Question

在我的swift 2应用程序中，我想发一个http-post-request来获取我的mysql数据库的数据。之后我想把这些数据写入我的核心数据。

我有请求和写的代码部分。

如何获得以下结构。

申请数据
如果请求数据完整写入核心数据

这可能是正确的吗？

这是我的Sync.swift文件中的SyncMYSQL函数。

class func SyncMYSQL() {

        print("START SYNC MYSQL")

        UIApplication.sharedApplication().networkActivityIndicatorVisible = true
        let managedObjectContext = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext
        let defaults = NSUserDefaults.standardUserDefaults()



            let request = NSMutableURLRequest(URL: NSURL(string: "https://xxx")!)
            request.HTTPMethod = "POST"
            let postString = "userid=12"


            request.HTTPBody = postString.dataUsingEncoding(NSUTF8StringEncoding)
            let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
                data, response, error in

                // if no internet connection
                guard error == nil && data != nil else {
                    print("error=\(error)")
                    return
                }

                let responseString = NSString(data: data!, encoding: NSUTF8StringEncoding)!


                let fetchRequest = NSFetchRequest(entityName: "ITEMS")
                fetchRequest.returnsObjectsAsFaults = false

                do {
                    let results = try managedObjectContext!.executeFetchRequest(fetchRequest)
                    for managedObject in results {
                        let managedObjectData:NSManagedObject = managedObject as! NSManagedObject
                        managedObjectContext!.deleteObject(managedObjectData)
                    }
                } catch let error as NSError {
                    print("Detele all data in ITEMS error : \(error) \(error.userInfo)")
                }



                var x = 0
                while (x < responseString.count ) {


                    let newItem = NSEntityDescription.insertNewObjectForEntityForName("ITEMS", inManagedObjectContext: managedObjectContext!) as! CoreData_ITEMS
                    newItem.name = responseString[x]
                    x++
                }

                dispatch_sync(dispatch_get_main_queue(),{
                    print("FINISH MYSQL")
                    UIApplication.sharedApplication().networkActivityIndicatorVisible = false
                });

            }
            task.resume()
        }

我可以通过这种方式从我的视图控制器调用此函数：

func RequestData() {

        Sync.SyncMYSQL()
print ("Start Core Data")

        let fetchRequest = NSFetchRequest(entityName: "ITEMS")
        do {
            try data = managedObjectContext!.executeFetchRequest(fetchRequest) as! [CoreData_ITEMS]
        } catch { }



        Table.reloadData()
    }

Answer 1

当操作结束时，你应该使用闭包块作为回调

class func SyncMYSQL(onSuccess: ()->()){

    // your custom events
    // your custom events
    // your custom events

    if MYSQLisSynced == true {
        // when MYSQL is synced you can call the success block
        onSuccess()
    }

}

在调用函数SyncMYSQL（）时的其他文件中，您必须指定on success block

SyncMYSQL { () -> () in
    //custom callback actions
}

预览任务完成后，swift执行任务

1 个答案: