[iPhone] Switching current view crashes application

Question

I have a UISegmentedControl that alternates the current view. The problem is that after exact 4 clicks the controller crashes without any error message.
If a move the allocation of MyView1 to the init method the code works but the view won’t update. So I guess its something with the UIScrollView.
All suggestions are very appreciated.
- (void)segmentAction:(id)sender
UISegmentedControl* segCtl = sender;
[self.scrollView release];
self.scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 700, 420)];
self.scrollView.frame = CGRectMake(0, 0, 320, 420);
[self.scrollView setBackgroundColor:[UIColor whiteColor]];
switch ([segCtl selectedSegmentIndex]) {
case 1:{
CGRect frame = CGRectMake(0, 0, 456, 430);
MyView1 *v1 = [[MyView1 alloc] initWithFrame:frame];
[self.scrollView addSubview: v1];
[self.scrollView setContentOffset:CGPointMake(0,0) animated:YES];
[self.scrollView setContentSize: [v1 bounds].size];
[v1 release];
self.view = self.scrollView;
[self.scrollView setNeedsLayout];
[self.view setNeedsLayout];
break;
default:{
[self.customViewController reset];
self.view = self.customViewController.view;
[self.customViewController.view setNeedsLayout];
[self.view setNeedsLayout];
break;

Answer 1

So you have a segment control where you want to have it display either a scroll view or a custom view, right? I think the problem might have something to do with your allocs and releases, but that's just a theory. if 'scrollView' is declared as a 'retain' property, it will automatically be retained when set and released when you set the property to something else or nil. Also, why do you init the scroll view with one frame and then change the frame on the next line? Try this for kicks:
UIScrollView *temp = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 420)];
[temp setBackgroundColor:[UIColor whiteColor]];
self.scrollView = temp;
[temp release];
If you are not using 'retain' in your properties then that might be a problem.
Why do you call setNeedsLayout twice in both cases when view is the same as the other object?