我试图通过" show"将UIColor
传递给另一个viewController。 segue,以便背景的颜色可以与所选颜色按钮的颜色相匹配。我有一些代码打印按钮发送者标签,但它没有执行该segue。
我做错了什么?我之前从未使用发件人标签,所以它可能是愚蠢的但我不确定。
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "toQuiz" {
if sender?.tag == 1 {
let viewController:ViewController = segue.destinationViewController as! ViewController
let color = UIColor.blueColor()
viewController.passedColor = color
} else if sender!.tag == 2 {
let viewController:ViewController = segue.destinationViewController as! ViewController
let color = UIColor.greenColor()
viewController.passedColor = color
} else if sender!.tag == 3 {
let viewController:ViewController = segue.destinationViewController as! ViewController
let color = UIColor.yellowColor()
viewController.passedColor = color
}
}
}
@IBAction func athButtonTapped(sender: AnyObject) {
let athleteQuiz = sender as! UIButton
print("Button \(athleteQuiz.tag) was pressed!")
}
@IBAction func actorButtonTapped(sender: AnyObject) {
let actorQuiz = sender as! UIButton
print("Button \(actorQuiz.tag) was pressed!")
}
@IBAction func musicButtonTapped(sender: AnyObject) {
let musicQuiz = sender as! UIButton
print("Button \(musicQuiz.tag) was pressed!")
}
这是故事板布局 - 它们都正确连接,segue的标识符与故事板中的标识符匹配。
答案 0 :(得分:4)
要检查的一些事项:
performSegueWithIdentifier(_:sender:)
此外,这是一个非常危险的代码块;你不应该像那样强行打开发送者。相反,考虑做这样的事情:
guard let id = segue.identifier else { return } // Bail if there isn't a segue ID.
if id == "toQuiz" {
guard let tag = (sender as? UIView)?.tag else { return } // Bail if we can't get a tag.
// Continue examining the tag.
}