collectionViewContentSize in iOS 10 using self-sizing cells

Question

Prior to iOS 10, I had a self-sizing table view that solely consisted of a UICollectionView with self-sizing cells using a standard UICollectionViewFlowLayout. The collection v

Answer 1

I got same issue when develop my app on iOS 10 and set UICollectionViewDataSource to itself on awakeFromNib,like this:

override func awakeFromNib() {
    super.awakeFromNib()
    let layout = UICollectionViewFlowLayout()
    // set your layout 
    collectionViewLayout = layout
    // set dataSource equal to self in here cause a crash
    dataSource = self
}

then I move the UICollectionViewDataSource setting code to layoutSubviews,the problem solved,like this:

override func layoutSubviews() {
        super.layoutSubviews()
        dataSource = self
    }

override func awakeFromNib() {
    super.awakeFromNib()
    let layout = UICollectionViewFlowLayout()
    // set your layout 
    collectionViewLayout = layout
    // set dataSource equal to self in here cause a crash
    dataSource = self
}

Hope this help!