iOS源码之OC相册，可以循环查看图片

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#import "ViewController.h" #import "YZUIScrollView.h" #define kuan ([UIScreen mainScreen].bounds.size.width+20) #define gao [UIScreen mainScreen].bounds.size.height @interface ViewController ()<UIScrollViewDelegate> @property (weak, nonatomic) IBOutlet UIScrollView *huaBu; @property(nonatomic,strong)NSArray *images; @property(nonatomic)NSInteger currentIndex; @end   @implementation ViewController //懒加载,调用get方法时对属性进行初始化 -(NSArray *)images {     if(_images==nil)     {         NSMutableArray *imagearray=[NSMutableArray array];         for (int i=1; i<7; i++) {             NSString *imageName=[NSString stringWithFormat:@"new_feature_%d",i];             UIImage *image=[UIImage imageNamed:imageName];             [imagearray addObject:image];         }         _images=imagearray;     }     return _images; } - (void)viewDidLoad {     [super viewDidLoad];     //设置UIScrollView的contentSize     _huaBu.contentSize=CGSizeMake(kuan*3, gao);     //设置分页     _huaBu.pagingEnabled=YES;     //隐藏水平滚动栏和垂直滚动栏     _huaBu.showsHorizontalScrollIndicator=NO;     _huaBu.showsVerticalScrollIndicator=NO;     //设置背景颜色,突出不同的图片     _huaBu.backgroundColor=[UIColor blackColor];     //设置代理要遵守协议<UIScrollViewDelegate>     _huaBu.delegate=self;     //调用方法添加子视图     [self tianJiaZiShiTu];     //调用方法添加图片     [self tianJiaTuPian]; } //添加子视图的方法 -(void)tianJiaZiShiTu {     //相册的话，是一个大的UIScrollView中放了很多的小UIScrollView，但是为了节省内存空间，所以只是添加了三个UIScrollView（图片不停的变换位置）     for (int i=0; i<3; i++) {         //创建YZUIScrollView         YZUIScrollView * yzuisv=[[YZUIScrollView alloc] initWithFrame:CGRectMake(kuan*i, 0, kuan-20, gao)];         //添加YZUIScrollView         [_huaBu addSubview:yzuisv];         //设置tag值，便于区分         yzuisv.tag=1000+i;     } } //添加方法的图片 -(void)tianJiaTuPian {     YZUIScrollView *leftSC=(YZUIScrollView *)[_huaBu viewWithTag:1000];     YZUIScrollView *middleSC=(YZUIScrollView *)[_huaBu viewWithTag:1001];     YZUIScrollView *rightSC=(YZUIScrollView *)[_huaBu viewWithTag:1002];     leftSC.image=self.images[[self indexFofEnable:_currentIndex-1]];     middleSC.image=self.images[[self indexFofEnable:_currentIndex]];     rightSC.image=self.images[[self indexFofEnable:_currentIndex+1]];     //设置偏移量，这步很重要     _huaBu.contentOffset=CGPointMake(kuan, 0); } //确保索引可用 -(NSInteger)indexFofEnable:(NSInteger)index {     if(index<0)     {         return self.images.count-1;     }     else if (index>self.images.count-1)     {         return 0;     }     else         return index; } //滚动结束后，把所有的缩放视图比例还原为1.0 -(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {     for (id obj in _huaBu.subviews) {         if([obj isKindOfClass:[UIScrollView class]])         {             UIScrollView *scaleSC=(UIScrollView *)obj;             scaleSC.zoomScale=1.0;         }     }     //判断左右滑动     //偏移量的x为0，就是说明向右滑动了，就是看的之前左边的那张图片     if(scrollView.contentOffset.x==0)     {         //对应的图像应该是变成左边的图像         _currentIndex--;     }     //偏移量的x为两个屏幕的宽，就是说明向左滑动了，就是看的之前右边的那张图片     else if(scrollView.contentOffset.x== kuan*2)     {         //对应的图像应该是变成右边的图像         _currentIndex++;     }     _currentIndex=[self indexFofEnable:_currentIndex];     [self tianJiaTuPian]; } - (void)didReceiveMemoryWarning {     [super didReceiveMemoryWarning];     // Dispose of any resources that can be recreated. }   @end

　　第二个类

 

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#import "YZUIScrollView.h"     @interface YZUIScrollView ()<UIScrollViewDelegate>@property(nonatomic,strong)UIImage *image;//内容视图的图片@property(nonatomic,strong)UIImageView *imageview; @end   @implementation YZUIScrollView   -(instancetype)initWithFrame:(CGRect)frame {     if(self =[super initWithFrame:frame])     {         //添加内容视图         UIImageView *imageview1=[[UIImageView alloc] initWithFrame:self.bounds];         [self addSubview:imageview1];         _imageview=imageview1;         //设置最大最小倍数和代理         self.minimumZoomScale=0.5;         self.maximumZoomScale=1.5;         self.delegate=self;         //双击事件         UITapGestureRecognizer *tap=[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(shuangJi:)];         tap.numberOfTapsRequired=2;         [self addGestureRecognizer:tap];     }     return self; } -(void)shuangJi:(UITapGestureRecognizer *)tap {     //当缩放比例不为1.0，还原缩放比例     if (self.zoomScale !=1.0) {         [self setZoomScale:1.0 animated:YES];         return ;     }     CGPoint location =[tap locationInView:self];     CGRect rect =CGRectMake(location.x-100, location.y-100,200,200);     [self zoomToRect:rect animated:YES]; } //重写setImg方法 -(void)setImage:(UIImage *)image {     //set本身的方法要完成的事必须完成     _image=image;     //设置内容视图的图片     _imageview.image=image; } //UIScrollViewDelegate代理方法 -(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {     return _imageview; } @end