typedef NS_OPTIONS(NSUInteger, UIViewAutoresizing) {
 UIViewAutoresizingNone   = 0, //不進(jìn)行自動(dòng)調(diào)整
 UIViewAutoresizingFlexibleLeftMargin = 1 << 0, //自動(dòng)調(diào)整與superview左側(cè)距離，右側(cè)距離保持不變
 UIViewAutoresizingFlexibleWidth = 1 << 1, //自動(dòng)調(diào)整控件自身寬度，保證與superview左右距離不變
 UIViewAutoresizingFlexibleRightMargin = 1 << 2, //自動(dòng)調(diào)整與superview右側(cè)距離，左側(cè)距離保持不變
 UIViewAutoresizingFlexibleTopMargin = 1 << 3, //自動(dòng)調(diào)整與superview頂部距離，底部距離保持不變
 UIViewAutoresizingFlexibleHeight = 1 << 4, //自動(dòng)調(diào)整控件自身高度，保證與superview上下距離不變
 UIViewAutoresizingFlexibleBottomMargin = 1 << 5 //自動(dòng)調(diào)整與superview底部距離，頂部距離保持不變
};

//
// AppDelegate.m
// UIViewAndUIScrollView
//
// Created by Kenshin Cui on 14-2-23.
// Copyright (c) 2014年 Kenshin Cui. All rights reserved.
//

#import "AppDelegate.h"
#import "KCMainViewController.h"
#import "KCTransformViewController.h"

@interface AppDelegate ()

@end

@implementation AppDelegate
  

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
 
 self.window=[[UIWindow alloc]initWithFrame:[UIScreen mainScreen].applicationFrame];
 
 KCMainViewController *mainController=[[KCMainViewController alloc]init];
 self.window.rootViewController=mainController;
 self.window.backgroundColor=[UIColor colorWithRed:249/255.0 green:249/255.0 blue:249/255.0 alpha:1];

 [self.window makeKeyAndVisible];
 
 return YES;
}

- (void)applicationWillResignActive:(UIApplication *)application {
 // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
 // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
}

- (void)applicationDidEnterBackground:(UIApplication *)application {
 // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
 // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}

- (void)applicationWillEnterForeground:(UIApplication *)application {
 // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
}

- (void)applicationDidBecomeActive:(UIApplication *)application {
 // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}

- (void)applicationWillTerminate:(UIApplication *)application {
 // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}

@end

//
// KCMainViewController.m
// UIViewAndUIScrollView
//
// Created by Kenshin Cui on 14-2-23.
// Copyright (c) 2014年 Kenshin Cui. All rights reserved.
//

#import "KCMainViewController.h"

@interface KCMainViewController (){
 UIButton *_btn; //私有變量
}

@end

@implementation KCMainViewController

- (void)viewDidLoad {
 [super viewDidLoad];
 
 //添加一個(gè)Button
 _btn=[[UIButton alloc]initWithFrame:CGRectMake(60, 100, 200, 50)];
 _btn.backgroundColor=[UIColor orangeColor];
 [_btn setTitle:@"Hello,world!" forState:UIControlStateNormal];
 _btn.autoresizingMask=UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleLeftMargin;
 [self.view addSubview:_btn];
 
}

#pragma mark 屏幕旋轉(zhuǎn)事件
-(void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation{
 NSLog(@"%@",NSStringFromCGRect(_btn.frame));
}
@end

//
// KCTransformViewController.m
// UIViewAndUIScrollView
//
// Created by Kenshin Cui on 14-2-23.
// Copyright (c) 2014年 Kenshin Cui. All rights reserved.
//

#import "KCTransformViewController.h"
//定義rgb顏色
#define NORMAL_COLOR [UIColor colorWithRed:75/255.0 green:160/255.0 blue:253/255.0 alpha:1]
#define HIGHLIGHTED_COLOR [UIColor colorWithRed:197/255.0 green:221/225.0 blue:249/225.0 alpha:1]
//按鈕操作
typedef void(^ ButtonHandle)();

