如何使用CKModifyRecordsOperation.perRecordProgressBlock更新进度

这与MRProgress最近的线程更新进度有关。由于先前的线程（感谢Edwin！），我将Cloudkit查询从便捷API转换为CKOperations。因此，在使用CKModifyRecordsOperation保存记录时，我可以通过登录perRecordProgressBlock来查看记录的进度，这很棒。但是，我试图将此进度发送回视图控制器，我不知道如何做到这一点。我为我的所有CloudKit方法创建了一个类-CKManager。我遇到的另一个问题是我不确定何时在VC中更新进度指示器（使用MRProgress框架）。是否在CKManager中调用保存操作之前，期间或之后调用它？是否应该递归调用它，直到进度== 1.0？这是我到目前为止的代码... 除更新/设置进度指示器动画外，其他所有方法都可以正常工作（显示并显示0％，然后在保存操作完成时消失）。另外，我在CKManager类中使用了一个属性（双重进度），我知道这是不正确的，但是我不确定其他方法。我也不认为我在下面的CKManager类中声明/定义的回调方法是正确的。任何指导表示赞赏！

CKManager.h

@property (nonatomic, readonly) double progress;
- (void)recordProgressWithCompletionHandler:(void (^)(double progress))completionHandler;

CKManager.m

    @property (nonatomic, readwrite) double progress;
    - (void)recordProgressWithCompletionHandler:(void (^)(double))completionHandler {

    completionHandler(self.progress);
}

- (void)saveRecord:(NSArray *)records withCompletionHandler:(void (^)(NSArray *, NSError *))completionHandler {

    NSLog(@"INFO: Entered saveRecord...");
    CKModifyRecordsOperation *saveOperation = [[CKModifyRecordsOperation alloc] initWithRecordsToSave:records recordIDsToDelete:nil];

    saveOperation.perRecordProgressBlock = ^(CKRecord *record, double progress) {
        if (progress <= 1) {
            NSLog(@"Save progress is: %f", progress);
            self.progress = progress;
        }
    };

    saveOperation.perRecordCompletionBlock = ^(CKRecord *record, NSError *error) {
        NSLog(@"Save operation completed!");
        completionHandler(@[record], error);
    };

    [self.publicDatabase addOperation:saveOperation];
}

Viewcontroller.m-这是从相机拍摄照片并调用CKManager类以准备记录并将其保存到CK并显示MRProgress指示符的方法中。

if (self.imageDataAddedFromCamera) {
            self.hud = [MRProgressOverlayView showOverlayAddedTo:self.myCollectionView animated:YES];
            self.hud.mode = MRProgressOverlayViewModeDeterminateCircular;
            self.hud.titleLabelText = UPLOADING_MSG;
            // prepare the CKRecord and save it
            [self.ckManager saveRecord:@[[self.ckManager createCKRecordForImage:self.imageDataAddedFromCamera]] withCompletionHandler:^(NSArray *records, NSError *error) {
                if (!error && records) {
                    NSLog(@"INFO: Size of records array returned: %lu", (unsigned long)[records count]);
                    CKRecord *record = [records lastObject];
                    self.imageDataAddedFromCamera.recordID = record.recordID.recordName;
                    NSLog(@"INFO: Record saved successfully for recordID: %@", self.imageDataAddedFromCamera.recordID);
                    [self.hud dismiss:YES];
                    [self.hud removeFromSuperview];
                    [self.imageLoadManager addCIDForNewUserImage:self.imageDataAddedFromCamera]; // update the model with the new image
                    // update number of items since array set has increased from new photo taken
                    self.numberOfItemsInSection = [self.imageLoadManager.imageDataArray count];
                    [self updateUI];
                } else {
                    NSLog(@"Error trying to save the record!");
                    NSLog(@"ERROR: Error saving record to cloud...%@", error.localizedDescription);
                    [self.hud dismiss:YES];
                    [self.hud removeFromSuperview];
                    [self alertWithTitle:YIKES_TITLE andMessage:ERROR_SAVING_PHOTO_MSG];
                }
            }];
            // where does this call belong?
            [self.ckManager recordProgressWithCompletionHandler:^(double progress) {
                dispatch_async(dispatch_get_main_queue(), ^{
                    NSLog(@"Updating hud display...");
                    [self.hud setProgress:progress animated:YES];
                });
            }];