Set the height of a UITextView from a UIViewController's viewWillAppear event

I'm trying to set the height of a UITextView from a UIViewController's viewWillAppear event, here's the code:

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];

    textView.text = blah blah...
    textView.frame = CGRectMake(textView.frame.origin.x, textView.frame.origin.y,
      textView.frame.size.width, textView.frame.size.height-20);
}

However, it seems to ignore my sizing, it's as though after this event is called, the textview is resized by something else.

What am i doing wrong? Is there some good way to do this?

Thanks

-edit-

Got it working by putting the code in my viewDidAppear instead of the viewWillAppear. So it works now.

Although i'm puzzled why i need to do this (remove 20 pixels from the bottom) - i mean shouldn't it resize to fill auto开发者_如何转开发matically? Why is it resizing to 20px too long? There's a tab bar at the bottom and a nav bar up the top. Is that confusing it?

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Simple but obvious question, does the text change, in other words, is the outlet hooked up in IB?

JUSTA TIP: Look at using the helper functions for CGRect such as:

textView.frame = CGRectInset(textView.frame, 0, 20);

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In an app with just this code and a single TextView the resizing occurs as expected. So..it's definitely something else in your app.

Are you maybe referencing the contentsize property or something else in your viewDidAppear?

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Got it working by putting the code in my viewDidAppear instead of the viewWillAppear. So it works now.

Although i'm puzzled why i need to do this (remove 20 pixels from the bottom) - i mean shouldn't it resize to fill automatically? Why is it resizing to 20px too long? There's a tab bar at the bottom and a nav bar up the top.