将数据从 Parse 服务器加载到数组中的模型文件中。

Question

我想将数据从解析服务器加载到名为 posts 的数组中的模型文件中，但我不知道如何。

这是代码：

struct Post

{ var createdBy: 用户 var timeAgo: 字符串？ var 标题：字符串？变种图像：UIImage？ var numberOfLikes：Int？ var numberOfComments：Int？ var numberOfShares: Int?

static func fetchPosts() -> [Post]
{
    var posts = [Post]()

    var usernameArray = [String]()
    var avaArray = [PFFile]()
    var dateArray = [Date?]()
    var picArray = [PFFile]()
    var titleArray = [String]()
    var uuidArray = [String]()


    let query = PFQuery(className: "posts")
    query.findObjectsInBackground { (objects: [PFObject]?, error: Error?) in
        if error == nil {
            usernameArray.removeAll(keepingCapacity: false)
            avaArray.removeAll(keepingCapacity: false)
            dateArray.removeAll(keepingCapacity: false)
            picArray.removeAll(keepingCapacity: false)
            titleArray.removeAll(keepingCapacity: false)
            uuidArray.removeAll(keepingCapacity: false)

            // find related objects
            for object in objects! {



                usernameArray.append(object.object(forKey: "username") as! String)
                avaArray.append(object.object(forKey: "ava") as! PFFile)
                dateArray.append(object.createdAt)
                picArray.append(object.object(forKey: "pic") as! PFFile)
                titleArray.append(object.object(forKey: "title") as! String)
                uuidArray.append(object.object(forKey: "uuid") as! String)
            }

        }
    }

     return posts
}

}

构造用户 { 变种用户名：字符串？ var profileImage: UIImage? }

Answer 1

试试这个

static func fetchPosts() -> [Post]
{
    var posts = [Post]()

    var usernameArray = [String]()
    var avaArray = [PFFile]()
    var dateArray = [Date?]()
    var picArray = [PFFile]()
    var titleArray = [String]()
    var uuidArray = [String]()


    let query = PFQuery(className: "posts")
    query.findObjectsInBackground { (objects: [PFObject]?, error: Error?) in
        if error == nil {                
            // find related objects
            if let returnedObjects = objects {
                for object in returnedObjects {
                    usernameArray.append(object["username"] as! String)
                    avaArray.append(object["ava"] as! PFFile)
                    dateArray.append(object.createdAt)
                    picArray.append(object["pic" as! PFFile)
                    titleArray.append(object["title"] as! String)
                    uuidArray.append(object["uuid"] as! String)
                }
            }
        }
    }

    return posts
}

为了将数据附加到您的 posts，您需要 - 将 PFFile 转换为 UIImage - 使用 UIImage 创建一个用户对象 - 将用户对象添加到您的 posts

if let avaPicture = object["ava"]! as! PFFile {
    avaPicture.getDataInBackground({ (imageData: Data?, error: Error?) -> Void in
        if (error == nil) {
            let image = UIImage(data: imageData!)
            if image != nil {
                // Create your User object with UIImage here
                let user = User()...

                // Add the new user and other data to your `posts`array
                ...
            }
        }
    })
}

将数据从 Parse 服务器加载到数组中的模型文件中。

Loading data from Parse server into a model file in an array.

parse-platform

swift

parse-server