self-sizing uitableviewcell not recalculate content size when subview instrinsic content size has changed

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everyone, i have issue about uitableviewcell

custom uitableview cell which has subviews, one of which is custom image view named CustomIntrinsicImageView, and code as below:

class CustomIntrinsicImageView: UIImageView {
    var _preferredMaxLayoutWidth: CGFloat!
    var preferredMaxLayoutWidth: CGFloat! {
        get {
             return _preferredMaxLayoutWidth
        }

        set {
             _preferredMaxLayoutWidth = newValue
            invalidateIntrinsicContentSize()
        }
    }
    override func intrinsicContentSize() -> CGSize {
        if let size = image?.size {
            let width: CGFloat
            let height: CGFloat

            if let maxLayoutWidth = preferredMaxLayoutWidth where size.width > maxLayoutWidth {
                width = maxLayoutWidth
                height = maxLayoutWidth * size.height/size.width
           } else {
                width = size.width
                height = size.height
           }

           return CGSizeMake(width, height)
       }

        return CGSizeMake(UIViewNoIntrinsicMetric, UIViewNoIntrinsicMetric)
    }
}

the subviews have layout constraints to cell, and the image view update preferredMaxLayoutWidth in cell's layoutSubview body, code like this

override func layoutSubviews() {
    super.layoutSubviews()

    image🐶.preferredMaxLayoutWidth = CGRectGetWidth(contentView.bounds) - CGFloat(leftMarginImage + rightMarginImage)

}

the result of custom image view is perfect, but cell not recalculate height.

some of system UI like as UILable, UITextView has own instrinsicContentSize implement,which cooperate well with cell

so, the question is how to send information to cell, and let it know subview content size has change and recalculate height

thanks

asked 47 secs ago

ediv

1

self-sizing uitableviewcell not recalculate content size when subview instrinsic content size has changed