UIScrollView's setContentOffset called before new subview is loaded

I have a UIView that I'm sliding in using a UIScrollView. Code looks like this:

[view setObject:object]; // updates a bunch of labels, images, etc
[scrollView addSubview:view];
[scrollView setContentOffset:CGPointMake(320,0) animated:YES];

Problem is, the scrollView doesn't seem to wait for the view to be completely loaded before animating its contentOffset, and so the animation is kinda jerky (almost non-existent on the first slide-in and on older devices). Oddly enough, switching the 3rd line to this fixes it:

[UIView animateWithDuration:0.3 animations:^{
    [scrollView setContentOffset:CGPointMake(320,0) animated:NO];
}];

No lag whatsoever, perfectly smooth slide-in. However, th开发者_StackOverflowis doesn't trigger any of the UIScrollViewDelegate calls, on which I also depend (but which aren't responsible for the lag).

Any idea of how I could tell the UIScrollView to wait for the view to be completely loaded before animating its contentOffset? Or maybe there's something else that I'm missing?

EDIT: before anyone else suggests it: yes, I did try:

[self performSelector:@selector(slideIn) withObject:nil afterDelay:1];

just to see if it would fix it. And yes it does fix the lag, but this is not an actual solution. performSelector:afterDelay: is never a solution, it's only a superficial fix. Plus, you're making the user wait extra seconds every time (since the actual delay may be much shorter than 1 second depending on the device model).

Performing selector after delay 0.01 works because the invocation is scheduled on the runloop vs. calling the method immediately. For that matter, afterDelay:0.0 may also work. Did not try in this particular case but works in may similar situations.

have you tried starting the scrolling in the "viewDidAppear" function of the viewcontroller... maybe this is called when the loading is finished.

otherwise try afterdelay with a very short time like 0.01 .. so that the call is scheduled next after the current work is done.

Try this, set contentSize after some delay (here delay is 2 second).

[view setObject:object];
[scrollView addSubview:view];
[self performSelector:@selector(contentSize) withObject:nil afterDelay:2];
}
-(void) contentSize {
[scrollView setContentOffset:CGPointMake(320,0) animated:YES];
}