Animations not starting directly after method call

Question

In my app delegate I perform my updateData method using performSelecorInBackground:withObject. At the end, a notification is posted which tells an observer in my tableview to reload the data.

My problem is with the animations: using the code below, my animations start at the end of the method and not directly after performSelector.

Does this have something to do with backgrounding the selector or is there something else I'm not seeing?

Any help would be greatly appreciated.

Thanks!

- (void) updateData: (NSString *)newVersionNumber {


    ... CODE ...


    UIView *update = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 360, 20)];
    update.backgroundColor = [UIColor blackColor];
    [self.navController.view addSubview:update];

    [self performSelector:@selector(updateDownAnimation) withObject:nil];


    ... CODE ...


    [[NSNotificationCenter defaultCenter] postNotificationName:@"tableviewShouldReload" object:nil];


    ... CODE ...

    [self performSelector:@selector(updateUpAnimation) withObject:nil];

}

- (void) updateDownAnimation {


    [UIView animateWithDuration:0.3 animations:^{
        _window.frame = CGRectOffset(_window.frame, 0, 20);

    }];

}

Answer 1

It is not advisable to do UIKit stuff on secondary threads. You might want to change that to

[self performSelectorOnMainThread:@selector(updateUpAnimation)
                       withObject:nil
                    waitUntilDone:YES];