iOS，Objective-C，相册功能的实现。

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#import "ViewController.h"   #define kuan [UIScreen mainScreen].bounds.size.width #define gao [UIScreen mainScreen].bounds.size.height @interface ViewController ()<UIScrollViewDelegate> @property (weak, nonatomic) IBOutlet UIScrollView *huaKuang;   @end   @implementation ViewController   - (void)viewDidLoad {     [super viewDidLoad];     //设置contentSize     _huaKuang.contentSize=CGSizeMake((kuan)*4, gao);     _huaKuang.backgroundColor=[UIColor blackColor];     //设置分页     _huaKuang.pagingEnabled=YES;     //隐藏滚动条     //滚动时是否显示水平滚动条     _huaKuang.showsHorizontalScrollIndicator=NO;     //滚动时是否显示垂直滚动条     _huaKuang.showsVerticalScrollIndicator=NO;     //设置代理,需要遵循代理协议<UIScrollViewDelegate>，写在@interface ViewController ()的后面     _huaKuang.delegate=self;     //添加子视图，因为是多个所以写了一个方法来实现添加     [self tianJianZiShiTu]; } -(void)tianJianZiShiTu {     //假如有六个图片，就要创建六个UIScrollView和六个UIImageView,并且找到六个图片     for(int i=0;i<3;i++)     {         //创建UIScrollView         //为了区分开不同的照片加一个20黑边，需要设置ScrollViewscroll View中的Left和View中的Width         UIScrollView *uisv=[[UIScrollView alloc] initWithFrame:CGRectMake((kuan+20)*i, 0, kuan, gao)];         //把创建完成的添加到总的那个UIScrollView上         [_huaKuang addSubview:uisv];         //创建UIImageView         UIImageView *uiiv=[[UIImageView alloc] initWithFrame:CGRectMake(0, 0, kuan, gao)];         //把创建的UIImageView添加到UIScrollView中         [uisv addSubview:uiiv];         //设置UIImageView的图片          NSString *imageName = [NSString stringWithFormat:@"new_feature_%d",i + 1];         uiiv.image=[UIImage imageNamed:imageName];         //设置tag值         uiiv.tag=1000;         //设置UIScrollView的代理         uisv.delegate=self;         //设置缩放范围         uisv.minimumZoomScale=0.5;         uisv.maximumZoomScale=1.5;         //定义点击事件         UITapGestureRecognizer *tap=[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(dianJiShiJian:)];         //设置有效点击数(就是双击)         tap.numberOfTapsRequired=2;         //添加到UIScrollView中         [uisv addGestureRecognizer:tap];     } } -(void)dianJiShiJian:(UITapGestureRecognizer *)tap {     //获取点击事件的view     UIScrollView *uisv1=(UIScrollView *)tap.view;     if(uisv1.zoomScale!=1.0)    {        [uisv1 setZoomScale:1.0 animated:YES];        return ;    }     CGPoint location=[tap locationInView:tap.view];     CGRect rect=CGRectMake(location.x-100, location.y-100, 200, 200);     [uisv1 zoomToRect:rect animated:YES]; } //指定缩放的视图 -(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{     if (scrollView == _huaKuang) {         return nil;     }     UIImageView *imageView = (UIImageView *)[scrollView viewWithTag:1000];     return imageView; }   //滚动结束，把所有的缩放视图的缩放比例置为1.0 -(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{     if (scrollView == _huaKuang) {         for (id obj in _huaKuang.subviews) {             if ([obj isKindOfClass:[UIScrollView class]]) {                 UIScrollView *scaleSC = (UIScrollView *)obj;                 scaleSC.zoomScale = 1.0;             }         }     } } - (void)didReceiveMemoryWarning {     [super didReceiveMemoryWarning]; }   @end