ios - 如何识别触发单个 Storyboard转场的众多按钮中的哪个按钮

Question

我在一个 View 上有 77 个按钮。这 77 个纽扣在一个收藏 socket 中。这些按钮被连线以触发相同的 segue。 segue 呈现一个 detailViewController，其中包含从按钮传递给它的信息。我需要知道哪个按钮触发了 segue，以便我知道要将哪些数据传递给细节 Controller 。

我在 viewDidLoad 方法中设置标签:

override func viewDidLoad() {
    super.viewDidLoad()

    self.containerView.backgroundColor = UIColor.blackColor()

    var count = 0

    for item in buttonOutlets {

        item.layer.cornerRadius = 2.0
        item.layer.borderWidth = 2.0
        item.tag = count
        item.layer.borderColor = UIColor.yellowColor().CGColor
        item.addTarget(self, action: Selector("handleButtonPress"), forControlEvents: UIControlEvents.TouchUpInside)

        count = count + 1
        println(item.tag)   // prints correct tag numbers

    }

    self.fetchAllObjects()

}

这是我的prepareForSegue:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    var upcoming: itemDetail = segue.destinationViewController as! itemDetail

if (segue.identifier == "loadDetailView") {

println(buttonOutlets[1].tag) // prints correct tag number

    let objectPlace = sender?.tag
    upcoming.parseObject = collectionObjects[objectPlace!] as? PFObject
}

Answer 1

答案在于 item.addTarget。 操作选择器调用 handleButtonPress。我原来的按钮按下处理程序是:

func handleButtonPress(sender: UIButton) {
    self.performSegueWithIdentifier("loadDetailView", sender: self)        
}

我缺少的是 sender: sender:

func handleButtonPress(sender: UIButton) {      
    self.performSegueWithIdentifier("loadDetailView", sender: sender)     
}

然后在handleButtonPress调用中添加一个冒号:

 item.addTarget(self, action: Selector("handleButtonPress:"), forControlEvents: UIControlEvents.TouchUpInside)