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Objective c 我有两个问题吗?_Objective C_Parse Platform_Pfquery - Fatal编程技术网

Objective c 我有两个问题吗?

Objective c 我有两个问题吗?,objective-c,parse-platform,pfquery,Objective C,Parse Platform,Pfquery,由于PFFile只能通过GetDataInBackgroundithBlock检索,因为它们不是对象(我想..),所以在进行查询后,我调用GetDataInBackgroundithBlock将PFFile转换为UIImage 我是否通过调用FindObjectInBackgroundithBlock和GetDataBackgroundithBlock来进行两个查询?如果是这样的话,有没有办法只通过一个查询就完成这项工作 PFQuery *query = [PFQuery queryWithCl

由于PFFile只能通过GetDataInBackgroundithBlock检索,因为它们不是对象(我想..),所以在进行查询后,我调用GetDataInBackgroundithBlock将PFFile转换为UIImage

我是否通过调用FindObjectInBackgroundithBlock和GetDataBackgroundithBlock来进行两个查询?如果是这样的话,有没有办法只通过一个查询就完成这项工作

PFQuery *query = [PFQuery queryWithClassName:@"photoObject"];

    [query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error){

        for (id object in objects) {


            PFFile *imageFile = object[@"photo"];
            [imageFile getDataInBackgroundWithBlock:^(NSData *imageData, NSError *error) {
                if (!error) {

                    [self.annotationArray addObject:object[@"location"]];
                    NSLog(@"Annotation's coordinate : %@", self.annotationArray);


                    self.callOutImage = [UIImage imageWithData:imageData];

                    self.geoPoint = object[@"location"];

                    CLLocationCoordinate2D locCoord = CLLocationCoordinate2DMake(self.geoPoint.latitude, self.geoPoint.longitude);
                    CustomPin *pin = [[CustomPin alloc] initWithTitle:[object objectId] location:locCoord image:self.callOutImage];
                    [self.mainMap addAnnotation:pin];

                }}];

        }

    }];

您正在发出两个异步网络请求,但其中只有一个请求——findObjects——是查询。find返回一个指向文件的对象,为了获取文件的内容,需要第二个(非查询)请求

有一种方法可以处理来自客户端的单个请求:一个云函数,它执行与发布的代码基本相同的操作,然后返回检索到的数据