如何使用Parse API搜索用户并将用户添加为PFRelation

Question

我想当一个按钮被点击时，一个UIAlertView弹出并提供一个textField供用户键入他想要添加的用户。该过程涉及在Parse.com上搜索EXACT用户名并将用户添加到currentUser的PFRelation。

下面是Swift中的代码:

@IBAction func addFriend(sender : AnyObject) {
    var currentUser = PFUser.currentUser()
    var alert = UIAlertController(title: "Add Friend", message: "Pleae enter a username.", preferredStyle: UIAlertControllerStyle.Alert)
    alert.addTextFieldWithConfigurationHandler({(textField: UITextField!) in
        textField.placeholder = "Username"
        textField.secureTextEntry = false
        // Add button actions here
        var addBtnAction = UIAlertAction(title: "Add", style: UIAlertActionStyle.Default) {
            UIAlertAction in
            var text : String = textField.text
            println("I want to add the user: (text)")
            var query = PFUser.query()
            query.whereKey("username", equalTo: text)
            query.getFirstObjectInBackgroundWithBlock {
                (object: PFObject!, error: NSError!) -> Void in
                if !object {
                    NSLog("The getFirstObject request failed.")
                    //add alertView here later
                } else {
                    // The find succeeded.
                    NSLog("Successfully retrieved the object.")
                    //This can find username successfully
                    var friendsRelation : PFRelation = currentUser.relationForKey("friendsRelation")
                    var user : PFUser = text  // <<<<---- This is the line that has problem
// Xcode tells me that I cannot express a String as a PFUser
// How can I add the user that has the exact same username?  
                }
            }
        }
        alert.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Default, handler: nil))
        alert.addAction(addBtnAction)
        self.presentViewController(alert, animated: true, completion: nil)
        })
}

非常感谢您的阅读。请帮帮我!!

Answer 1

如果我理解正确的话，你应该这样做:

friendsRelation.addObject(object);

其中object为您之前查询的PFUser。