swift - Q : How to Update Boolean Value?

Question

我遇到了一个小问题。我正在尝试更新我的 Quiz 应用程序中的 Bool 值。如果初始值为 true 并且在用户猜对了问题之后，我希望这个值变为 false。到目前为止，println("Will be updated to false") 确实向我展示了我想要的结果，但我想不出在 Parse 中更新“check”列中的值的方法。

 var query = PFQuery(className:"Questions")
        query.whereKey("check", equalTo:true)
        query.findObjectsInBackgroundWithBlock {
            (objects: [AnyObject]!, error: NSError!) -> Void in
            if error == nil {
                // The find succeeded.
                println("Successfully retrieved \(objects.count) scores.")
                // Do something with the found objects
                if let objects = objects as? [PFObject] {
                    for object in objects {
                        println(object.objectId)
                    println("Found the true value")
                        if object["check"] as Bool == true  {
                            println("Will be updated to false")

                            }

                        }
                }
            } else {
                // Log details of the failure
                println("Error: \(error) \(error.userInfo!)")
            }
        }

非常感谢您的帮助!

Answer 1

首先，您编辑对象，然后保存它们以供解析。试试这个:

var query = PFQuery(className:"Questions")
query.whereKey("check", equalTo:true)
query.findObjectsInBackgroundWithBlock {
    (objects: [AnyObject]!, error: NSError!) -> Void in
    if error == nil {
        // The find succeeded.
        println("Successfully retrieved \(objects.count) scores.")
        // Do something with the found objects
        if let objects = objects as? [PFObject] {

            // === cache the objects, you want to edit ===
            var tmp = [PFObject]()
            // ===========================================

            for object in objects {
                println(object.objectId)
                println("Found the true value")
                if object["check"] as Bool == true  {
                    println("Will be updated to false")

                    //=== Set the object to false =======
                    object["check"] = false
                    tmp.append(object)
                    //===================================
                }
            }

            // === save all edited objects ===========
            PFObject.saveAllInBackground(tmp, block: {
                (success: Bool!, error: NSError!) -> Void in
                if success == true {
                    println("done")
                }
            })
            // =======================================

        }
    } else {
        // Log details of the failure
        println("Error: \(error) \(error.userInfo!)")
    }
}