OBJECTIVE-C implementation of Infinite cycle carousel _ios

First look at the effect chart:

Specific implementation code:

1. Controller

APPDELEGATE.M//Infinite carousel///Created by Zhangmi on 16/5/16. COPYRIGHT©2016 year Paramount Pictures.
All rights reserved. #import "ViewController.h" #import "SNInfiniteScrollView.h" @interface Viewcontroller () @end @implementation Vie
 Wcontroller-(void) viewdidload {[Super viewdidload];
  
 Do no additional setup after loading the view, typically from a nib.
 Nsmutablearray * images = [Nsmutablearray array]; for (int i = 0; i < 5; i++) {NSString * imagename = [NSString stringwithformat:@ "ad_%02d", I];//img01 uiimage * I
  Mage = [UIImage imagenamed:imagename];
 [Images Addobject:image]; UIView * ScrollView = [Sninfinitescrollview scrollviewwithframe:cgrectmake (0, 414, MB) SuperView:self.view images: Images scrolldirection:scrolldirectionhorizontal Pageindicatortintcolor:[uicolor Lightgraycolor]
  
 Currentpageindicatortintcolor:[uicolor Orangecolor] Imageviewcontentmode:uiviewcontentmodescaleaspectfit];
[Self.view Addsubview:scrollview]; } @enD
 

2. Display content interface settings

APPDELEGATE.M//Infinite carousel///Created by Zhangmi on 16/5/16. COPYRIGHT©2016 year Paramount Pictures.
All rights reserved.
#import "SNInfiniteScrollView.h" static int const IMAGEVIEWCOUNT = 3;
 
#define SCROLLVIEWWIDTH self.scrollView.frame.size.width #define Scrollviewheight self.scrollView.frame.size.height
@interface Sninfinitescrollview () <UIScrollViewDelegate> @property (weak, nonatomic) Uiscrollview * ScrollView;
@property (Weak, nonatomic) Nstimer * TIMER;
 
/** PageIndex * * * @property (nonatomic, assign) Nsinteger PageIndex; 
  
 @end @implementation Sninfinitescrollview-(void) SetImages: (nsarray<uiimage *> *) Images {_images = images;
  
 Set page number Self.pageindex = 0;
  
 Set content [self updatecontent];
Start timer [self starttimer]; Called when the code was created/**. */-(Instancetype) initWithFrame: (CGRect) Frame {if (self = [Super Initwithframe:frame]) {//scrolling view Uiscrollview * SCR
   
  Ollview = [[Uiscrollview alloc] init];
  Self.scrollview = ScrollView; SCrollview.delegate = self;
  scroller attribute scrollview.showshorizontalscrollindicator = NO;
  Scrollview.showsverticalscrollindicator = NO;
  scrollview.pagingenabled = YES;
  Scrollview.bounces = NO;
   
  Add ScrollView [self addsubview:scrollview];
   Picture control for (int i = 0; i < Imageviewcount i++) {Uiimageview * ImageView = [[Uiimageview alloc] init];
   The picture does not distort processing.
   Imageview.contentmode = Self.imageviewcontentmode;
  [ScrollView Addsubview:imageview];
} return self;
  
 /** The Layout child control, only one time/(void) layoutsubviews {[Super layoutsubviews] is executed;
 Self.scrollView.frame = Self.bounds; if (self.scrolldirection = = scrolldirectionvertical) {self.scrollView.contentSize = Cgsizemake (0, Imageviewcount * Self
 . bounds.size.height);
 else {self.scrollView.contentSize = Cgsizemake (imageviewcount * self.bounds.size.width, 0);
   
  for (int i = 0; i < Imageviewcount i++) {Uiimageview * ImageView = self.scrollview.subviews[i]; if (self.scrolldirection = =scrolldirectionvertical) {imageview.frame = CGRectMake (0, I * self.scrollView.frame.size.height, Self.scrollView.fram
  E.size.width, Self.scrollView.frame.size.height); else {imageview.frame = CGRectMake (i * self.scrollView.frame.size.width, 0, Self.scrollView.frame.size.width, SELF.S
  CrollView.frame.size.height);
}//set content [self updatecontent];
   
  #pragma mark-Content update-(void) Updatecontent {//Set picture for (int i = 0; i < Self.scrollView.subviews.count; i++) {
  Nsinteger pageIndex = Self.pageindex;
   
