iOS picture Carousel

Directly on the code, relatively simple. Demo: Demo

uyviewcontroller.m//Picture Carousel////Created by Jiangys on 15/5/23.//Copyright (c) 2015 Uxiaoyuan. All rights reserved.//#import "UYViewController.h" #define Kimagecount 5@interface Uyviewcontroller () < Uiscrollviewdelegate> @property (Nonatomic,strong) Uiscrollview *scrollview; @property (Nonatomic,strong) Uipagecontrol *pagecontrol; @property (nonatomic, strong) Nstimer *timer; @end @implementation uyviewcontroller-( Uiscrollview *) scrollview{if (_scrollview==nil) {//if blank, create a _scrollview=[[uiscrollview alloc] Initwith        Frame:cgrectmake (10, 20, 300, 130)];                _scrollview.backgroundcolor=[uicolor Redcolor];                Cancel the spring effect _scrollview.bounces=no;        Remove horizontal ScrollBar _scrollview.showshorizontalscrollindicator = NO;                _scrollview.showsverticalscrollindicator = NO;                to paging _scrollview.pagingenabled = YES; Contentsize _scrollview.contentsize = Cgsizemake (Kimagecount * _scrollview.bounds.Size.width, 0);                Set proxy _scrollview.delegate = self;                         [Self.view Addsubview:_scrollview]; } return _scrollview;} -(Uipagecontrol *) pagecontrol{if (_pagecontrol = = nil) {//pagination control, essentially without any relationship to ScrollView, is two separate controls _pagecon        Trol = [[Uipagecontrol alloc] init];        Total pages _pagecontrol.numberofpages = Kimagecount;                Control size Cgsize size = [_pagecontrol sizefornumberofpages:kimagecount];        _pagecontrol.bounds = CGRectMake (0, 0, size.width, size.height);                _pagecontrol.center = Cgpointmake (self.view.center.x, 130);        Set color _pagecontrol.pageindicatortintcolor = [Uicolor Redcolor];                _pagecontrol.currentpageindicatortintcolor = [Uicolor blackcolor];                [Self.view Addsubview:_pagecontrol]; Adding a listening method/** in OC, the vast majority of "controls" can listen for uicontroleventvaluechanged events, except for button "/[_pagecontrol addtarget:self ACTI On: @selector (PagechaNged:) forcontrolevents:uicontroleventvaluechanged]; } return _pagecontrol;} How to listen for paging controls-(void) pagechanged: (Uipagecontrol *) page{//Depending on the number of pages, adjust the position of the picture in the scrolling view contentoffset cgfloat x = page.currentpa    GE * SELF.SCROLLVIEW.BOUNDS.SIZE.WIDTH; [Self.scrollview setcontentoffset:cgpointmake (x, 0) Animated:yes];} -(void) viewdidload{[super viewdidload];//set picture for (int i=0; i<kimagecount; i++) {nsstring *imagename=[n        Sstring stringwithformat:@ "img_%02d", i+1];                UIImage *image=[uiimage Imagenamed:imagename];        Uiimageview *imageview=[[uiimageview alloc] initWithFrame:self.scrollView.bounds];                Imageview.image=image;    [Self.scrollview Addsubview:imageview]; }//Calculate ImageView [Self.scrollView.subviews enumerateobjectsusingblock:^ (Uiimageview *imageview, Nsuinteger idx, BOOL        *stop) {//Adjustment X = origin = frame CGRect frame = imageview.frame;                frame.origin.x = idx * frame.size.width; ImageView. frame = frame;        }];        The initial page number of pages is 0 self.pageControl.currentPage = 0;    Start clock [self starttimer]; }-(void) starttimer{Self.timer = [Nstimer timerwithtimeinterval:2.0 target:self selector: @selector (Updatetimer) UserI    Nfo:nil Repeats:yes]; Add to run loop [[[Nsrunloop Currentrunloop] AddTimer:self.timer formode:nsrunloopcommonmodes];}    -(void) updatetimer{//page number changed//(current page + 1)% Total pages int page = (self.pageControl.currentPage + 1)% Kimagecount;    self.pageControl.currentPage = page; Invoke the listener method to let scrolling view scroll [self PageChanged:self.pageControl];}    -(void) didreceivememorywarning{[Super didreceivememorywarning]; Dispose of any resources the can be Recreated.s} #pragma mark-scrollview proxy method//Scroll view to stop, modify the page control's dots (pages)-(void) Scro Llviewdidenddecelerating: (Uiscrollview *) scrollview{//Calculate page int page = Scrollview.contentoffset.x/scrollview.boun        Ds.size.width; self.pageControl.currentPage = page;} /** Modify the mode of the running loop where the clock is located, cannot grasp the picture solution: When you grab the picture, stop the clock, sendAfter sale, turn on the clock */-(void) scrollviewwillbegindragging: (Uiscrollview *) scrollview{//Stop the clock, after the stop can no longer use, if you want to enable the clock, you need to re-instantiate [self.t Imer invalidate];} -(void) scrollviewdidenddragging: (Uiscrollview *) ScrollView willdecelerate: (BOOL) decelerate{[self starttimer];} @end

iOS picture Carousel