图片放大预览（支持多张，支持双击放大）

使用方法　

JZAlbumViewController *album = [[JZAlbumViewController alloc] init];

album.imgArr = self.imgsArray;//可以是图片的url字符串数组，亦可以是UIImage

album.currentIndex = tap.view.tag-100; //下标

[self presentViewController:album animated:YES completion:nil];

源码（或者去文件中下载）

//
//  JZAlbumViewController.h
//  aoyouHH
//  功能描述：用于显示并浏览图片，添加了加载进度条功能
//  Created by jinzelu on 15/4/27.
//  Copyright (c) 2015年 jinzelu. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface JZAlbumViewController : UIViewController

/**
 *  接收图片数组，数组类型可以是url数组，image数组
 */
@property(nonatomic, strong) NSMutableArray *imgArr;
/**
 *  显示scrollView
 */
@property(nonatomic, strong) UIScrollView *scrollView;
/**
 *  显示下标
 */
@property(nonatomic, strong) UILabel *sliderLabel;
/**
 *  接收当前图片的序号,默认的是0
 */
@property(nonatomic, assign) NSInteger currentIndex;

@end

//
//  JZAlbumViewController.m
//  aoyouHH
//
//  Created by jinzelu on 15/4/27.
//  Copyright (c) 2015年 jinzelu. All rights reserved.
//

#import "JZAlbumViewController.h"
#import "UIImageView+WebCache.h"
#import "PhotoView.h"

#define screen_width [UIScreen mainScreen].bounds.size.width
#define screen_height [UIScreen mainScreen].bounds.size.height

@interface JZAlbumViewController ()<UIScrollViewDelegate,PhotoViewDelegate>
{
    CGFloat lastScale;
    NSMutableArray *_subViewList;
}

@end

@implementation JZAlbumViewController

-(id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        //
        _subViewList = [[NSMutableArray alloc] init];
    }
    return self;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    lastScale = 1.0;
    self.view.backgroundColor = [UIColor blackColor];

//    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(OnTapView)];
//    [self.view addGestureRecognizer:tap];

    [self initScrollView];
    [self addLabels];
    [self setPicCurrentIndex:self.currentIndex];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(void)initScrollView{
//    [[SDImageCache sharedImageCache] cleanDisk];
//    [[SDImageCache sharedImageCache] clearMemory];

    self.scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, screen_width, screen_height)];
    self.scrollView.pagingEnabled = YES;
    self.scrollView.userInteractionEnabled = YES;
    self.scrollView.showsHorizontalScrollIndicator = NO;

    self.scrollView.contentSize = CGSizeMake(self.imgArr.count*screen_width, screen_height);
    self.scrollView.delegate = self;
    self.scrollView.contentOffset = CGPointMake(0, 0);
    //设置放大缩小的最大，最小倍数
//    self.scrollView.minimumZoomScale = 1;
//    self.scrollView.maximumZoomScale = 2;
    [self.view addSubview:self.scrollView];

    for (int i = 0; i < self.imgArr.count; i++) {
        [_subViewList addObject:[NSNull class]];
    }

}

-(void)addLabels{
    self.sliderLabel = [[UILabel alloc] initWithFrame:CGRectMake(40, screen_height-64-49, 60, 30)];
    self.sliderLabel.backgroundColor = [UIColor clearColor];
    self.sliderLabel.textColor = [UIColor whiteColor];
    self.sliderLabel.text = [NSString stringWithFormat:@"%ld/%lu",self.currentIndex+1,(unsigned long)self.imgArr.count];
    [self.view addSubview:self.sliderLabel];
}

-(void)setPicCurrentIndex:(NSInteger)currentIndex{
    _currentIndex = currentIndex;
    self.scrollView.contentOffset = CGPointMake(screen_width*currentIndex, 0);
    [self loadPhote:_currentIndex];
    [self loadPhote:_currentIndex+1];
    [self loadPhote:_currentIndex-1];
}

-(void)loadPhote:(NSInteger)index{
    if (index<0 || index >=self.imgArr.count) {
        return;
    }

    id currentPhotoView = [_subViewList objectAtIndex:index];
    if (![currentPhotoView isKindOfClass:[PhotoView class]]) {
        //url数组
        CGRect frame = CGRectMake(index*_scrollView.frame.size.width, 0, self.view.frame.size.width, self.view.frame.size.height);
        PhotoView *photoV = [[PhotoView alloc] initWithFrame:frame withPhotoUrl:[self.imgArr objectAtIndex:index]];
        photoV.delegate = self;
        [self.scrollView insertSubview:photoV atIndex:0];
        [_subViewList replaceObjectAtIndex:index withObject:photoV];
    }else{
        PhotoView *photoV = (PhotoView *)currentPhotoView;
    }