@interface KCTransformViewController (){
 UIImageView *_imageView;//圖片控件
 UIButton *_btnRotation;//旋轉(zhuǎn)按鈕
 UIButton *_btnScale;//縮放按鈕
 UIButton *_btnTranslate;//移動(dòng)按鈕
}

@end

@implementation KCTransformViewController

- (void)viewDidLoad {
 [super viewDidLoad];
 
 [self addImageView];
 [self addRotationButton];
 [self addScaleButton];
 [self addTranslateButton];
 
}

#pragma mark 添加圖片控件
-(void)addImageView{
 //直接使用圖片名稱(chēng)，系統(tǒng)會(huì)自動(dòng)到資源文件中找到對(duì)應(yīng)的文件
 UIImage *image=[UIImage imageNamed:@"promo_ios8.png"];
 //如果使用initWithImage進(jìn)行初始化則控件大小會(huì)自動(dòng)設(shè)置成圖片大小
 _imageView=[[UIImageView alloc]initWithImage:image];
 _imageView.frame=CGRectMake(20, 20, 280, 154);
 //設(shè)置內(nèi)容填充模式為等比例填充
 _imageView.contentMode=UIViewContentModeScaleAspectFit;
 //self.view就是每個(gè)視圖控制器中的view屬性
 [self.view addSubview:_imageView];
}

#pragma mark 添加旋轉(zhuǎn)按鈕
-(void)addRotationButton{
 _btnRotation=[self getButton];
 _btnRotation.frame=CGRectMake(20, 400, 280, 30);
 [_btnRotation setTitle:@"旋轉(zhuǎn)" forState:UIControlStateNormal];
 //添加按鈕點(diǎn)擊事件
 [_btnRotation addTarget:self action:@selector(rotation:) forControlEvents:UIControlEventTouchUpInside];
 [self.view addSubview:_btnRotation];
}

#pragma mark 添加縮放按鈕
-(void)addScaleButton{
 //在上面一個(gè)按鈕位置的基礎(chǔ)上確認(rèn)當(dāng)前位置
 CGRect scaleButtonFrame=_btnRotation.frame;
 scaleButtonFrame.origin.y+=40;
 _btnScale =[self getButton];
 _btnScale.frame=scaleButtonFrame;
 [_btnScale setTitle:@"縮放" forState:UIControlStateNormal];
 //添加按鈕點(diǎn)擊事件
 [_btnScale addTarget:self action:@selector(scale:) forControlEvents:UIControlEventTouchUpInside];
 [self.view addSubview:_btnScale];
}

#pragma mark 添加移動(dòng)按鈕
-(void)addTranslateButton{
 CGRect translateButtonFrame=_btnScale.frame;
 translateButtonFrame.origin.y+=40;
 _btnTranslate =[self getButton];
 _btnTranslate.frame=translateButtonFrame;
 [_btnTranslate setTitle:@"移動(dòng)" forState:UIControlStateNormal];
 [_btnTranslate addTarget:self action:@selector(translate:) forControlEvents:UIControlEventTouchUpInside];
 [self.view addSubview:_btnTranslate];
 
}

#pragma mark 圖片旋轉(zhuǎn)方法,注意參數(shù)中的btn表示當(dāng)前點(diǎn)擊按鈕
-(void)rotation:(UIButton *)btn{
 [self animation:^{
 //注意旋轉(zhuǎn)角度必須是弧度，不是角度
 CGFloat angle=M_PI_4;//M開(kāi)頭的宏都是和數(shù)學(xué)（Math）相關(guān)的宏定義，M_PI_4表示四分之派，M_2_PI表示2派
 //使用CGAffineTransformMakeRotation獲得一個(gè)旋轉(zhuǎn)角度形變
 //但是需要注意tranform的旋轉(zhuǎn)不會(huì)自動(dòng)在原來(lái)的角度上進(jìn)行疊加，所以下面的方法旋轉(zhuǎn)一次以后再點(diǎn)擊按鈕不會(huì)旋轉(zhuǎn)了
 //_imageView.transform=CGAffineTransformMakeRotation(angle);
 //利用CGAffineTransformRotate在原來(lái)的基礎(chǔ)上產(chǎn)生一個(gè)新的角度(當(dāng)然也可以定義一個(gè)全局變量自己累加)
 _imageView.transform=CGAffineTransformRotate(_imageView.transform, angle);
 
