iOS development UI Chapter-implement picture Carousel with pure code write

First, the realization effect

Auto-Carousel for images

Second, the implementation of the Code

1 //handwritten picture carousel2 //3 //Created by Xin on 14-10-9.4 //Copyright (c) 2014 Liang. All rights reserved.5 //6 #defineTximagecount 57 8 #import "TXViewController.h"9 Ten  One @interfaceTxviewcontroller () <UIScrollViewDelegate> A { -Uiscrollview *_scrollview; -Uipagecontrol *_pagecontrol; the } -@property (nonatomic, strong) Nstimer *timer; -  - @end +  - @implementationTxviewcontroller +  A- (ID) Initwithnibname: (NSString *) Nibnameornil Bundle: (NSBundle *) Nibbundleornil at { -Self =[Super Initwithnibname:nibnameornil Bundle:nibbundleornil]; -     if(self) { -         //Custom Initialization -     } -     returnSelf ; in } -  to- (void) Viewdidload + { - [Super Viewdidload]; the      *      $_scrollview = [[Uiscrollview alloc]initwithframe:cgrectmake (Ten, -, -, the)];Panax Notoginseng      -     //Some fixed parameters theCGFloat Imagew =_scrollview.frame.size.width; +CGFloat Imageh =_scrollview.frame.size.height; ACGFloat Imagey =0; the_scrollview.backgroundcolor =[Uicolor Blackcolor]; + [Self.view Addsubview:_scrollview]; -      $_scrollview.Delegate=Self ; $     //add five photos to ScrollView -      for(inti =0; i<tximagecount; i++) { -Uiimageview *imageview =[[Uiimageview alloc] init]; the          -         //Set FrameWuyiCGFloat ImageX = i *Imagew; theImageview.frame =CGRectMake (ImageX, Imagey, Imagew, Imageh); -          Wu         //set up a picture -NSString *name = [NSString stringWithFormat:@"img_0%d", i +1]; AboutImageview.image =[UIImage imagenamed:name]; $ [_scrollview Addsubview:imageview]; -          -          -         //Adding Timers A          + [self addtimer]; the          -      $      the     } the     //Add a paging point the_pagecontrol = [[Uipagecontrol alloc]initwithframe:cgrectmake (107, -,106,Panax Notoginseng)]; the_pagecontrol.backgroundcolor=[Uicolor Orangecolor]; -      in     //set total pages for Pagecontrol the      the_pagecontrol.numberofpages =Tximagecount; About      the [_pagecontrol addtarget:self Action: @selector (Changpage) forcontrolevents:uicontroleventvaluechanged]; the [Self.view Addsubview:_pagecontrol]; the     //Set Content size +CGFloat CONTENTW =tximagecount *Imagew; -_scrollview.contentsize = Cgsizemake (CONTENTW,0); the     Bayi     //Hide horizontal scroll bar the_scrollview.showshorizontalscrollindicator =NO; the      -     //page Out -_scrollview.pagingenabled =YES; the      the      the } the /** - * Click Pagecontrol to change ScrollView page the  */ the-(void) Changpage the {94Cgpoint Offest=cgpointmake (_pagecontrol.currentpage*_scrollview.frame.size.width,0); the [_scrollview setcontentoffset:offest animated:yes]; the } the /**98 * Add Timer About  */ --(void) AddTimer101 {102Self.timer = [Nstimer scheduledtimerwithtimeinterval:2.0target:self selector: @selector (nextimage) Userinfo:nil Repeats:yes];103     //increase the priority level104 [[Nsrunloop Currentrunloop] AddTimer:self.timer formode:nsrunloopcommonmodes]; the }106 /**107 * Removal Timer108  */109-(void) Removetimer the {111 [Self.timer invalidate]; theSelf.timer =Nil;113 } the-(void) NextImage the { the     //1. Increase the page number of Pagecontrol117     intpage =0;118     if(_pagecontrol.currentpage ==tximagecount-1) {119page =0; -     }121     Else122     {123page = _pagecontrol.currentpage +1;124     } the     //calculate the position of the Scrolview scroll126CGFloat OffsetX = page *_scrollview.frame.size.width;127Cgpoint offset = Cgpointmake (OffsetX,0); - [_scrollview setcontentoffset:offset animated:yes];129      the }131 #pragmaMark--Proxy method the 133-(void) Scrollviewdidscroll: (Uiscrollview *) ScrollView134 {135     //depending on the scroll position of the ScrollView, Pagecontrol displays the first page136CGFloat SCROLLW =_scrollview.frame.size.width;137     138     intpage = (_SCROLLVIEW.CONTENTOFFSET.X+SCROLLW *0.5)/SCROLLW;139_pagecontrol.currentpage =page; $ }141- (void) didreceivememorywarning142 {143 [Super didreceivememorywarning];144     //Dispose of any resources the can be recreated.145 }146 /**147 * Call when stop dragging148  149  */ Max-(void) Scrollviewdidenddragging: (Uiscrollview *) ScrollView willdecelerate: (BOOL) decelerate151 { the     //Stop timer (once the timer is stopped, it can no longer be used)153 [self addtimer];154 }155 156 /**157 * Call when starting a drag158  */159-(void) Scrollviewwillbegindecelerating: (Uiscrollview *) ScrollView the {161     //Stop timer (once the timer is stopped, it can no longer be used)162 [self removetimer];163 }164 165 166 167 @end

iOS development UI Chapter-implement picture Carousel with pure code write