从parse.com检索图像

Question

我不知道这是否可行，但我认为这是可能的，我不知道该怎么做。我只想从parse.com加载图像，就像从parse.com检索对象一样。我应该像从parse.com获取字符串一样吗？我刚刚发现如何在解析时保存图像但不知道如何获取它们。如果有人能告诉我这样做的链接或示例代码，我会很高兴。

我已经设置了一个从解析中检索的字符串：

PFQuery *query = [PFQuery queryWithClassName:@"app"];
[query getObjectInBackgroundWithId:@"ID"
                             block:^(PFObject *textdu, NSError *error) {
                                 if (!error) {



                                     UIFont *welcomeLabelFont = [UIFont boldSystemFontOfSize:17];

                                     welcomeLabel.text = [textdu objectForKey:@"ueberschriftnews"];
                                     welcomeLabel.font = welcomeLabelFont;
                                     welcomeLabel.textColor = [UIColor whiteColor];
                                     welcomeLabel.textAlignment = NSTextAlignmentCenter;
                                     welcomeLabel.backgroundColor = [UIColor clearColor];
                                     welcomeLabel.shadowColor = [UIColor blackColor];
                                     welcomeLabel.shadowOffset = CGSizeMake(0, 1);
                                     [contentView addSubview:welcomeLabel];



                                     // The get request succeeded. Log the score
                                     NSString *text = [textdu objectForKey:@"newstext"];
                                     UIFont *font = nil;
                                     CGFloat points = 17;
                                     CGFloat maxHeight = infoLabel.frame.size.height;
                                     CGFloat textHeight;
                                     do {
                                         font = [UIFont systemFontOfSize:points];
                                         CGSize size = CGSizeMake(infoLabelRect.size.width, 100000);
                                         CGSize textSize = [text sizeWithFont:font constrainedToSize:size lineBreakMode: NSLineBreakByWordWrapping];
                                         textHeight = textSize.height;
                                         points -= 1;
                                     } while (textHeight > maxHeight);
                                     infoLabel.text = text;
                                     infoLabel.numberOfLines = 9;
                                     infoLabel.font = font;
                                     infoLabel.textColor = [UIColor whiteColor];
                                     infoLabel.textAlignment = NSTextAlignmentCenter;
                                     infoLabel.backgroundColor = [UIColor clearColor];
                                     infoLabel.shadowColor = [UIColor blackColor];
                                     infoLabel.shadowOffset = CGSizeMake(0, 1);

                                     [infoLabel sizeToFit];
                                     [contentView addSubview:infoLabel];

                                 } else {

                                     infoLabel.text = @"something";
                                     [infoLabel sizeToFit];
                                     [contentView addSubview:infoLabel];
                                 }

                             }];

我的解析设置：

感谢。

Answer 1

是的，这是可能的。如果使用Web界面而不是字符串，则应将PFFile指定为类型。如果您从iOS客户端上传图片，则可以在此处找到解析iOS指南的链接https://parse.com/docs/ios_guide#files/iOS。 一旦你的图像在那里，你可以这样下载图像：

PFQuery *query = [PFQuery queryWithClassName:@"app"];
[query getObjectInBackgroundWithId:@"ID"
                         block:^(PFObject *textdu, NSError *error) {
{
     // do your thing with text 
     if (!error) {
          PFFile *imageFile = [textdu objectForKey:@"image"];
          [imageFile getDataInBackgroundWithBlock:^(NSData *data, NSError *error) {
              if (!error) {
                  UIImage *image = [UIImage imageWithData:data];
              }
          }];
     }
 }];