 }];
}

#pragma mark 圖片縮放方法
-(void)scale:(UIButton *)btn{
// [self animation:^{
// CGFloat scalleOffset=0.9;
// //_imageView.transform=CGAffineTransformMakeScale(scalleOffset, scalleOffset);
// _imageView.transform= CGAffineTransformScale(_imageView.transform, scalleOffset, scalleOffset);
// }];
 //通常我們使用UIView的靜態(tài)方法實(shí)現(xiàn)動(dòng)畫(huà)而不是自己寫(xiě)一個(gè)方法
 [UIView animateWithDuration:0.5 animations:^{
 CGFloat scalleOffset=0.9;
 //_imageView.transform=CGAffineTransformMakeScale(scalleOffset, scalleOffset);
 _imageView.transform= CGAffineTransformScale(_imageView.transform, scalleOffset, scalleOffset);
 }];
}

#pragma mark 圖片移動(dòng)方法
-(void)translate:(UIButton *)btn{
 [self animation:^{
 CGFloat translateY=50;
 //_imageView.transform=CGAffineTransformMakeTranslation(0, translateY);
 _imageView.transform=CGAffineTransformTranslate(_imageView.transform, 0, translateY);
 }];
}

#pragma mark 動(dòng)畫(huà)執(zhí)行方法，注意這里可以使用UIView的animateWithDuration方法代替這里只是為了演示
-(void)animation:(ButtonHandle)handle{
 //開(kāi)始動(dòng)畫(huà)
 [UIView beginAnimations:@"animation" context:nil];
 //設(shè)置動(dòng)畫(huà)執(zhí)行時(shí)間
 [UIView setAnimationDuration:0.5];
 
 handle();
 
 //執(zhí)行動(dòng)畫(huà)操作
 [UIView commitAnimations];
 
}

#pragma mark 取得一個(gè)按鈕,統(tǒng)一按鈕樣式
-(UIButton *)getButton{
 UIButton *button =[[UIButton alloc]init ];
 //設(shè)置正常狀態(tài)下字體顏色
 [button setTitleColor:NORMAL_COLOR forState:UIControlStateNormal];
 //設(shè)置高亮狀態(tài)下的字體顏色
 [button setTitleColor:HIGHLIGHTED_COLOR forState:UIControlStateHighlighted];
 return button;
}

@end

//
// KCScrollViewController.h
// UIViewAndUIScrollView
//
// Created by Kenshin Cui on 14-2-23.
// Copyright (c) 2014年 Kenshin Cui. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface KCScrollViewController : UIViewController

@property (nonatomic,strong) UIScrollView *scrollView;

@property (nonatomic,strong) UIImageView *imageView;

@end

//
// KCScrollViewController.m
// UIViewAndUIScrollView
//
// Created by Kenshin Cui on 14-2-23.
// Copyright (c) 2014年 Kenshin Cui. All rights reserved.
//

#import "KCScrollViewController.h"

//實(shí)現(xiàn)UIScrollView代理
@interface KCScrollViewController ()<UIScrollViewDelegate>

@end

@implementation KCScrollViewController

- (void)viewDidLoad {
 [super viewDidLoad];
 
 //添加scrollView控件
 //注意UIScreen代表當(dāng)前屏幕對(duì)象，其applicationFrame是當(dāng)前屏幕內(nèi)容區(qū)域
 _scrollView =[[UIScrollView alloc]initWithFrame:[UIScreen mainScreen].applicationFrame];
 //_scrollView.backgroundColor=[UIColor redColor];
 _scrollView.contentMode=UIViewContentModeScaleToFill;
 [self.view addSubview:_scrollView];
 
 
 //添加圖片控件
 UIImage *image=[UIImage imageNamed:@"wwdc14-labs-hero-background.jpg"];
 _imageView=[[UIImageView alloc]initWithImage:image];
 [_scrollView addSubview:_imageView];
 
 
 
 //contentSize必須設(shè)置,否則無(wú)法滾動(dòng)，當(dāng)前設(shè)置為圖片大小
 _scrollView.contentSize=_imageView.frame.size;
 
 //實(shí)現(xiàn)縮放：maxinumZoomScale必須大于minimumZoomScale同時(shí)實(shí)現(xiàn)viewForZoomingInScrollView方法
 _scrollView.minimumZoomScale=0.6;
 _scrollView.maximumZoomScale=3.0;
 //設(shè)置代理
 _scrollView.delegate=self;
 

 //邊距，不屬于內(nèi)容部分，內(nèi)容坐標(biāo)（0，0）指的是內(nèi)容的左上角不包括邊界
 //_scrollView.contentInset=UIEdgeInsetsMake(10, 20, 10, 20);
 
 //顯示滾動(dòng)內(nèi)容的指定位置
 //_scrollView.contentOffset=CGPointMake(10, 0);
 
 //隱藏滾動(dòng)條
 _scrollView.showsHorizontalScrollIndicator=NO;
 _scrollView.showsVerticalScrollIndicator=NO;
 
 //禁用彈簧效果
 //_scrollView.bounces=NO;
}

#pragma mark 實(shí)現(xiàn)縮放視圖代理方法，不實(shí)現(xiàn)此方法無(wú)法縮放
-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
 return _imageView;
}
-(void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView{
 NSLog(@"scrollViewWillBeginDecelerating");
}
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
 NSLog(@"scrollViewDidEndDecelerating");
}
-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{
 NSLog(@"scrollViewWillBeginDragging");
}
-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{
 NSLog(@"scrollViewDidEndDragging");
}
-(void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view{
 NSLog(@"scrollViewWillBeginZooming");
}
-(void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale{
 NSLog(@"scrollViewDidEndZooming");
}
//-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
// NSLog(@"scrollViewDidScroll");
//}

#pragma mark 當(dāng)圖片小于屏幕寬高時(shí)縮放后讓圖片顯示到屏幕中間
-(void)scrollViewDidZoom:(UIScrollView *)scrollView{
 CGSize originalSize=_scrollView.bounds.size;
 CGSize contentSize=_scrollView.contentSize;
 CGFloat offsetX=originalSize.width>contentSize.width?(originalSize.width-contentSize.width)/2:0;
 CGFloat offsetY=originalSize.height>contentSize.height?(originalSize.height-contentSize.height)/2:0;

 _imageView.center=CGPointMake(contentSize.width/2+offsetX, contentSize.height/2+offsetY);
}

@end

//
// KCPerson.h
// ARC
//
// Created by Kenshin Cui on 14-2-23.
// Copyright (c) 2014年 Kenshin Cui. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface KCPerson : NSObject

@property (nonatomic,assign) int no;

@end

//
// KCPerson.m
// ARC
//
// Created by Kenshin Cui on 14-2-23.
// Copyright (c) 2014年 Kenshin Cui. All rights reserved.
//

#import "KCPerson.h"

@implementation KCPerson

-(NSString *)description{
 return [NSString stringWithFormat:@"no=%i",_no];
}

@end

//
// main.m
// ARC
//
// Created by Kenshin Cui on 14-2-23.
// Copyright (c) 2014年 Kenshin Cui. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "KCPerson.h"

int main(int argc, const char * argv[]) {
 @autoreleasepool {
 
 //strong
 __strong KCPerson *person1=[[KCPerson alloc]init];
 __strong KCPerson *person2=person1;
 person1.no=1;
 NSLog(@"%@",person2); //結(jié)果：no=1
 person1=nil;
 NSLog(@"%@",person2); //結(jié)果：no=1
 
 
 //weak
 __strong KCPerson *person3=[[KCPerson alloc]init];
 __weak KCPerson *person4=person3;
 person3.no=3;
 NSLog(@"%@",person4); //結(jié)果：no=3
 person3=nil;
 NSLog(@"%@",person4); //結(jié)果：(null)

