Question

我写了一个类，其中包括从Parse.com获取，更新，添加和删除等方法。

我现在遇到了getFromParse方法的问题：

class ParseModul {

var returnArray = []



func getFromParse(className:String, whereKey:String, equalTo:String) -> NSArray {


    let query : PFQuery = PFQuery(className: className)
    query.whereKey(whereKey, equalTo: equalTo)


    query.findObjectsInBackgroundWithBlock {
        (objects: [AnyObject]?, error: NSError?) -> Void in

        if error == nil {
            if let objects = objects as? [PFObject] {
                var temp = [PFObject]()

                for object in objects {
                    temp.append(object)
                }
                self.returnArray = temp
                print(self.returnArray) // THIS IS THE DATA FROM PARSE
            }
        } else {
            print("Error: \(error!)")
        }
    }

    print(self.returnArray.count) // THIS IS 0

    if self.returnArray.count > 0 {

        return self.returnArray

    } else {

        self.returnArray = ["nothing"]

        return self.returnArray
    }

}
}

我用它：

let parse:ParseModul = ParseModul()
let mydata = parse.getFromParse("UserProfile", whereKey: "username", equalTo: "Phil")

该方法始终返回“无”。

Answer 1

在获取数据之前，您将返回数组。在块中获取的数据可能不会在函数中返回。

您可以在自己的区块中获取数据;

func getFromParse(className:String, whereKey:String, equalTo:String, completion:(arr:NSArray) -> Void)
 {


    let query : PFQuery = PFQuery(className: className)
    query.whereKey(whereKey, equalTo: equalTo)


    query.findObjectsInBackgroundWithBlock {
        (objects: [AnyObject]?, error: NSError?) -> Void in

        if error == nil {
            if let objects = objects as? [PFObject] {
                var temp = [PFObject]()

                for object in objects {
                    temp.append(object)
                }
                //??self.returnArray = temp
                //??print(self.returnArray) // THIS IS THE DATA FROM PARSE
                completion(temp);
            }
        } else {
            print("Error: \(error!)")
        }
    }
}

并像这样使用它;

let parse:ParseModul = ParseModul()
parse.getFromParse("UserProfile", whereKey: "username", equalTo: "Phil", completion: {
   (arr:NSArray) -> Void in
        self.returnArray = arr
        print(self.returnArray) // THIS IS THE DATA FROM PARSE
        // DO SOMETHING HERE

})

解析类以从Parse.com获取数据

1 个答案: