Ios 如何在UITextView、Swift3&；上显示数组元素；解析服务器（bitnami）

我是swift/Parse服务器新手，正在努力显示存储在Parse服务器中的数组元素（

bitnami

）

它最终按我所希望的那样工作，但它看起来非常奇怪，我不明白为什么它工作得很好

有没有人能理解它为什么起作用

ViewController.swift

query？.limit=1
query？.findObjectsInBackground（块：{（对象，错误）在
如果让用户=对象{
对于用户中的对象{
如果让用户=对象为PFUser{
self.userName.text=user.userName！
如果让userCarType=user[“carType”]作为数组{
self.carTypeText.text=userCarType[0]作为！字符串
}

解析服务器

列：carType（数组）

价值：“丰田，福特”

它在UITextField上的显示方式：

---

丰田，福特

下面是代码的一些解释，如果您需要更多解释，请让我知道

    let query = PFQuery(className:"UserCarTypes") /// name of your table
    query.includeKey("UserPointer") // if you have pointers like user (and you want to load this data also)
    query.whereKey("x", equalTo: false) // set some conditions in query if needed
    query.findObjectsInBackground { (objects: [PFObject]?, error: Error?) in

        // query always returns the objects (rows) in a [PFObject] array

        // first check for error or nil
        if error != nil {
            print(error!)
            return
        }

        if objects?.count == 0 || objects == nil {
            print("no data retrieved")
            return
        }

        //loop throught objects
        if let users = objects {
            for object in users {

                //set user label
                if let user = object as? PFUser {
                    self.userName.text = user.username! // set username on text label (this assumes there is always a username, otherwise your app will crash)

                }

                //set carType label
                if let userCarType = user["carType"] as? NSArray { // downcast the row data from the PFObject to an Array
                    if let first_car = userCarType[0] as? String { // set the first value of your array of userCarType: Toyota
                        if let second_car = userCarType[1] as? String { // set the second value of your array: Ford
                            self.carTypeText.text = "\(first_car),\(second_car)" // set both car types on the TextLabel
                        } else {
                            self.carTypeText.text = "\(first_car)" // set only the first car type on the TextLabel
                        }
                    }
                }
            }
        }
    }

    let query = PFQuery(className:"UserCarTypes") /// name of your table
    query.includeKey("UserPointer") // if you have pointers like user (and you want to load this data also)
    query.whereKey("x", equalTo: false) // set some conditions in query if needed
    query.findObjectsInBackground { (objects: [PFObject]?, error: Error?) in

        // query always returns the objects (rows) in a [PFObject] array

        // first check for error or nil
        if error != nil {
            print(error!)
            return
        }

        if objects?.count == 0 || objects == nil {
            print("no data retrieved")
            return
        }

        //loop throught objects
        if let users = objects {
            for object in users {

                //set user label
                if let user = object as? PFUser {
                    self.userName.text = user.username! // set username on text label (this assumes there is always a username, otherwise your app will crash)

                }

                //set carType label
                if let userCarType = user["carType"] as? NSArray { // downcast the row data from the PFObject to an Array
                    if let first_car = userCarType[0] as? String { // set the first value of your array of userCarType: Toyota
                        if let second_car = userCarType[1] as? String { // set the second value of your array: Ford
                            self.carTypeText.text = "\(first_car),\(second_car)" // set both car types on the TextLabel
                        } else {
                            self.carTypeText.text = "\(first_car)" // set only the first car type on the TextLabel
                        }
                    }
                }
            }
        }
    }