从 parse.com 检索信息时无法调用非函数类型 [PFObject] 的值

Question

我是 Swift 的新手，我正在学习如何使用 parse.com 存储和检索数据。我正在从 PARSE 下载一个 PFObjects 数组，然后我需要将它变成一个结构，所以我创建了这个函数：

func queryDownload (user : PFUser) {

    let objects: [PFObject]
    let query = PFQuery(className: "Gluc")
    query.whereKey("user", equalTo: user)
    do {
        objects = try query.findObjects() as [PFObject]

    } catch {
        print("ERROR")

    }
    let returnedObjects = objects {
        let elements = self.returnedObjects.count
        for i in 0...elements-1 {
            self.dataArray.append(MyData(gluc: Int(self.returnedObjects[i]["meassure"] as! String)!, fec: self.returnedObjects[i]["fec"] as! Date, alimento: self.returnedObjects[i]["alim"] as! Int, comentarios: self.returnedObjects[i]["notes"] as! String))

        }
    }

    self.dataArrayOrdered = self.dataArray.sorted(by: { [=11=].fec.compare(.fec) == .orderedAscending})

    print(self.dataArrayOrdered)
}

但我不能运行因为在这一行中：

let returnedObjects = objects {

说的是"Cannot call value of non-function type [PFObject]"

我不确定如何避免这个问题，所以任何帮助将不胜感激

谢谢

Answer 1

let returnedObjects = objects { ... }

是一个语法错误，你可能想要可选绑定值

if let returnedObjects = objects { ... }

但 objects 是非可选的，可选绑定是不可能的。

只需将值赋给变量并去掉大括号

do {
    let objects = try query.findObjects() as [PFObject]
    let returnedObjects = objects
    let elements = self.returnedObjects.count
    for i in 0...elements-1 {
        self.dataArray.append(MyData(gluc: Int(self.returnedObjects[i]["meassure"] as! String)!, fec: self.returnedObjects[i]["fec"] as! Date, alimento: self.returnedObjects[i]["alim"] as! Int, comentarios: self.returnedObjects[i]["notes"] as! String))
    }
    self.dataArrayOrdered = self.dataArray.sorted(by: { [=12=].fec.compare(.fec) == .orderedAscending})
    print(self.dataArrayOrdered)
} catch {
    print("ERROR", error)
}

将所有 good 代码放在 do 块中并打印实际错误而不是简单的文字字符串 [=16] 非常重要=]

然而这是 Swift 并且有一个更智能和更方便的方法使用 map 函数

do {
    let objects = try query.findObjects() as [PFObject]
    self.dataArray = objects.map { MyData(gluc: Int([=13=]["meassure"] as! String)!, fec: [=13=]["fec"] as! Date, alimento: [=13=]["alim"] as! Int, comentarios: [=13=]["notes"] as! String) }
    self.dataArrayOrdered = self.dataArray.sorted(by: { [=13=].fec.compare(.fec) == .orderedAscending})
    print(self.dataArrayOrdered)
} catch {
    print("ERROR", error)
}

从 parse.com 检索信息时无法调用非函数类型 [PFObject] 的值

Cannot call value of non-function type [PFObject] when retriving info from parse.com

parse-platform

swift

pfobject