surprised isn't working out of box, seems important use case stack views. have uitableviewcell subclass adds uistackview contentview. i'm adding labels stack view in tableview(_cellforrowatindexpath:) , tableview set use dynamic row heights, doesn't appear work, @ least in xcode 7.3. under impression hiding arranged subviews in stack view animatable, seems broken well.
any ideas on how working correctly?
class stackcell : uitableviewcell { enum visualformat: string { case horizontalstackviewformat = "h:|[stackview]|" case verticalstackviewformat = "v:|[stackview(>=44)]|" } var hassetupconstraints = false lazy var stackview : uistackview! = { let stack = uistackview() stack.axis = .vertical stack.distribution = .fillproportionally stack.alignment = .fill stack.spacing = 3.0 stack.translatesautoresizingmaskintoconstraints = false return stack }() override init(style: uitableviewcellstyle, reuseidentifier: string?) { super.init(style: style, reuseidentifier: reuseidentifier) contentview.addsubview(stackview) } required init?(coder adecoder: nscoder) { fatalerror("init(coder:) has not been implemented") } override func updateconstraints() { if !hassetupconstraints { hassetupconstraints = true let viewsdictionary: [string:anyobject] = ["stackview" : stackview] var newconstraints = [nslayoutconstraint]() newconstraints += self.newconstraints(visualformat.horizontalstackviewformat.rawvalue, viewsdictionary: viewsdictionary) newconstraints += self.newconstraints(visualformat.verticalstackviewformat.rawvalue, viewsdictionary: viewsdictionary) addconstraints(newconstraints) } super.updateconstraints() } private func newconstraints(visualformat: string, viewsdictionary: [string:anyobject]) -> [nslayoutconstraint] { return nslayoutconstraint.constraintswithvisualformat(visualformat, options: [], metrics: nil, views: viewsdictionary) } class viewcontroller: uitableviewcontroller { private let reuseidentifier = "stackcell" private let cellclass = stackcell.self override func viewdidload() { super.viewdidload() configuretableview(self.tableview) } private func configuretableview(tableview: uitableview) { tableview.registerclass(cellclass, forcellreuseidentifier: reuseidentifier) tableview.separatorstyle = .singleline tableview.estimatedrowheight = 88 tableview.rowheight = uitableviewautomaticdimension } private func newlabel(title: string) -> uilabel { let label = uilabel() label.text = title return label } // mark: - uitableview override func numberofsectionsintableview(tableview: uitableview) -> int { return 4 } override func tableview(tableview: uitableview, heightforheaderinsection section: int) -> cgfloat { return 44.0 } override func tableview(tableview: uitableview, numberofrowsinsection section: int) -> int { return 10 } override func tableview(tableview: uitableview, cellforrowatindexpath indexpath: nsindexpath) -> uitableviewcell { let cell = tableview.dequeuereusablecellwithidentifier(reuseidentifier, forindexpath: indexpath) as! stackcell cell.stackview.arrangedsubviews.foreach({$0.removefromsuperview()}) cell.stackview.addarrangedsubview(newlabel("\(indexpath.section)-\(indexpath.row)")) cell.stackview.addarrangedsubview(newlabel("second label")) cell.stackview.addarrangedsubview(newlabel("third label")) cell.stackview.addarrangedsubview(newlabel("fourth label")) cell.stackview.addarrangedsubview(newlabel("fifth label")) return cell } override func tableview(tableview: uitableview, didselectrowatindexpath indexpath: nsindexpath) { let cell = tableview.cellforrowatindexpath(indexpath) as! stackcell (idx, view) in cell.stackview.arrangedsubviews.enumerate() { if idx == 0 { continue } view.hidden = !view.hidden } uiview.animatewithduration(0.3, animations: { cell.contentview.layoutifneeded() tableview.beginupdates() tableview.endupdates() }) } }
it seems work constraints need added in init of uitableviewcell , added contentview instead of cell's view.
the working code looks this:
import uikit class stackcell : uitableviewcell { enum visualformat: string { case horizontalstackviewformat = "h:|[stackview]|" case verticalstackviewformat = "v:|[stackview(>=44)]|" } var hassetupconstraints = false lazy var stackview : uistackview! = { let stack = uistackview() stack.axis = uilayoutconstraintaxis.vertical stack.distribution = .fillproportionally stack.alignment = .fill stack.spacing = 3.0 stack.translatesautoresizingmaskintoconstraints = false stack.setcontentcompressionresistancepriority(uilayoutpriorityrequired, foraxis: .vertical) return stack }() override init(style: uitableviewcellstyle, reuseidentifier: string?) { super.init(style: style, reuseidentifier: reuseidentifier) contentview.addsubview(stackview) addstackconstraints() } required init?(coder adecoder: nscoder) { fatalerror("init(coder:) has not been implemented") } private func addstackconstraints() { let viewsdictionary: [string:anyobject] = ["stackview" : stackview] var newconstraints = [nslayoutconstraint]() newconstraints += self.newconstraints(visualformat.horizontalstackviewformat.rawvalue, viewsdictionary: viewsdictionary) newconstraints += self.newconstraints(visualformat.verticalstackviewformat.rawvalue, viewsdictionary: viewsdictionary) contentview.addconstraints(newconstraints) super.updateconstraints() } private func newconstraints(visualformat: string, viewsdictionary: [string:anyobject]) -> [nslayoutconstraint] { return nslayoutconstraint.constraintswithvisualformat(visualformat, options: [], metrics: nil, views: viewsdictionary) } } 
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