ios - 如何从 UIImageView 将图像上传到 Parse.com

Question

我的应用程序名为“Draw Me”并使用 Parse.com。用户在UIImageView中绘制图像，应将其保存（上传）到Parse.com。有人可以建议怎么做吗？

Answer 1

Parse 有一个关于这个确切主题的 iOS 教程：https ://parse.com/tutorials/anypic

Christian 已经概述了如何保存图像本身，但我假设您也希望将其与 PFObject 相关联。基于他的答案（以保存为 jpeg 的示例）

// Convert to JPEG with 50% quality
NSData* data = UIImageJPEGRepresentation(imageView.image, 0.5f);
PFFile *imageFile = [PFFile fileWithName:@"Image.jpg" data:data];

// Save the image to Parse

[imageFile saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
    if (!error) {
        // The image has now been uploaded to Parse. Associate it with a new object 
        PFObject* newPhotoObject = [PFObject objectWithClassName:@"PhotoObject"];
        [newPhotoObject setObject:imageFile forKey:@"image"];

        [newPhotoObject saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
            if (!error) {
                NSLog(@"Saved");
            }
            else{
                // Error
                NSLog(@"Error: %@ %@", error, [error userInfo]);
            }
        }];
    }
}];

Answer 2

以下是如何执行此操作：

UIImageView *imageView; // ...image view from previous code
NSData *imageData = UIImagePNGRepresentation(imageView.image);
PFFile *file = [PFFile fileWithData:imageData]
[file saveInBackground];

...并再次检索它：

[file getDataInBackgroundWithBlock:^(NSData *data, NSError *error) {
  if (!error) {
    imageView.image = [UIImage imageWithData:data];
  }
}];