Question

问题：我无法找到我按下的删除按钮，并将其与单元格中的视频绑定，以便我可以在Parse上删除它。

我在cellForIndexAtIndexPath

中以编程方式添加了一个按钮

self.deleteButton = UIButton(frame: CGRectMake(cell.frame.size.width / 1.5, 10, 30, 30))
let deleteImage = UIImage(named: "deleteVideoButton.png")
self.deleteButton.setBackgroundImage(deleteImage, forState: .Normal)
self.deleteButton.tag = indexPath.row
self.deleteButton.addTarget(self, action: "deleteCellFromButton", forControlEvents: UIControlEvents.TouchUpInside)
cell.addSubview(self.deleteButton)

按钮显示在UICollectionView中的每个单元格显示上我有一个调用deleteCellFromButton（）的函数。我知道我应该使用index.path但是我不能在这个函数中调用它。

func deleteCellFromButton() {

    var alert = UIAlertController(title: "Are you sure?", message: "This video will be deleted forever", preferredStyle: UIAlertControllerStyle.ActionSheet)

    let confirmAction : UIAlertAction = UIAlertAction(title: "Ok!", style: .Default) { (action) -> Void in

        var query = PFQuery(className: "Movie")
        query.whereKey("username", equalTo: (PFUser.currentUser()?.username)!) 

// here is where I think this goes query.whereKey("videoFile", equalTo: self.videoArray[index.path.row]) ???



        query.findObjectsInBackgroundWithBlock { (objects: [AnyObject]?, error: NSError?) -> Void in

            if error != nil {

                print(error)

            } else {

                for object in objects! {
                    print(object)

                    object.deleteInBackgroundWithBlock({ (success: Bool, error: NSError? ) -> Void in

                        //put after delete code stuff here.

                    })

                }

            }

        }

    }

    let cancelAction : UIAlertAction = UIAlertAction(title: "Cancel", style: .Cancel) { (error) -> Void in

    }

    alert.addAction(confirmAction)
    alert.addAction(cancelAction)

    self.presentViewController(alert, animated: true, completion: nil)

}

Answer 1

将目标函数更改为:的名称。在这里，您可以将按钮传递给目标函数。

self.deleteButton.addTarget(self, action: "deleteCellFromButton:", forControlEvents: UIControlEvents.TouchUpInside)

在您的函数中使用您的button.tag：

func deleteCellFromButton(button: UIButton) {
    println(button.tag)
}

使用Button - Swift从UICollectionView查找和删除视频

1 个答案: