Question

在最近更新swift编译器更新之前，此代码工作正常。我已经纠正了所有明显的错误，但由于某些原因，当我运行应用程序时，它会在for in loop尝试将[AnyObject]投射到我的自定义Memory类时崩溃。

日志和错误显示如下：

Has connectivity
Successfully retrieved 8 memories.
current memory: <Memories: 0x170120960, objectId: AO3EvPFob4, localId: (null)> {
ACL = "<PFACL: 0x174047e30>";
Date = "3915-04-08 05:00:00 +0000";
Guests = 4;
Title = test4;
}
Could not cast value of type 'PFObject' (0x100130bc0) to 'MemoryVault.Memory' (0x10012fa00).

所以我知道我正在从Parse中检索到8个正确的记忆，而且当前的记忆是正确的...它只是不会施放它。

代码：

    if (NetworkValidator.hasConnectivity()){ // Has internet connectivity
        println("Has connectivity")
        Memory.memoryQuery().findObjectsInBackgroundWithBlock{
            (objects: [AnyObject]?, error: NSError?) -> Void in
            if error == nil {
                // The find succeeded.
                 println("Successfully retrieved \(objects!.count) memories.")

                Memory.unpinAllInBackground(self.memories, block: {
                    (success: Bool, error: NSError?) -> Void in

                    // Clear current list
                    self.memories = [Memory]()

                    // Do something with the found objects
                    for memory in objects! {
                        println("current memory: \(memory)")
                        let currentMemory: Memory = memory as! Memory

                        // Save to localDataStore
                        currentMemory.pinInBackground()
                        println("\(currentMemory.memoryTitle) from Parse")

                        // Append to current
                        self.memories.append(currentMemory)
                    }
                })

                // Notify tableView to reload data
                self.memoriesTableView.reloadData()
            } else {

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

        }
    }

Answer 1

这个让我忙碌几个小时 - Parse-Documentation提到：

PFObject的强类型子类必须符合PFSubclassing协议，并且必须在调用[Parse setApplicationId：clientKey：]之前调用。“

通过在 AppDelegate 中调用 MyParseClass.registerSubclass（），我解决了我的问题！

PFObject无法转换为自定义子类

1 个答案: