iOS development UI article----UI Basics of Beauty Carousel (Auto-Carousel) 2

////VIEWCONTROLLER.M//Picture Carousel-(automatic)////Created by RMS on 15/11/28.//copyright©2015 year RMS. All rights reserved.//#import "ViewController.h"#defineKimagecount 8@interfaceViewcontroller () <UIScrollViewDelegate>@property (nonatomic,strong) Uiscrollview*ScrollView, @property (nonatomic,strong) Uiimageview*Leftimageview, @property (nonatomic,strong) Uiimageview*Centerimageview, @property (nonatomic,strong) Uiimageview*Rightimageview, @property (nonatomic,strong) Uipagecontrol*Pagecontrol, @property (nonatomic,strong) Nstimer*timer;@end@implementationViewcontroller- (void) viewdidload {[Super viewdidload]; CGFloat width=Self.view.frame.size.width; CGFloat height=Self.view.frame.size.height; Uiscrollview*scrollview =[[Uiscrollview alloc]initwithframe:self.view.bounds];        [Self.view Addsubview:scrollview]; Uipagecontrol*pagecontrol = [[Uipagecontrol alloc]initwithframe:cgrectmake (0, Height- -, Width, -)]; Pagecontrol.numberofpages=Kimagecount; Pagecontrol.currentpageindicatortintcolor=[Uicolor Redcolor]; Pagecontrol.pageindicatortintcolor=[Uicolor Blackcolor];        [Self.view Addsubview:pagecontrol]; Self.pagecontrol=Pagecontrol; Scrollview.contentsize= Cgsizemake (Width * (kimagecount +2),0); Scrollview.contentoffset= Cgpointmake (width,0); Scrollview.pagingenabled=YES; Self.scrollview=ScrollView; ScrollView.Delegate=Self ; //31231[Self Imageviewwithframe:cgrectmake (0,0, width, height) imagename:[nsstring stringWithFormat:@"%02d", Kimagecount]]; [Self imageviewwithframe:cgrectmake (width* (Kimagecount +1),0, width, height) ImageName:@"01.jpg"];  for(inti =1; I < Kimagecount +1; i++) {[Self imageviewwithframe:cgrectmake (widthI0, width, height) imagename:[nsstring stringWithFormat:@"%02d", I]]; } [self Starttimer];}-(Uiimageview *) Imageviewwithframe: (CGRect) frame imageName: (NSString *) imagename{Uiimageview*imageview =[[Uiimageview alloc]initwithframe:frame]; Imageview.image=[UIImage Imagenamed:imagename]; Imageview.contentmode=Uiviewcontentmodescaleaspectfit; Imageview.clipstobounds=YES;    [Self.scrollview Addsubview:imageview]; returnImageView;}/turn on a new timer- (void) starttimer{//Timer//scheduled scheduling (execution)//Interval interval of time (s)//Target Destination (whose method is called)//Selector Method (which method to call)//repeats do I need to repeat//did two things. 1. Create an Nstimer object//2. This nstimer is added to the main run loop by default (the default priority is lower than the priority of event handling)//Self.timer = [Nstimer scheduledtimerwithtimeinterval:2 target:self selector: @selector (nextimage) Userinfo:nil Rep    Eats:yes]; //1. Create a Nstimer objectNstimer *timer = [Nstimer timerwithtimeinterval:2target:self selector: @selector (nextimage) Userinfo:nil Repeats:yes];//2. Adding to the main run cycle//Run Loop Loop//nsdefaultrunloopmode default mode (less than event-handling priority)//Nsrunloopcommonmodes General-purpose mode (same as priority for event handling)[[Nsrunloop Mainrunloop] Addtimer:timer formode:nsrunloopcommonmodes]; //3. Record the current timerSelf.timer =timer;}-(void) nextimage{Nsinteger page=Self.pageControl.currentPage; if(page = = Self.pageControl.numberOfPages-1) {page=0;//[UIView animatewithduration:1 animations:^{Self.scrollView.contentOffset = Cgpointmake (Self.scrollView.frame.size.width * (page+1),0);//        }];    }Else{page++; [UIView animatewithduration:1animations:^{Self.scrollView.contentOffset= Cgpointmake (Self.scrollView.frame.size.width * (page+1),0);            }]; }    }- (void) Scrollviewwillbegindragging: (Uiscrollview *) scrollview{//Stop Timer//Let the timer fail, once the failure is not in use. [Self.timer invalidate];}/** * Perform this method when the user's finger is lifted from the Scrollviwew*/- (void) Scrollviewdidenddragging: (Uiscrollview *) ScrollView willdecelerate: (BOOL) decelerate{//start the dispatch again[self starttimer]; }-(void) Scrollviewdidscroll: (Uiscrollview *) scrollview{cgpoint offset=Scrollview.contentoffset; intpage = round (Offset.x/scrollView.frame.size.width); NSLog (@"%d", page); Self.pageControl.currentPage= Page-1; if(page = = Kimagecount +1) {Scrollview.contentoffset= Cgpointmake (ScrollView.frame.size.width,0); }    if(page = =0) {Scrollview.contentoffset= Cgpointmake (ScrollView.frame.size.width * Kimagecount,0); }}@end

iOS development UI article----UI Basics of Beauty Carousel (Auto-Carousel) 2