}

#pragma mark - PhotoViewDelegate
-(void)TapHiddenPhotoView{
    [self dismissViewControllerAnimated:YES completion:nil];
}

-(void)OnTapView{
    [self dismissViewControllerAnimated:YES completion:nil];
}
//手势
-(void)pinGes:(UIPinchGestureRecognizer *)sender{
    if ([sender state] == UIGestureRecognizerStateBegan) {
        lastScale = 1.0;
    }
    CGFloat scale = 1.0 - (lastScale -[sender scale]);
    lastScale = [sender scale];
    self.scrollView.contentSize = CGSizeMake(self.imgArr.count*screen_width, screen_height*lastScale);
    NSLog(@"scale:%f   lastScale:%f",scale,lastScale);
    CATransform3D newTransform = CATransform3DScale(sender.view.layer.transform, scale, scale, 1);

    sender.view.layer.transform = newTransform;
    if ([sender state] == UIGestureRecognizerStateEnded) {
        //
    }
}

#pragma mark - UIScrollViewDelegate
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
    NSLog(@"scrollViewDidEndDecelerating");
    int i = scrollView.contentOffset.x/screen_width+1;
    [self loadPhote:i-1];
    self.sliderLabel.text = [NSString stringWithFormat:@"%d/%lu",i,(unsigned long)self.imgArr.count];
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end

//
//  PhotoView.h
//  aoyouHH
//
//  Created by jinzelu on 15/4/30.
//  Copyright (c) 2015年 jinzelu. All rights reserved.
//

#import <UIKit/UIKit.h>
//1.
@protocol PhotoViewDelegate <NSObject>

//点击图片时，隐藏图片浏览器
-(void)TapHiddenPhotoView;

@end

@interface PhotoView : UIView
/**
 *  添加的图片
 */
@property(nonatomic, strong) UIImageView *imageView;
//2.
/**
 *  代理
 */
@property(nonatomic, assign) id<PhotoViewDelegate> delegate;

-(id)initWithFrame:(CGRect)frame withPhotoUrl:(NSString *)photoUrl;

-(id)initWithFrame:(CGRect)frame withPhotoImage:(UIImage *)image;

@end

//
//  PhotoView.m
//  aoyouHH
//
//  Created by jinzelu on 15/4/30.
//  Copyright (c) 2015年 jinzelu. All rights reserved.
//

#import "PhotoView.h"
#import "UIImageView+WebCache.h"
#import "SVProgressHUD.h"

@interface PhotoView ()<UIScrollViewDelegate>
{
    UIScrollView *_scrollView;
}

@end

@implementation PhotoView

-(id)initWithFrame:(CGRect)frame withPhotoUrl:(NSString *)photoUrl{
    self = [super initWithFrame:frame];
    if (self) {
        //添加scrollView
        _scrollView = [[UIScrollView alloc] initWithFrame:self.bounds];
        _scrollView.delegate = self;
        _scrollView.minimumZoomScale = 1;
        _scrollView.maximumZoomScale = 3;

        _scrollView.showsHorizontalScrollIndicator = NO;
        _scrollView.showsVerticalScrollIndicator = NO;
        [self addSubview:_scrollView];
        //添加图片
        self.imageView = [[UIImageView alloc] initWithFrame:self.bounds];
        self.imageView.contentMode = UIViewContentModeScaleAspectFit;

        SDWebImageManager *manager = [SDWebImageManager sharedManager];
        BOOL isCached = [manager cachedImageExistsForURL:[NSURL URLWithString:photoUrl]];
        if (!isCached) {//没有缓存
//            hud = [MBProgressHUD showHUDAddedTo:self animated:YES];
//            hud.mode = MBProgressHUDModeDeterminate;
            [SVProgressHUD showProgress:0];
        }
        [self.imageView sd_setImageWithURL:[NSURL URLWithString:photoUrl] placeholderImage:[UIImage imageNamed:@"loading"] options:0 progress:^(NSInteger receivedSize, NSInteger expectedSize){
            [SVProgressHUD showProgress:((float)receivedSize)/expectedSize];
        } completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL){
            NSLog(@"图片加载完成");
            if (!isCached) {
                [SVProgressHUD dismiss];
            }
        }];

        [self.imageView setUserInteractionEnabled:YES];
        [_scrollView addSubview:self.imageView];

        //添加手势
        UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
        UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTap:)];
        UITapGestureRecognizer *twoFingerTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTwoFingerTap:)];

        singleTap.numberOfTapsRequired = 1;
        singleTap.numberOfTouchesRequired = 1;
        doubleTap.numberOfTapsRequired = 2;//需要点两下
        twoFingerTap.numberOfTouchesRequired = 2;//需要两个手指touch

