How to handle resizing label in scrollview

[Radagan]

Hi Tasharen,

Basically, I am trying to get a scrollview that contains a single label to scroll when the label resizes height. The text in the label is set in code. I can't seem to find a way to get it to work.

I can get the label to resize properly with advanced anchors and "resize height" selected, and the vertical scroll bar appears and resizes properly. The problem is when you move the scroll bar the text bobs a little, but you does not scroll down with the scroll bar. 

Any ideas?

-R.

[ArenMook]

I recently had to do this for a video... http://www.youtube.com/watch?v=otqY_Mx11yw

Simply call scroll view's UpdatePosition() after changing the text. I've done it inside the TypewriterEffect for that video.

[Radagan]

Excellent! Thank you very much. 

[manumoi]

Hello I have a slightly similar issue except that I have several labels and sprites after each others in my scrollview i.e.:

backgroundSprite //the one directly attached to the scrollview, size adjusted to itemSprite.Top and Label4.bottom
-- ItemSprite
-- titleBar1
-- Label1
-- titleBar2
-- Label2
-- TitleBar3
-- Label3
-- TitleBar4
-- Label4

the top position of each element is obtained from the bottom of the upper element, using the anchor system.
TitleBar have fixed sizes
Label values can be changed programmatically since they come from a data structure. So label heights are obtained by putting label's Overflow parameter to ResizeHeight and their bottomAnchor values to none.

First i thought that everything was ok but i eventually noticed that sometimes the height of one of my label doesn t adjust. Tried different variants of updatePosition, resetPosition, InvalidateBounds (not sure what the last one does) but can't figure out how to fix the bug.

Even stranger, when i m in editor mode with the interface playing and i go to the anchor system of the UILabel that didn t adjust well, just putting a value (without validating it) in the bottomAnchor absolute field will trigger the height update to the correct value. So there must be some update occurring here.


Latest of my numerous code attempts below where I reinitialize the labels from a data structure

1.     public void init(Content content)
2.     {
3.         this.content = content;
4.         this.scrollView.ResetPosition();
5.         this.contentPictureSprite.spriteName = content.Id + ".icon";  //itemSprite
6.         this.contentPictureSprite.keepAspectRatio = UIWidget.AspectRatioSource.Free;
7.         this.contentPictureSprite.MakePixelPerfect();
8.         float ar = (float)this.contentPictureSprite.width / (float)this.contentPictureSprite.height;
9.         this.contentPictureSprite.aspectRatio = ar;
10.         this.contentPictureSprite.keepAspectRatio = UIWidget.AspectRatioSource.BasedOnWidth;
11.         this.contentPictureSprite.leftAnchor.relative = 0f;
12.         this.contentPictureSprite.leftAnchor.absolute = 0;
13.         this.contentPictureSprite.rightAnchor.relative = 1f;
14.         this.contentPictureSprite.rightAnchor.absolute = 0;
15.         this.descriptionLabel.text = content.Description; // label1
16.         this.scrollView.UpdatePosition();
17.         this.characteristicsLabel.text = content.Characteristics; // label2
18.         this.scrollView.UpdatePosition();
19.         this.availabilityLabel.text = content.Availability;  // label3
20.         this.scrollView.UpdatePosition();
21.         this.audienceLabel.text = content.Audience; // label4
22.         this.scrollView.UpdatePosition();
23.         /*this.scrollView.InvalidateBounds();
24.         this.scrollView.ResetPosition();
25.         this.scrollView.UpdatePosition();*/
26. }
27.  

I have attached a screenshot (left when the issue occurs, right when it automatically adjust once i enter a value in the bottomAnchor.absolute field)

Any idea what I am missing?
 

[ArenMook]

Whenever you alter anchors like that you must call widget.ResetAndUpdateAnchors().