Question

In this code example, i am trying to produce the following view hierarchy

Window -> background image -> scroll view -> text view

All i see however is

Window -> background image

What am i missing please?

-(void) viewWillAppear:(BOOL)animated {

    UIScrollView *scrollWindow = [[UIScrollView alloc] 
                 initWithFrame:CGRectMake(30, 30, 440, 212)];

    UITextView *scrollableText = [[UITextView alloc] init];

    [scrollableText setEditable:NO];
    [scrollableText setText:@"Why, hello there"];

    [scrollWindow addSubview:scrollableText];

    UIImage *backgroundImage = [[UIImage alloc] initWithCGImage:
             [UIImage imageNamed:@"about_bg.png"].CGImage];
    UIImageView *backgroundView = [[UIImageView alloc] 
             initWithImage:backgroundImage];

    [backgroundView addSubview:scrollWindow];

    [[self view] addSubview:backgroundView];

}

Answer 1

Andrew is right about not making the scroll view a subview of the background UIImageView view. But the scroll view is invisible. Only its content (scrollableText) will show. And you haven’t set scrollableText‘s frame, so it’s effectively invisible too. Init like so:

[scrollableText setEditable:NO];
[scrollableText setText:@"Why, hello there"];
[scrollableText setFrame:CGRectMake(0, 0, 100, 100)];

And you should see it.