UIScrollView scrolled after setContentSize

Question

So I want to create some detail content in UIView(320,470) that taller than Viewport (320, 367).

I create it separated in IB like (see pic.). Everything looks OK until I setContentSize to make the UIScrollView scrollable..

This is my code placed in ViewDidLoad

CGRect frame = self.uiContent.frame;
[self.uiScrollView addSubview:self.uiContent];
[self.uiScrollView setContentSize:frame.size];

The content is scrolled with animation to middle after setContentSize is called.. How to prevent that auto-scroll?

enter image description here

don't know but you can try [uiScrollView scrollsToTop] after that — Zaraki, Oct 01 '12 at 05:01
did you try addSubview after setContentSize, is it same of different?? — Zaraki, Oct 01 '12 at 05:04
I already try that... scrollsToTop, change the sequence and do both... No luck... — Tek Yin, Oct 01 '12 at 06:58
still no luck... I think `setContentSize` call something that cause the ScrollView geting scrolled.. But It is no scrolled if I add simple `UIView` with color.. weird thing.. — Tek Yin, Oct 02 '12 at 06:53

score 1 · Accepted Answer · edited May 23 '17 at 12:19

I found the culprit.. It was UITextView. Sorry if I don't mention I use UITextView for multiline label under address label.

Quoting "Taketo Sano" on other question : https://stackoverflow.com/a/5673026/453407

I've investigated how the auto-scroll is done by tracking the call-trace, and found that an internal [UIFieldEditor scrollSelectionToVisible] is called when a letter is typed into the UITextField. This method seems to act on the UIScrollView of the nearest ancestor of the UITextField.

UIScrollView is auto scrolled to UITextView when UITextView text is changed. So I found the solution by subclassing UIScrollview and override

- (void)scrollRectToVisible:(CGRect)rect animated:(BOOL)animated {

and return nothing to disable the auto scroll... If you plan to use it in future, just use a bool variable to enable / disable it by using

- (void)scrollRectToVisible:(CGRect)rect animated:(BOOL)animated {
    if (!self.disableAutoScroll) {
        [super scrollRectToVisible:rect animated:animated];
    }
}

so you can disable the autoscroll before you change the UITextView by code and enable it after.

UIScrollView scrolled after setContentSize

1 Answers1