layoutIfNeeded导致崩溃

Question

I have a UITextView, that is displaying text When the text is not very large(i'm speaking about 100-200 words), the app is working just fine

If it has EXTREMLY large texts(around 10000 words), it keeps crashing

The code

func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
    check(scrollView)
    let scrollPos = textView.contentOffset.y

    if dragging { return }
    if isAppearanceOpened { return }

    if scrollPos > 0 {
        UIView.animate(withDuration: 0.2, delay: 0, options: .curveEaseInOut, animations: {
            if scrollPos <= self.contentOffset {
                self.topView.alpha = 1
                self.pageView.alpha = 1
                self.topViewHeight.constant = 70
            } else {
                self.topView.alpha = 0
                self.pageView.alpha = 0
                self.topViewHeight.constant = 0
            }
            self.view.layoutIfNeeded()
        }) { (_) in
            if !decelerate { self.recheckEditorPosition() }
        }
    } else {
        UIView.animate(withDuration: 0.2, delay: 0, options: .curveEaseInOut, animations: {
            self.topView.alpha = 1
            self.pageView.alpha = 1
            self.topViewHeight.constant = 70
        }) { (_) in
            if !decelerate { self.recheckEditorPosition() }
        }
    }
}

The error

EXC_BAD_ACCESS (code=2, address=0x16d2a7ef0)

Console is clear, so i'm kind of confused If i'm removing self.view.layoutIfNeedee() , the app works just fine, but the animation is absent

Answer 1

So, i got a result out of my research The crash was caused by the textView contentInset. When the left and right insets are 0, it's working well on large texts, and my guess is that the calculation of the textView alignements, fonts, and so on are quite time consuming, so the compiler just gave a error.