我试图通过“show”segue 将 UIColor
传递给另一个 viewController,以便背景的颜色可以与所选颜色按钮的颜色相匹配。我有这段代码可以打印按钮发送者标签,但它没有执行该转场。
我做错了什么?我以前从未使用过发件人标签,因此这可能很愚蠢,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 Storyboard布局 - 它们都已正确连接,并且 Segue 的标识符与 Storyboard中的标识符相匹配。
最佳答案
一些需要检查的事情:
- 左 View Controller 是否在 IB 中分配了您的类?
- 是否有什么东西真正触发了segue?您的两个按钮操作都不包含对
performSegueWithIdentifier(_:sender:)
的调用
此外,这是一个非常危险的代码块;你不应该像那样强制解开发件人。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.
}
关于ios - 准备使用 Sender 在 Swift 中进行 Segue,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37420649/