iphone - Swift:我需要获取 UIVIew 集合之一的索引才能知道哪个集合被点击

Question

我需要获取 UIView 集合之一的索引，以了解哪个集合被点击，然后链接到下一个屏幕中相应的数组元素。问题似乎是 sender! 我收到了错误消息:

Could not cast value of type 'UITapGestureRecognizer' (0x107dcdc20) to 'UIView' (0x107dc2578).

(我使用 UIView 创建彩色图 block 。我应该使用标签或按钮而不是 UIView 吗？)

import UIKit

class ColoringViewController: UIViewController {

var coloringItem: ColoringItem?
var colorListTileArray = [UIView]()

@IBOutlet var colorListTile: [UIView]!   // UIView color tiles 


override func viewDidLoad() {
   super.viewDidLoad()

   if coloringItem != nil {
        for (var i = 0; i<colorListTile.count; i++) {

            colorListTileArray += [colorListTile[i]]

        }
    }

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}


override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

    if segue.identifier == "showColoringDescriptionSegue" {

        let tappedTile = sender!.self     //<- doesn't work 
        //let tappedTile = sender!.view as! UIView <- doesn't work either :(
        let colorIndex = colorListTileArray.indexOf(tappedTile as! UIView)

        print(colorIndex)
    }
}

@IBAction func showColoringDescription(sender: AnyObject) {

performSegueWithIdentifier("showColoringDescriptionSegue", sender: sender)
}

}

Answer 1

你很接近。 showColoringDescription 的发送者是 UITapGestureRecognizer。更改签名以采用其中之一。然后将 sender.view 传递给 performSegueWithIdentifier。

在 prepareForSegue 中，将 sender 转换为 UIView 并将其用于 colorListTileArray 中的查找:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "showColoringDescriptionSegue" {

        let tappedTile = sender as! UIView
        let colorIndex = colorListTileArray.indexOf(tappedTile)

        print(colorIndex)
    }
}

@IBAction func showColoringDescription(sender: UITapGestureRecognizer) {
    performSegueWithIdentifier("showColoringDescriptionSegue", sender: sender.view)
}