 }
 return 0;
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
 <key>0.jpg</key>
 <string>iphone 5s</string>
 <key>1.jpg</key>
 <string>iphone 5c</string>
 <key>2.jpg</key>
 <string>ipad min with retain</string>
 <key>3.jpg</key>
 <string>ipad air</string>
 <key>4.jpg</key>
 <string>ipod</string>
 <key>5.jpg</key>
 <string>ipod touch</string>
 <key>6.jpg</key>
 <string>mac book pro</string>
 <key>7.jpg</key>
 <string>mac book air</string>
 <key>8.jpg</key>
 <string>imac</string>
</dict>
</plist>

//
// KCMainViewController.m
// ImageViewer
//
// Created by Kenshin Cui on 14-2-23.
// Copyright (c) 2014年 Kenshin Cui. All rights reserved.
//

#import "KCMainViewController.h"
#define SCREEN_WIDTH 320
#define SCREEN_HEIGHT 568
#define IMAGEVIEW_COUNT 3

@interface KCMainViewController ()<UIScrollViewDelegate>{
 UIScrollView *_scrollView;
 UIImageView *_leftImageView;
 UIImageView *_centerImageView;
 UIImageView *_rightImageView;
 UIPageControl *_pageControl;
 UILabel *_label;
 NSMutableDictionary *_imageData;//圖片數(shù)據(jù)
 int _currentImageIndex;//當(dāng)前圖片索引
 int _imageCount;//圖片總數(shù)
}

@end

@implementation KCMainViewController

- (void)viewDidLoad {
 [super viewDidLoad];
 //加載數(shù)據(jù)
 [self loadImageData];
 //添加滾動(dòng)控件
 [self addScrollView];
 //添加圖片控件
 [self addImageViews];
 //添加分頁(yè)控件
 [self addPageControl];
 //添加圖片信息描述控件
 [self addLabel];
 //加載默認(rèn)圖片
 [self setDefaultImage];
}

#pragma mark 加載圖片數(shù)據(jù)
-(void)loadImageData{
 //讀取程序包路徑中的資源文件
 NSString *path=[[NSBundle mainBundle] pathForResource:@"imageInfo" ofType:@"plist"];
 _imageData=[NSMutableDictionary dictionaryWithContentsOfFile:path];
 _imageCount=(int)_imageData.count;
}

#pragma mark 添加控件
-(void)addScrollView{
 _scrollView=[[UIScrollView alloc]initWithFrame:[UIScreen mainScreen].bounds];
 [self.view addSubview:_scrollView];
 //設(shè)置代理
 _scrollView.delegate=self;
 //設(shè)置contentSize
 _scrollView.contentSize=CGSizeMake(IMAGEVIEW_COUNT*SCREEN_WIDTH, SCREEN_HEIGHT) ;
 //設(shè)置當(dāng)前顯示的位置為中間圖片
 [_scrollView setContentOffset:CGPointMake(SCREEN_WIDTH, 0) animated:NO];
 //設(shè)置分頁(yè)
 _scrollView.pagingEnabled=YES;
 //去掉滾動(dòng)條
 _scrollView.showsHorizontalScrollIndicator=NO;
}

#pragma mark 添加圖片三個(gè)控件
-(void)addImageViews{
 _leftImageView=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT)];
 _leftImageView.contentMode=UIViewContentModeScaleAspectFit;
 [_scrollView addSubview:_leftImageView];
 _centerImageView=[[UIImageView alloc]initWithFrame:CGRectMake(SCREEN_WIDTH, 0, SCREEN_WIDTH, SCREEN_HEIGHT)];
 _centerImageView.contentMode=UIViewContentModeScaleAspectFit;
 [_scrollView addSubview:_centerImageView];
 _rightImageView=[[UIImageView alloc]initWithFrame:CGRectMake(2*SCREEN_WIDTH, 0, SCREEN_WIDTH, SCREEN_HEIGHT)];
 _rightImageView.contentMode=UIViewContentModeScaleAspectFit;
 [_scrollView addSubview:_rightImageView];

