Swift Development-Auto-Carousel diagram (Uiscrollview+uipagecontrol+timer)

Relatively simple, the principle is not said, here only record:

The code is as follows:

1, prepare

var pagecontrol:uipagecontrol?var myscrollview:uiscrollview?var mytimer:timer?var mycurrentpage:nsinteger?var courses= [        ["name":" First","pic":"1.jpeg"],        ["name":"Second","pic":"2.jpeg"],        ["name":"Third","pic":"3.jpeg"]    ]

2, content add-on

// Add ScrollView         Self.addscrollview ()        // add picture         self.addimages ()        //  Add Pagecontrol        self.addpagecontrol ()                1                //  Add Timer        Self.setuptimer ()

Specific methods:

func Addscrollview () {Self.myscrollview=Uiscrollview () Self.myscrollview?. frame = CGRect (x:0Y:0, width:kscreenwidth,height:kscreenheight/2) Self.myscrollview?. Contentsize = Cgsize (width:kscreenwidth*3, height:kscreenheight/2) Self.myscrollview?. Showshorizontalscrollindicator =falseSelf.myscrollview?. Showsverticalscrollindicator =falseSelf.myscrollview?. Scrollstotop =falseSelf.myscrollview?.Delegate=Self self.myscrollview?. ispagingenabled =trueSelf.view.addSubview (Self.myscrollview!)} func addimages () {Let size= Self.myscrollview?. Bounds.size for(Seq,course)inchcourses.enumerated () {let page= UIView (Frame:cgrect (x:0Y: -, width:kscreenwidth,height:kscreenheight/2)) Let ImageView=uiimageview (Image:uiimage (named:course["pic"]!)) Imageview.frame=page.frame Page.addsubview (imageView) Page.backgroundcolor=Uicolor.gray let Lab1= UILabel (Frame:cgrect (x: the, y:kscreenheight/2- -, width:kscreenwidth- -, Height: +)) Lab1.textalignment=. Center Lab1.backgroundcolor=uicolor.red Lab1.text= course["name"] Page.addsubview (LAB1) page.frame= CGRect (x:cgfloat (SEQ) * (size?. width)!,y:0, Width: (size?. width)!,height: (size?. Height)!) Self.myscrollview?. Addsubview (page)}} Func Addpagecontrol () {Self.pagecontrol= Uipagecontrol (Frame:cgrect (x:kscreenwidth/2- -/2, y:kscreenheight/2- +, Width: -, Height: *)) Self.pagecontrol?. BackgroundColor =Uicolor.blue Self.pagecontrol?. Numberofpages =courses.count Self.view.addSubview (Self.pagecontrol!)} func Setuptimer () {Self.mytimer= Timer.init (timeinterval:2.0, Target:self, selector: #selector (timeraction), Userinfo:nil, repeats:true) RunLoop.main.add (Self.mytimer!, ForMode:RunLoopMode.defaultRunLoopMode)//DispatchQueue.main.asyncAfter (Deadline:DispatchTime.now () + 2) {//Self.mytimer?. Fire ()//        }} func Closetimer () {Self.mytimer?. Invalidate () Self.mytimer=Nil} func timeraction () {Self.pagecontrol?. CurrentPage + = mycurrentpage!ifSelf.pagecontrol?. CurrentPage = =0|| Self.pagecontrol?. CurrentPage = =2{mycurrentpage=-mycurrentpage!} Self.myscrollview?. Contentoffset = Cgpoint (X:cgfloat (kscreenwidth) *cgfloat (Pagecontrol?. currentpage)!), Y:0)    }

3, some proxy method implementation, manually drag the time, destroy the timer, save memory

Internal Func scrollviewdidenddecelerating (_ Scrollview:uiscrollview) {        = Int (scrollview.contentoffset.x/  ScrollView.frame.size.width)        Self.pagecontrol? currentpage = page            }        func scrollviewwillbegindragging (_ Scrollview:uiscrollview) {        Self.closetimer ( )    }        func scrollviewdidenddragging (_ Scrollview:uiscrollview, Willdecelerate decelerate:bool) {        Self.setuptimer ()    }        func scrollviewwillbegindecelerating (_ Scrollview:uiscrollview) {        Self.pagecontrol?. CurrentPage = Int (scrollview.contentoffset.x/kscreenwidth)    }

The effect is as follows:

Swift Development-Auto-Carousel diagram (Uiscrollview+uipagecontrol+timer)