  Traverse each imageview Uiimageview * ImageView = self.scrollview.subviews[i];
  if (i = = 0) {pageindex--;
  else if (i = = 2) {pageindex++;
  } if (PageIndex < 0) {pageIndex = self.images.count-1;
  else if (PageIndex >= self.images.count) {pageIndex = 0;
  ///The picture angle is assigned to ImageView's tag imageview.tag = PageIndex;
 Imageview.image = Self.images[imageview.tag]; //Set offset in the middle//cannot use the LED drawing Contentoffset if (self.scrolldirection = =scrolldirectionvertical) {self.scrollView.contentOffset = Cgpointmake (0, scrollviewheight);
 else {self.scrollView.contentOffset = Cgpointmake (scrollviewwidth, 0);
 #pragma mark-<UIScrollViewDelegate>-(void) Scrollviewdidscroll: (Uiscrollview *) ScrollView {//Find the middle of the picture control
 Nsinteger page = Self.pageindex;
 Cgpoint point = Cgpointzero;
  for (int i = 0; i < Self.scrollView.subviews.count i++) {Uiimageview * ImageView = self.scrollview.subviews[i];
  Point = [ScrollView convertPoint:imageView.frame.origin ToView:self.superview]; =****** Other Way ****************** stone * * * if (self.scrolldirection = = scrolldirectionvertical) {if (ABS)
   . Y-SELF.FRAME.ORIGIN.Y) < 1.0) {page = Imageview.tag;
   } else {if (ABS (point.x-self.frame.origin.x) < 1.0) {page = Imageview.tag;
 }} self.pageindex = page;
  
 self.pageControl.currentPage = page;
 The drag end invokes [self updatecontent]; #warning Mark-No animation is normal, there is no animation, has always been the original point//[Self updatecontent]; No animation normal, there is animation does not move, has been the origin of the/** start drag-(void) scrollviewwillbegindragging: (Uiscrollview *) ScrollView {//stop timer [self s
Toptimer]; /** End Drag/-(void) scrollviewdidenddragging: (Uiscrollview *) ScrollView willdecelerate: (BOOL) decelerate {//open timer [SE
LF Starttimer];
 /** deceleration complete/-(void) scrollviewdidenddecelerating: (Uiscrollview *) ScrollView {//update content, if contentoffset do not take the animation words do not go this way
[Self updatecontent]; /** End Rolling Animation///This is insurance practice ... If the contentoffset does not go with animation, this method-(void) Scrollviewdidendscrollinganimation: (Uiscrollview *) ScrollView {//update content [self UPDA
Tecontent]; #pragma mark-timer processing-(void) Starttimer {nstimer * timer = [Nstimer scheduledtimerwithtimeinterval:1.0 Target:sel
 F selector: @selector (Next:) Userinfo:nil Repeats:yes];
 [[Nsrunloop Mainrunloop] Addtimer:timer formode:nsrunloopcommonmodes];
 [[Nsrunloop Currentrunloop] Addtimer:timer formode:nsrunloopcommonmodes];
Self.timer = timer;
}-(void) Stoptimer {[Self.timer invalidate]; Self.timer = nil; }-(void) Next: (Nstimer *) Timer {if (self.scrolldirection = = scrolldirectionvertical) {[Self.scrollview Setcontento
 Ffset:cgpointmake (0, 2 * self.scrollView.frame.size.height) Animated:yes];
 else {[Self.scrollview setcontentoffset:cgpointmake (2 * self.scrollView.frame.size.width, 0) Animated:yes]; }//=****** Simple Call ****************** stone + (instancetype) Scrollviewwithframe: (CGRect) frame Superview: (UIView *) Superview images: (nsarray<uiimage *> *) images scrolldirection: (scrolldirection) scrolldirection Pageindicatortintcolor: (Uicolor *) Pageindicatortintcolor Currentpageindicatortintcolor: (UIColor *) Currentpageindicatortintcolor Imageviewcontentmode: (uiviewcontentmode) Imageviewcontentmode {//=******
 Add Custom ScrollView ****************** stone * sninfinitescrollview * ScrollView = [[Sninfinitescrollview alloc] init];
 Scrollview.frame = frame;
 Scrollview.imageviewcontentmode = Imageviewcontentmode; Scrollview.scrolldirection = ScrolldirectIon
 =****** Add Image ****************** Stone * * * scrollview.images = images;
 =****** add Pagecontrol ****************** stone uipagecontrol * Pagecontrol = [[Uipagecontrol alloc] init];
 Scrollview.pagecontrol = Pagecontrol;
 pagecontrol.enabled = NO;
 Pagecontrol.currentpageindicatortintcolor = Currentpageindicatortintcolor;
 Pagecontrol.pageindicatortintcolor = Pageindicatortintcolor;
 Pagecontrol.numberofpages = ScrollView.images.count;
 Pagecontrol.bounds = CGRectMake (0, 0, ScrollView.bounds.size.width, 44);
 Pagecontrol.center = Cgpointmake (scrollView.bounds.size.width * 0.5, scrollView.bounds.size.height * 0.9);
 [ScrollView Addsubview:pagecontrol];
 [Superview Addsubview:scrollview];
=************************ Stone * * * return scrollview;
 } @end

The above is the entire content of this article, I hope to help you learn.