工具类：自写一个简单的图片浏览器（LCGPicBrowser）

#import <UIKit/UIKit.h>@interface LCGPicBrowser : UIView@property (nonatomic,strong) UIScrollView *scrollView;@property (nonatomic,strong) UILabel *countLB;@property (nonatomic,strong) NSMutableArray *images;@property (nonatomic,strong) UITapGestureRecognizer *currentTap;@property (nonatomic, copy) void (^smallerBlock)(UITapGestureRecognizer *tap);@property (nonatomic, copy) void (^saveBlock)(UILongPressGestureRecognizer *tap);/** *  快速创建图片浏览器 * *  @param rect                   图片浏览器的大小 *  @param images                 图片数组 *  @param currentTap             当前手势（用于取出当前点击的图片） *  @param smallerBlock           点击缩小 *  @param saveBlock              长按保存 * *  @return 图片浏览器 */+ (instancetype)createTheLCGPicBrowser:(CGRect)rect images:(NSMutableArray *)images currentTap:(UITapGestureRecognizer *)currentTap smaller:(void(^)(UITapGestureRecognizer *tap))smallerBlock save:(void(^)(UILongPressGestureRecognizer *tap))saveBlock;@end

#import "LCGPicBrowser.h"@interface LCGPicBrowser ()<UIScrollViewDelegate>@end@implementation LCGPicBrowser- (instancetype)initWithFrame:(CGRect)frame {    if (self = [super initWithFrame:frame]) {        [self setPicBrowser];    }    return self;}//快速创建方法+ (instancetype)createTheLCGPicBrowser:(CGRect)rect images:(NSMutableArray *)images currentTap:(UITapGestureRecognizer *)currentTap smaller:(void(^)(UITapGestureRecognizer *tap))smallerBlock save:(void(^)(UILongPressGestureRecognizer *tap))saveBlock {    LCGPicBrowser *picBrowser = [[LCGPicBrowser alloc]initWithFrame:rect];    picBrowser.backgroundColor = [UIColor clearColor];    picBrowser.images = images;    picBrowser.currentTap = currentTap;    picBrowser.smallerBlock = smallerBlock;    picBrowser.saveBlock = saveBlock;    CGFloat totalWidth = 0;    //往 scrollView 添加图片 or scrollView（长图）    for (int i = 0; i < picBrowser.images.count; i++) {        //计算总宽度        totalWidth = totalWidth + S_W;        //创建imageview        UIImageView *sourceImg = (UIImageView *)picBrowser.images[i];        float proportion = sourceImg.image.size.width / sourceImg.image.size.height;        UIImageView *imageView = [[UIImageView alloc]initWithImage:sourceImg.image];        imageView.backgroundColor = [UIColor whiteColor];        //设置 frame        if ((S_H - S_W / proportion) * 0.5 >= 0) {            imageView.frame = CGRectMake(S_W * i, (S_H - S_W / proportion) * 0.5, S_W, S_W / proportion);        }else {            imageView.frame = CGRectMake(S_W * i, 0, S_W, S_W / proportion);        }        //判断需不需要加 scrollView        if (imageView.height > S_H) {            //是长图则需要再加一个 scrollView            UIScrollView *subScrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(S_W * i, 0, S_W, S_H)];            subScrollView.contentSize = CGSizeMake(S_W, imageView.height);            imageView.x = 0;            imageView.y = 0;            [subScrollView addSubview:imageView];            [picBrowser.scrollView addSubview: subScrollView];        }else {            //不是长图则直接添加到父 scrollView 上            [picBrowser.scrollView addSubview:imageView];        }    }    //设置 contensize    picBrowser.scrollView.contentSize = CGSizeMake(totalWidth, 0);    //移动到当前图片    [picBrowser.scrollView setContentOffset:CGPointMake(S_W * currentTap.view.tag, 0) animated:NO];    //设置页数    picBrowser.countLB = [[UILabel alloc]initWithFrame:CGRectMake(picBrowser.centerX - 30, 30, 60, 35)];    picBrowser.countLB.text = [NSString stringWithFormat:@"%ld/%ld",currentTap.view.tag + 1,picBrowser.images.count];    picBrowser.countLB.textAlignment = NSTextAlignmentCenter;    picBrowser.countLB.textColor = [UIColor whiteColor];    picBrowser.countLB.font = [UIFont systemFontOfSize:20.0f];    [picBrowser addSubview:picBrowser.countLB];    return picBrowser;}- (void)setPicBrowser {    //创建 scrollView    self.scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, self.width, self.height)];    self.scrollView.backgroundColor = [UIColor blackColor];    self.scrollView.alpha = 0;    self.scrollView.delegate = self;    self.scrollView.tag = 1000;    self.scrollView.showsHorizontalScrollIndicator = NO;    //分页    self.scrollView.pagingEnabled = YES;    //点击退出的手势    UITapGestureRecognizer *tap1 = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(smallerBroswer:)];    [self.scrollView addGestureRecognizer:tap1];    //长按保存手势    UILongPressGestureRecognizer *longPressGest = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPressView:)];    longPressGest.minimumPressDuration = 0.5;    longPressGest.allowableMovement = 30;    [self.scrollView addGestureRecognizer:longPressGest];    [self addSubview:self.scrollView];    //渐变出场动画    [UIView animateWithDuration:0.2 animations:^{        self.scrollView.alpha = 1;    }];}//长按图片会调用此方法- (void)longPressView:(UILongPressGestureRecognizer *)longPressGest {    if (self.saveBlock) {        self.saveBlock(longPressGest);    }}//点击缩成小图- (void)smallerBroswer:(UITapGestureRecognizer *)tap {    if (self.smallerBlock) {        self.smallerBlock(tap);    }}#pragma mark - UIScrollViewDelegate- (void)scrollViewDidScroll:(UIScrollView *)scrollView {    if (scrollView.tag == 1000) {        self.countLB.text = [NSString stringWithFormat:@"%.f/%ld",scrollView.contentOffset.x / S_W + 1,self.images.count];    }}@end

