CODEWITHSUNDEEP
iosobjective-ccocoa-touchuitextview
colinbrash
colinbrash

Reputation: 481

UITextView contentOffset changes between viewDidLoad and viewDidAppear

On iOS 8 (I have not tested on iOS 7) I have a UITextView that has its text set in the storyboard. When the view actually appears, the text appears scrolled and I do not want it scrolled. In fact, I have no idea why anyone would. Can anyone explain how to change this behavior so it appears scrolled to the top as it should?

This is extremely easy to reproduce:

  1. Start a new project
  2. Add a UITextView with constraints to sticky it to the margins
  3. Fill it with more text than will fit in its bounds (helps to increase the font size to something like 36).
  4. Run.

It is immediately visually obvious, but if you log what is going on you will see something like the following:

2015-03-10 10:34:47.198 ScrollViewTest[61180:2610445] [Inside viewDidLoad] <UITextView: 0x7f9c79851200; frame = (0 0; 600 600); text = 'Lorem ipsum dolor sit er ...'; clipsToBounds = YES; autoresize = RM+BM; gestureRecognizers = <NSArray: 0x7f9c78c89df0>; layer = <CALayer: 0x7f9c78c8c220>; contentOffset: {0, 0}; contentSize: {600, 592}>
2015-03-10 10:34:47.288 ScrollViewTest[61180:2610445] [Inside viewDidAppear] <UITextView: 0x7f9c79851200; frame = (0 0; 375 667); text = 'Lorem ipsum dolor sit er ...'; clipsToBounds = YES; autoresize = RM+BM; gestureRecognizers = <NSArray: 0x7f9c78c89df0>; layer = <CALayer: 0x7f9c78c8c220>; contentOffset: {0, 457.5}; contentSize: {375, 1176}>

Presumably this is because of the frame and/or contentSize change from the initial load from the storyboard to the actual dimensions it needs to display.

This seems similar to UITextView contentOffset is set but the accepted answer to that question does not work. This is also not solved by setting self.automaticallyAdjustsScrollViewInsets = NO.

Upvotes: 4

Views: 2533

Answers (2)

Roohul
Roohul

Reputation: 1027

I faced the same problem. I got rid of that by just adding a 1 line code in viewDidAppear

[yourTextView setContentOffset: CGPointMake(0,0) animated:NO];

You can play with CGPointMake as you wish but this worked for me well. Hope this helps.

Upvotes: 0

Jeffery Thomas
Jeffery Thomas

Reputation: 42588

My guess is that when auto layout is applied, the content offset is mangled. This happens right before -layoutSubviews is performed.

So to fix this issue, I could recommend two solutions.

  1. Subclass UITextView and set contentOffset in -layoutSubviews.
  2. Add -viewDidLayoutSubviews to your view controller and set contentOffset for any text views there.

Both of these are kind of hacky workarounds, but are better hacky workarounds than -viewDidAppear: or dispatch_async().

NOTE: Take care to ensure you only adjust the contentOffset in -layoutSubviews or -viewDidLayoutSubviews when appropriate.

Upvotes: 7

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