autoLayout

[PlutusCat]

when i used snp layout llike
`
func createTableview() -> Void {
let changeCityTableView = ChangeCityTableView()
self.view.addSubview(changeCityTableView)
changeCityTableView.snp.makeConstraints { (make) in
make.edges.equalToSuperview()
}

    let tableViewWrapper = PullToBounceWrapper(scrollView: changeCityTableView)
    self.view.addSubview(tableViewWrapper)

    tableViewWrapper.didPullToRefresh = {
        Timer.schedule(delay: 2) { timer in
            tableViewWrapper.stopLoadingAnimation()
        }
    }
}

`
a crash open
assert(false, "Wow, scrollView.frame is CGRectZero. Please set frame size.")