/****************具体使用*************/

//屏幕宽高#define S_W [UIScreen mainScreen].bounds.size.width#define S_H [UIScreen mainScreen].bounds.size.height//头部声明@property (nonatomic,strong) NSMutableArray *images;//储存要浏览的imageview 的数组@property (nonatomic,strong) LCGPicBrowser *picBroswer;

#pragma mark - 点击图片放大//点击显示大图- (void)clickToBiggerImage:(UITapGestureRecognizer *)tap{    [self.images removeAllObjects];    DetailCommunityCell *cell = (DetailCommunityCell *)tap.view.superview.superview.superview.superview;    NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];    LCGAllArticleModel *tempModel = self.allArticleArr[indexPath.row];    NSMutableArray *picURLArr = (NSMutableArray *)[NSMutableArray arrayWithArray:[tempModel.pics componentsSeparatedByString:@";"]];    CGFloat totalWidth = 0;    for (int i = 0; i < picURLArr.count; i++) {        NSString *temp = picURLArr[i];        if (![temp isEqualToString:@""] && ![temp isEqualToString:@"null"] && ![temp isKindOfClass:[NSNull class]])  {            UIImageView *imageView = [[UIImageView alloc]init];            [imageView sd_setImageWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://%@:%@%@", IP, port, picURLArr[i]]] placeholderImage:[UIImage imageNamed:@"jiazaishibai"]];            [self.images addObject:imageView];            totalWidth = totalWidth + S_W;        }    }    __weak typeof(self) weakSelf = self;    self.picBroswer = [LCGPicBrowser createTheLCGPicBrowser:CGRectMake(0, 0, S_W, S_H) images:self.images currentTap:tap smaller:^(UITapGestureRecognizer *tap) {        [UIView animateWithDuration:0.2 animations:^{            self.picBroswer.alpha = 0;            self.picBroswer.countLB.alpha = 0;        }completion:^(BOOL finished) {            [self.picBroswer removeFromSuperview];            [self.picBroswer removeFromSuperview];        }];    } save:^(UILongPressGestureRecognizer *tap) {        [weakSelf longPressView:tap];    }];    [self.view addSubview:self.picBroswer];}//长按图片会调用此方法- (void)longPressView:(UILongPressGestureRecognizer *)longPressGest {    UIAlertController *alertVC = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];    //取消    UIAlertAction *cancelAct = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];    //保存图片    UIAlertAction *saveAct = [UIAlertAction actionWithTitle:@"保存图片" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {        //拿到图片        UIScrollView *scrollView = (UIScrollView *)longPressGest.view;        float num = scrollView.contentOffset.x / S_W;        UIImageView *imageView = (UIImageView *)self.images[[[NSString stringWithFormat:@"%.f",num]integerValue]];        //保存图片        UIImageWriteToSavedPhotosAlbum(imageView.image, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);    }];    //显示弹框    [alertVC addAction:saveAct];    [alertVC addAction:cancelAct];    [self.navigationController presentViewController:alertVC animated:YES completion:nil];}//保存图片回调方法- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo {    if (error) {        [self showTheTipsHUDWithString:@"保存失败"];    } else {        [self showTheTipsHUDWithString:@"保存成功"];    }}