如何快速解析加载图像? [英] How do I load an image from parse in swift?

问题描述

我想知道是否有人可以帮助我，我是应用程序开发的新手 我正在从应用程序上传图像以在解析文档的帮助下进行解析.

I was wondering if anyone can help me, I'm new to app developing I am uploading images from my app to parse with no problem with help from parse documentation.

    let imageData = UIImagePNGRepresentation(scaledImage)
    let imageFile: PFFile = PFFile(data: imageData)

    var userPhoto = PFObject(className: "postString")
    userPhoto["imageFile"] = imageFile
    userPhoto.saveInBackground()

但是当我添加代码以取回图像时，我有点迷路了:/

but when i add the code to retrieve the image back, I'm a bit lost :/

let userImageFile = anotherPhoto["imageFile"] as PFFile
userImageFile.getDataInBackgroundWithBlock {
(imageData: NSData!, error: NSError!) -> Void in
  if !error {
     let image = UIImage(data:imageData)
   }
}

"anotherPhoto"从哪里来?解析确实说过在这里，我们从另一个名为anotherPhoto的UserPhoto中检索图像文件:"

where is the "anotherPhoto" coming from ? Parse did say "Here we retrieve the image file off another UserPhoto named anotherPhoto:"

推荐答案

anotherPhoto将是您的postString(在您的上载示例中为userPhoto)的一个实例.适用于您的文件下载示例如下:

anotherPhoto would be an instance of your postString (userPhoto in your upload example). The file downloading example that would work for you is like this:

let userImageFile = userPhoto["imageFile"] as PFFile
userImageFile.getDataInBackgroundWithBlock {
    (imageData: NSData!, error: NSError!) -> Void in
    if !error {
        let image = UIImage(data:imageData)
    }
}

任何PFFile必须从普通PFObject引用，否则无法检索. PFFile对象本身将不会显示在数据浏览器中.

Any PFFile must be referenced from a normal PFObject or it cannot be retrieved. PFFile objects themselves will not show up in the data browser.

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