SVProgressHUD如何在下一个ViewController中显示

Question

我有一个TableViewController与一些项目，然后有一个filterViewController，其中过滤数据在TableViewController根据值。它是用UISwitch制成的。无论如何，我想问，如何添加一个SVProgressHUD的动作，当我从filterViewController返回过滤数组。过滤并在tableView中显示它们需要一些时间。我已经尝试过dispatch_async，它甚至不显示HUD。我有一个IBAction按钮在filterViewController确认值，并将它们发送到TableViewController。

如果我在filterViewController中添加HUD, HUD不会在TableViewController中显示。

filterViewController.m

-(IBAction)Done:(id)sender{
    [self willMoveToParentViewController:nil];
    [self.navigationController popViewControllerAnimated:YES];

}

TableViewController.m

- (void)filterController:(filterViewController *)controller didEditConfig:(NSMutableDictionary *)config
{
    [SVProgressHUD showWithMaskType:SVProgressHUDMaskTypeGradient];
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        // time-consuming task
        self.konfigg = config;

        NSSet *filter = [config keysOfEntriesPassingTest:
                         ^BOOL (id key, NSNumber *value, BOOL *stop) {
                             return [value boolValue];
                         }];
        NSLog(@"filtered keys: %@ (%lu of %lu)", filter, (unsigned long)filter.count, (unsigned long)config.count);
        PFQuery *query = [PFQuery queryWithClassName:@"Class"];
        [query addDescendingOrder:@"createdAt"];
        [query whereKey:@"eventDay" containedIn:[filter allObjects]];
        [query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
            if (!error) {
                self.itemss = [objects mutableCopy];
                [self.MainTable reloadData];
                NSLog(@"Got filtered results %@ (%lu)", objects, (unsigned long)objects.count);
            }}
         ];
        dispatch_async(dispatch_get_main_queue(), ^{
            [SVProgressHUD dismiss];
        });
    });
}

Answer 1

明白了。为TableViewController中的过滤器做BOOL。这比我想象的要容易。