iOS 11 scroll滚动偏移，tableview偏移44，获取view的宽和高

 

1. tableview 的头部 有44的偏移量

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1>.设置 tableview的 属性           tableView.scrollIndicatorInsets = UIEdgeInsets.zero         self.translatesAutoresizingMaskIntoConstraints = false         if #available(iOS 11.0, *) {             tableView.contentInsetAdjustmentBehavior = .never         } else {             // Fallback on earlier versions         }   2>.在控制器设置属性         self.edgesForExtendedLayout = UIRectEdge(rawValue: 0)         if #available(iOS 11.0, *) {             extendedLayoutIncludesOpaqueBars = true         }else{             automaticallyAdjustsScrollViewInsets = false         }

　　

  

2.获取VFL自定义view的宽和高

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func sizeToFitForView(temView:UIView) -> (height:CGFloat, width:CGFloat){     temView.setNeedsLayout()     temView.layoutIfNeeded()     let height = temView.systemLayoutSizeFitting(UIView.layoutFittingCompressedSize).height     let width = temView.systemLayoutSizeFitting(UIView.layoutFittingCompressedSize).width     return (height, width) }

　　

3.VFL自定义tableview的headerView 获取宽和高

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override func layoutSubviews() {     super.layoutSubviews()     sizeHeaderToFit() }

　　

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/// 重置 tableview的header的frame private func sizeHeaderToFit() {     //FIXME: 这里一定要用过滤，不然会得到默认自带的headerView，高度还不可控     guard let headerView = tableView.tableHeaderView else { return }     headerView.setNeedsLayout()     headerView.layoutIfNeeded()     let height = headerView.systemLayoutSizeFitting(UIView.layoutFittingCompressedSize).height     var frame = headerView.frame     frame.size.height = height     headerView.frame = frame     tableView.tableHeaderView = headerView }

　　

4.如果用VFL 设置 ScrollView约束子视图 宽度 给一个固定值 子视图高度 加上底部约束 就不用设置 contentsize

    

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/// 添加ScrollView的子控件       func setScrollVSubviews(){           let vd : [String : UIView] = ["discountView":discountView,                                         "shopInfoView": shopInfoView,                                         "itemsView":itemsView,                                         "employeesInfoView":employeesInfoView]           vd.fastAddToView(scrollV)                       scrollV.fastAddConstraints("|[discountView(\(JY_DEVICE_WIDTH))]", vd)           scrollV.fastAddConstraints("|[shopInfoView(\(JY_DEVICE_WIDTH))]", vd)           scrollV.fastAddConstraints("|[itemsView(\(JY_DEVICE_WIDTH))]", vd)           scrollV.fastAddConstraints("|[employeesInfoView(\(JY_DEVICE_WIDTH))]", vd)           scrollV.fastAddConstraints("V:|[discountView][shopInfoView][itemsView][employeesInfoView]|", vd)       }