That's a common problem, many people ask to me how to make it simple Ok, let's go to more one fast hint let's go coding in your - (void)viewDidLoad create a UITextField and set a text 
- (void)viewDidLoad
{
    UITextView *myTextView = [[UITextView alloc] initWithFrame:CGRectMake(10, 10, 300, 50)];
    [myTextView set:@"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus pellentesque orci ac quam cursus semper."];
    [self.view addSubview:myTextView];
    [super viewDidLoad];
}
execute... and result got like this Ok, but the text can be a bigger, and a UITextView get a scrollbar it's strange for user experience Ok, let's add a little code to solve that problem 
- (void)viewDidLoad
{
    UITextView *myTextView = [[UITextView alloc] initWithFrame:CGRectMake(10, 10, 300, 50)];
    [myTextView setText:@"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi eleifend urna non velit vulputate porttitor. Aenean odio enim, consequat at euismod sed, congue in massa. Fusce volutpat laoreet elementum. Nam purus nisi, tristique et adipiscing sed, egestas vel libero. Nam iaculis placerat lectus at lacinia. Proin aliquet arcu eu leo."];
    CGRect frame = myTextView.frame;
    frame.size.height = myTextView.contentSize.height;
    myTextView.frame = frame;
    [self.view addSubview:myTextView];
    [super viewDidLoad];
}
and now... UITextView resize auto, test with differents size of text For this hint is all up to the next Thanks