Question

我正在尝试使用Parse作为PFFile保存配置文件图像。基本上，当前用户可以选择图像，图像应该保存在profilePic下的Profile类中，以便我以后检索。代码运行时没有错误，但图像没有在Parse中更新。它仍然具有我在LogIn为该用户设置的原始配置文件占位符图像，而不是所选的新图像。我是Swift和Parse的新手。如果您还有其他需要回答的问题，请告诉我。这是我在imagePickerController中的代码：

          self.dismissViewControllerAnimated(true, completion: nil)
    ProfileImage.image = image
    let profilePicData = UIImagePNGRepresentation(ProfileImage.image)
    let profilePicFile = PFFile(name: "imageProfile.png", data: profilePicData)


    var query = PFQuery(className: "Profile")

    query.findObjectsInBackgroundWithBlock({ ( objects, error) -> Void in

        if let objects = objects {

            for object in objects{

                var username = object["username"] as! String
                var id = object["userId"] as! String
                var profilePic = object["profilePic"] as! PFFile

                if id == PFUser.currentUser()?.objectId{

                    profilePic = profilePicFile

                    object.saveInBackgroundWithBlock{(success, error) -> Void in

                        if(error == nil)
                        {
                            println("success")
                        }
                    }
                }
            }

        }
    })

Answer 1

Swift不使用变量profilePic的引用，所以当你更新它时你没有更新你的对象，你需要更新你用来保存的对象变量，如下所示：

                var profilePic = object["profilePic"] as! PFFile

                if id == PFUser.currentUser()?.objectId{

                    // profilePic = profilePicFile - change this
                    object["profilePic"] = profilePicFile // for this

                    object.saveInBackgroundWithBlock{(success, error) -> Void in

                        if(error == nil)
                        {
                            println("success")
                        }
                    }
                }

Answer 2

https://www.parse.com/docs/ios/guide#files

最后，在保存完成后，您可以像其他任何数据一样将PFFile关联到PFObject：

在将PFFile分配给对象之前，必须保存它。实际上，正如Icaro指出的那样，你必须将图片直接分配给对象

ProfileImage.image = image
let profilePicData = UIImagePNGRepresentation(ProfileImage.image)
let profilePicFile = PFFile(name: "imageProfile.png", data: profilePicData)


var query = PFQuery(className: "Profile")

query.findObjectsInBackgroundWithBlock({ ( objects, error) -> Void in

    if(error == nil) {
        let profiles = (objects as? [PFObject]) ?? []
        for profile in profiles{

            var username = profile["username"] as! String
            var id = profile["userId"] as! String
            var profilePic = profile["profilePic"] as! PFFile

            if id == PFUser.currentUser()?.objectId{
               profilePicFile.save() //I would recommend you to do a save in background
               profile["profilePic"] = profilePicFile

                profile.saveInBackgroundWithBlock{(success, error) -> Void in

                    if(error == nil)
                    {
                        println("success")
                    }
                }
            }
        }

    }
})

需要帮助在Parse中更新信息

2 个答案: