabel?.text
    println(buttonTitle)

}

使用发送器获取按钮标题有效，但我不知道如何将它传递给下一个视图控制器。

非常感谢任何能提供帮助的人。

Answer 1

在您的按钮函数中，将按钮作为 segue 的发送者传递：

func collegeSelected(sender: UIButton!) {
    self.performSegueWithIdentifier("goToTableView", sender: sender)
}

然后在prepareForSegue中，从发送者处获取按钮标题（即按钮）：

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    let destViewController = segue.destinationViewController as videosTableView

    if let buttonTitle = (sender as? UIButton)?.titleLabel?.text {
        destViewController.title = buttonTitle
    }
}

Swift 如何将按钮标题传递给下一个视图控制器

How to pass button title to next view controller in Swift

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