Swift Development Note 11

Pay attention to judging the condition,

Override Func Prepare (for Segue: Uistoryboardsegue, sender: any ?) {

if let cell = sender as ? Uicollectionviewcell,

Let Indexpath = CollectionView?. Indexpath (For:cell),

Let Managepageviewcontroller = Segue. destination as ? Managepageviewcontroller {

Managepageviewcontroller. photos = photos

Managepageviewcontroller. currentindex = Indexpath. Row

}

}

}

Uipageviewcontroller usage

If let viewcontroller = Viewphotocommentcontroller (index: currentindex?? 0) {

Let viewcontrollers = [Viewcontroller]

Setviewcontrollers (

Viewcontrollers,

Direction:. forward,

Animated: false,

Completion: Nil

)

}

VC from Storyboard, initialization method

fileprivate func viewphotocommentcontroller (index: Int), Photocommentviewcontroller? {

if let storyboard = Storyboard,

Let page = Storyboard. Instantiateviewcontroller (withidentifier: "Photocommentviewcontroller")

as? Photocommentviewcontroller {

Page. photoname = Photos[index]

Page. Photoindex = Index

return page

}

return Nil

}

//  Uipageviewcontrollerdatasource

Extension managepageviewcontroller: Uipageviewcontrollerdatasource {

Func Pageviewcontroller (_ Pageviewcontroller: Uipageviewcontroller, Viewcontrollerbefore ViewController : uiviewcontroller), Uiviewcontroller? {

if let viewcontroller = Viewcontroller as ? Photocommentviewcontroller {

Guard Let index = Viewcontroller. Photoindex, Index! = 0 else {

return Nil

}

return Viewphotocommentcontroller(Index:index- 1)

}

return Nil

}

Func Pageviewcontroller (_ Pageviewcontroller: uipageviewcontroller, Viewcontrollerafter ViewController: Uiviewcontroller, Uiviewcontroller? {

if let viewcontroller = Viewcontroller as ? Photocommentviewcontroller {

Guard Let index = Viewcontroller. Photoindex, index ! = photos. Count- 1 else {

return Nil

}

return Viewphotocommentcontroller(index:index + 1)

}

return Nil

}

Mark:uipagecontrol

func Presentationcount (for Pageviewcontroller: uipageviewcontroller), Int {

return photos. Count

}

func Presentationindex (for Pageviewcontroller: uipageviewcontroller), Int {

return currentindex ?? 0

}

}

Initialize Selector

Fileprivate extension Selector {

static let Keyboardwillshowhandler = #selector (photocommentviewcontroller.keyboardwillshow ( Notification:))

static let Keyboardwillhidehandler = #selector (photocommentviewcontroller.keyboardwillhide ( Notification:))

static let generaltap = #selector(Photocommentviewcontroller. Dismisskeyboard)

static let Zoomtap = #selector (photocommentviewcontroller.openzoomingcontroller (sender:))

}

Uiscrollviewdelegate

func viewforzooming (in ScrollView: uiscrollview), UIView? {

return Myimageview

}

Func Scrollviewdidzoom (_ ScrollView: uiscrollview) {

updateconstraints (forsize: view. Bounds. size)

}

Swift Development Note 11