        [self.imageView addGestureRecognizer:singleTap];
        [self.imageView addGestureRecognizer:doubleTap];
        [self.imageView addGestureRecognizer:twoFingerTap];
        [singleTap requireGestureRecognizerToFail:doubleTap];//如果双击了，则不响应单击事件

        [_scrollView setZoomScale:1];
    }
    return self;
}

-(id)initWithFrame:(CGRect)frame withPhotoImage:(UIImage *)image{
    self = [super initWithFrame:frame];
    if (self) {
        //添加scrollView
        _scrollView = [[UIScrollView alloc] initWithFrame:self.bounds];
        _scrollView.delegate = self;
        _scrollView.minimumZoomScale = 1;
        _scrollView.maximumZoomScale = 3;

        _scrollView.showsHorizontalScrollIndicator = NO;
        _scrollView.showsVerticalScrollIndicator = NO;
        [self addSubview:_scrollView];
        //添加图片
        self.imageView = [[UIImageView alloc] initWithFrame:self.bounds];
        self.imageView.contentMode = UIViewContentModeScaleAspectFit;
        [self.imageView setImage:image];

        [self.imageView setUserInteractionEnabled:YES];
        [_scrollView addSubview:self.imageView];

        //添加手势
        UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
        UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTap:)];
        UITapGestureRecognizer *twoFingerTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTwoFingerTap:)];

        singleTap.numberOfTapsRequired = 1;
        singleTap.numberOfTouchesRequired = 1;
        doubleTap.numberOfTapsRequired = 2;//需要点两下
        twoFingerTap.numberOfTouchesRequired = 2;//需要两个手指touch

        [self.imageView addGestureRecognizer:singleTap];
        [self.imageView addGestureRecognizer:doubleTap];
        [self.imageView addGestureRecognizer:twoFingerTap];
        [singleTap requireGestureRecognizerToFail:doubleTap];//如果双击了，则不响应单击事件

        [_scrollView setZoomScale:1];
    }
    return self;
}

#pragma mark - UIScrollViewDelegate
//scroll view处理缩放和平移手势，必须需要实现委托下面两个方法,另外 maximumZoomScale和minimumZoomScale两个属性要不一样
//1.返回要缩放的图片
-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
    return self.imageView;
}
//2.重新确定缩放完后的缩放倍数
-(void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale{
    [scrollView setZoomScale:scale+0.01 animated:NO];
    [scrollView setZoomScale:scale animated:NO];
}

#pragma mark - 图片的点击，touch事件
-(void)handleSingleTap:(UITapGestureRecognizer *)gestureRecognizer{
    NSLog(@"单击");
    if (gestureRecognizer.numberOfTapsRequired == 1) {
        [self.delegate TapHiddenPhotoView];
    }
}

-(void)handleDoubleTap:(UITapGestureRecognizer *)gestureRecognizer{
    NSLog(@"双击");
    if (gestureRecognizer.numberOfTapsRequired == 2) {
        if(_scrollView.zoomScale == 1){
            float newScale = [_scrollView zoomScale] *2;
            CGRect zoomRect = [self zoomRectForScale:newScale withCenter:[gestureRecognizer locationInView:gestureRecognizer.view]];
            [_scrollView zoomToRect:zoomRect animated:YES];
        }else{
            float newScale = [_scrollView zoomScale]/2;
            CGRect zoomRect = [self zoomRectForScale:newScale withCenter:[gestureRecognizer locationInView:gestureRecognizer.view]];
            [_scrollView zoomToRect:zoomRect animated:YES];
        }
    }
}

-(void)handleTwoFingerTap:(UITapGestureRecognizer *)gestureRecongnizer{
    NSLog(@"2手指操作");
    float newScale = [_scrollView zoomScale]/2;
    CGRect zoomRect = [self zoomRectForScale:newScale withCenter:[gestureRecongnizer locationInView:gestureRecongnizer.view]];
    [_scrollView zoomToRect:zoomRect animated:YES];
}

#pragma mark - 缩放大小获取方法
-(CGRect)zoomRectForScale:(CGFloat)scale withCenter:(CGPoint)center{
    CGRect zoomRect;
    //大小
    zoomRect.size.height = [_scrollView frame].size.height/scale;
    zoomRect.size.width = [_scrollView frame].size.width/scale;
    //原点
    zoomRect.origin.x = center.x - zoomRect.size.width/2;
    zoomRect.origin.y = center.y - zoomRect.size.height/2;
    return zoomRect;
}

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
}
*/

@end
时间： 2024-11-05 18:32:10

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