Implementation steps of the Carousel diagram

1>.h declaring properties

@interface**pagecontrol;

2>.M implementation Steps

@implementationRootview-(Instancetype) initWithFrame: (cgrect) frame{ Self=[Super Initwithframe:frame]; if(self) {//Add a child view[self addallviews]; }    returnSelf ;}//Add a child view- (void) addallviews{//Layout ScrollView//1. Create an ObjectSelf.scrollview =[[Uiscrollview alloc] initWithFrame:self.frame]; //2. Defining Attributes//Apple 4s allocated memory: 30W 5s:80w 6s:100; //Set Scrolling rangeSelf.scrollView.contentSize = Cgsizemake (Cgrectgetwidth (self.frame) *7,0); //put 7 pictures on the ScrollView     for(inti =0; I <7; i + +) {Uiimageview*imageview = [[Uiimageview alloc] Initwithframe:cgrectmake (cgrectgetwidth (self.frame) * I,0, Cgrectgetwidth (Self.frame), Cgrectgetheight (Self.frame))]; NSString*name = [NSString stringWithFormat:@"%d.png", i +Ten]; Imageview.image=[UIImage Imagenamed:name]; //add ImageView to ScrollView[Self.scrollview Addsubview:imageview]; }    //set the entire page slideself.scrollView.pagingEnabled =YES; //3. Add to Parent View[self addSubview:self.scrollView]; //Layout PagecontrolSelf.pagecontrol = [[Uipagecontrol alloc] Initwithframe:cgrectmake (0, Cgrectgetheight (Self.frame)- +, Cgrectgetwidth (Self.frame), +)]; Self.pageControl.backgroundColor=[Uicolor Graycolor]; //number of small dotsSelf.pageControl.numberOfPages =7; //number of current small dotsSelf.pageControl.currentPageIndicatorTintColor =[Uicolor Redcolor]; //no small dots to be selectedSelf.pageControl.pageIndicatorTintColor =[Uicolor Lightgraycolor];    [Self AddSubview:self.pageControl]; }

3> set in ViewcontrollerUiscrollviewThe agent delegate and givesUipagecontrolAdd Event

@interfaceRootviewcontroller () <UIScrollViewDelegate>@property (nonatomic, strong) Rootview*Rootview;@end@implementationRootviewcontroller- (void) loadview{Self.rootview=[[Rootview alloc] Initwithframe:[uiscreen mainscreen].bounds]; Self.view=Self.rootview;}- (void) viewdidload {[Super viewdidload]; //Do any additional setup after loading the view. //4. Setting up the agentSelf.rootView.scrollView.Delegate=Self ; //add an event to Pagecontrol[Self.rootView.pageControl addtarget:self Action: @selector (Pagecontrolclick:) forControlEvents:        Uicontroleventvaluechanged]; //Start adding timers for automatic scrolling[Nstimer Scheduledtimerwithtimeinterval:2target:self selector: @selector (timeaction:) Userinfo:nil Repeats:yes]; }//Implement automatic scrolling- (void) Timeaction: (Nstimer *) time{NSLog (@"timed"); //get current Pagecontrol (pages)Nsinteger index =Self.rootView.pageControl.currentPage; //if it's not the last page, offset one page backwards    if(Index! = self.rootView.pageControl.numberOfPages-1) {Index++; } Else if(Index = = self.rootView.pageControl.numberOfPages-1){        //If this is the last page, skip to the first pageindex =0; }     //to modify the offset of a scrollview by index//Self.rootView.scrollView.contentOffset = cgpointmake (Index * cgrectgetwidth (Self.view.frame), 0);[Self.rootView.scrollView setcontentoffset:cgpointmake (Index * cgrectgetwidth (self.view.frame),0) Animated:yes]; Self.rootView.pageControl.currentPage=index;}//Implement the Click Pagecontrol method- (void) Pagecontrolclick: (Uipagecontrol *) pagecontrol{//Small dot positionNsinteger Currentindex =Self.rootView.pageControl.currentPage; //Self.rootView.scrollView.contentOffset = Cgpointmake (currentindex * self.view.frame.size.width, 0);[UIView animatewithduration:0.5animations:^{Self.rootView.scrollView.contentOffset= Cgpointmake (Currentindex * self.view.frame.size.width,0); }];}//Implementing Proxy Methods- (void) Scrollviewdidenddecelerating: (Uiscrollview *) scrollview{//change the current display position of the Pagecotrol//get the current display locationCGFloat CurrentX =Self.rootview.scrollview.contentoffset.x; Self.rootView.pageControl.currentPage= CurrentX/Self.view.frame.size.width; }

Implementation steps of the Carousel diagram