多的话不说，直接上代码：

遵守MWPhotoBrowserDelegate协议，

NSMutableArray *_tempImgArr;//存储图片的数据源

UIImage *_saveImg; //将要保存的图片

//点击图片 放大-(void)imgClick:(NSInteger)index{    //创建MWPhotoBrowser ，要使用initWithDelegate方法，要遵循MWPhotoBrowserDelegate协议    MWPhotoBrowser *browser = [[MWPhotoBrowser alloc]initWithDelegate:self];    //设置当前要显示的图片    [browser setCurrentPhotoIndex:index];    //显示导航条（根据自己需求）    self.navigationController.navigationBar.hidden = NO;    browser.navigationController.navigationBar.hidden = NO;    //push到MWPhotoBrowser    [self.navigationController pushViewController:browser animated:YES];}//图片的个数- (NSUInteger)numberOfPhotosInPhotoBrowser:(MWPhotoBrowser *)photoBrowser{        return _tempImgArr.count;}//通过下标获取图片- (id 
    
     )photoBrowser:(MWPhotoBrowser *)photoBrowser photoAtIndex:(NSUInteger)index{        //创建图片模型      MWPhoto *ph = [MWPhoto photoWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@",_tempImgArr[index][@"original"]]]];//图片添加长按手势    UILongPressGestureRecognizer *lpGes = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPressAction:)];    [photoBrowser.view addGestureRecognizer:lpGes];        return ph;    }//获取当前点击的图片-(void)photoBrowser:(MWPhotoBrowser *)photoBrowser didDisplayPhotoAtIndex:(NSUInteger)index{  _saveImg = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@",_tempImgArr[index][@"original"]]]]];}//长按手势-(void)longPressAction:(UILongPressGestureRecognizer *)ges{    //    MWPhotoBrowser *photoBrowser = (MWPhotoBrowser*)[Utils getSuperControllerWith:ges.view];    //只在begin执行一次    if (ges.state == UIGestureRecognizerStateBegan) {        NSLog(@"long pressTap state :begin");        UIAlertController *alertC = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];        UIAlertAction *action1 = [UIAlertAction actionWithTitle:@"保存图片到手机" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {              UIImageWriteToSavedPhotosAlbum(_saveImg, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);        }];        UIAlertAction *action2 = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];        [alertC addAction:action1];        [alertC addAction:action2];        [self.navigationController presentViewController:alertC animated:YES completion:nil];    }    }// 保存图片后到相册后，回调的相关方法，查看是否保存成功- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo {    AppDelegate *app = (AppDelegate*)[[UIApplication sharedApplication] delegate];    MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:app.window animated:YES];    //显示文字    hud.mode = MBProgressHUDModeText;    if (error == nil){        hud.labelText = @"已保存到手机相册！";            } else {        hud.labelText = @"保存失败！";    }    // 隐藏时候从父控件中移除    hud.removeFromSuperViewOnHide = YES;    [hud hide:YES afterDelay:1.5];}
    

如图：