}
#pragma mark 設(shè)置默認(rèn)顯示圖片
-(void)setDefaultImage{
 //加載默認(rèn)圖片
 _leftImageView.image=[UIImage imageNamed:[NSString stringWithFormat:@"%i.jpg",_imageCount-1]];
 _centerImageView.image=[UIImage imageNamed:[NSString stringWithFormat:@"%i.jpg",0]];
 _rightImageView.image=[UIImage imageNamed:[NSString stringWithFormat:@"%i.jpg",1]];
 _currentImageIndex=0;
 //設(shè)置當(dāng)前頁(yè)
 _pageControl.currentPage=_currentImageIndex;
 NSString *imageName=[NSString stringWithFormat:@"%i.jpg",_currentImageIndex];
 _label.text=_imageData[imageName];
}

#pragma mark 添加分頁(yè)控件
-(void)addPageControl{
 _pageControl=[[UIPageControl alloc]init];
 //注意此方法可以根據(jù)頁(yè)數(shù)返回UIPageControl合適的大小
 CGSize size= [_pageControl sizeForNumberOfPages:_imageCount];
 _pageControl.bounds=CGRectMake(0, 0, size.width, size.height);
 _pageControl.center=CGPointMake(SCREEN_WIDTH/2, SCREEN_HEIGHT-100);
 //設(shè)置顏色
 _pageControl.pageIndicatorTintColor=[UIColor colorWithRed:193/255.0 green:219/255.0 blue:249/255.0 alpha:1];
 //設(shè)置當(dāng)前頁(yè)顏色
 _pageControl.currentPageIndicatorTintColor=[UIColor colorWithRed:0 green:150/255.0 blue:1 alpha:1];
 //設(shè)置總頁(yè)數(shù)
 _pageControl.numberOfPages=_imageCount;
 
 [self.view addSubview:_pageControl];
}

#pragma mark 添加信息描述控件
-(void)addLabel{
 
 _label=[[UILabel alloc]initWithFrame:CGRectMake(0, 10, SCREEN_WIDTH,30)];
 _label.textAlignment=NSTextAlignmentCenter;
 _label.textColor=[UIColor colorWithRed:0 green:150/255.0 blue:1 alpha:1];

 [self.view addSubview:_label];
}

#pragma mark 滾動(dòng)停止事件
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
 //重新加載圖片
 [self reloadImage];
 //移動(dòng)到中間
 [_scrollView setContentOffset:CGPointMake(SCREEN_WIDTH, 0) animated:NO];
 //設(shè)置分頁(yè)
 _pageControl.currentPage=_currentImageIndex;
 //設(shè)置描述
 NSString *imageName=[NSString stringWithFormat:@"%i.jpg",_currentImageIndex];
 _label.text=_imageData[imageName];
}

#pragma mark 重新加載圖片
-(void)reloadImage{
 int leftImageIndex,rightImageIndex;
 CGPoint offset=[_scrollView contentOffset];
 if (offset.x>SCREEN_WIDTH) { //向右滑動(dòng)
  _currentImageIndex=(_currentImageIndex+1)%_imageCount;
 }else if(offset.x<SCREEN_WIDTH){ //向左滑動(dòng)
  _currentImageIndex=(_currentImageIndex+_imageCount-1)%_imageCount;
 }
 //UIImageView *centerImageView=(UIImageView *)[_scrollView viewWithTag:2];
 _centerImageView.image=[UIImage imageNamed:[NSString stringWithFormat:@"%i.jpg",_currentImageIndex]];
 
 //重新設(shè)置左右圖片
 leftImageIndex=(_currentImageIndex+_imageCount-1)%_imageCount;
 rightImageIndex=(_currentImageIndex+1)%_imageCount;
 _leftImageView.image=[UIImage imageNamed:[NSString stringWithFormat:@"%i.jpg",leftImageIndex]];
 _rightImageView.image=[UIImage imageNamed:[NSString stringWithFormat:@"%i.jpg",rightImageIndex]];
}

@end