ios - 在索引路径重新加载行不起作用

Question

在我的社交媒体应用程序中，我有一个点赞按钮...

var likers = [String]()

func like(sender: UIButton) {

    var buttonPosition: CGPoint = sender.convertPoint(CGPointZero, toView: self.table)

    var indexPath: NSIndexPath = self.table.indexPathForRowAtPoint(buttonPosition)!

    testConnection()

    var post = posts[indexPath.row]

    if sender.currentTitle == "Unlike" {

        dispatch_async(dispatch_get_main_queue()) {
            self.table.reloadRowsAtIndexPaths([indexPath], withRowAnimation: .Automatic)
        }

        sender.enabled = false

        post.removeObject(PFUser.currentUser()!.objectId!, forKey: "likers")
        post.saveInBackgroundWithBlock({ (success, error) -> Void in
            if success == true {
                sender.enabled = true
            }

            if error != nil {
                sender.enabled = true
            }
        })

    } else {
        dispatch_async(dispatch_get_main_queue()) {
            self.table.reloadRowsAtIndexPaths([indexPath], withRowAnimation: .Automatic)
        }

        sender.enabled = false

        dispatch_async(dispatch_get_main_queue()) {

            post.addUniqueObject(PFUser.currentUser()!.objectId!, forKey: "likers")
            post.saveInBackgroundWithBlock({ (success, error) -> Void in
                if success == true {
                    sender.enabled = true


                }

                if error != nil {
                    sender.enabled = true
                }

            })

        }
    }

}

出于某种原因，当我在 indexPath 重新加载行时，like 标签也没有改变，这也是我在 cellForRowAtIndexPath 中设置按钮的地方...

dispatch_async(dispatch_get_main_queue()) {
            if PFUser.currentUser()?.objectId != nil {
                if (post["likers"] as! NSMutableArray).containsObject(PFUser.currentUser()!.objectId!) {
                    postCellObj.likeButton.setTitle("Unlike", forState: .Normal)

                } else {
                    postCellObj.likeButton.setTitle("Like", forState: .Normal)

                }

            } else {
                postCellObj.likeButton.setTitle("Like", forState: .Normal)

            }
        }

        postCellObj.numberOfLikes.text = ((post["likers"] as! [String]).count - 1).description + " Likes"

有人知道这是怎么回事吗？谢谢!如果您需要更多信息，请告诉我! (:

Answer 1

如果我没看错你的代码，你在重新加载表格 View 单元格后删除了你的对象，而你正在重新加载你的单元格 - 标题仍然是“Unlike”，因为你的 objectId 仍然存在于你的数组中:

(1)

if sender.currentTitle == "Unlike" {
    dispatch_async(dispatch_get_main_queue()) { 
    self.table.reloadRowsAtIndexPaths([indexPath], withRowAnimation: .Automatic)
} 
...

(2)

if (post["likers"] as! NSMutableArray).containsObject(PFUser.currentUser()!.objectId!) {
    postCellObj.likeButton.setTitle("Unlike", forState: .Normal)
}

(3)

...

post.removeObject(PFUser.currentUser()!.objectId!, forKey: "likers")

尝试断点它。