uicollectionview - targetContentOffset(forProposedContentOffset:) in my CustomFlowLayout not called -


i writing custom uicollectionviewflowlayout overrides targetcontentoffset(forproposedcontentoffset:) in order provide right contentoffset when user pinch zoom since problem (wrong contentoffset)

dynamically setting layout on uicollectionview causes inexplicable contentoffset change

class timelinecollectionviewflowlayout: uicollectionviewflowlayout {          // mark: - init          override init() {             super.init()             self.minimumlinespacing = 0         }          required init?(coder adecoder: nscoder) {             super.init(coder: adecoder)         }          override func prepare() {             if let collectionview = self.collectionview {                 collectionview.ispagingenabled = false                 self.sectioninset = uiedgeinsets(top: 0, left: 0, bottom: 0, right: 0)                 self.scrolldirection = .horizontal             }         }      override func targetcontentoffset(forproposedcontentoffset proposedcontentoffset: cgpoint) -> cgpoint {         print("hello")         return proposedcontentoffset     } }

but unfortunatly targetcontentoffset not called, have idea why?

thanks!

thierry

try 

override func targetcontentoffset(forproposedcontentoffset proposedcontentoffset: cgpoint, withscrollingvelocity velocity: cgpoint) -> cgpoint

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