iOS:第三方框架MJPhotoBrowser图片浏览器的使用

介绍：MJPhotoBrowser这个第三方库是MJ老师封装的一套用来浏览图片的浏览器，可是是本地图片、网络图片、gif图片等，其也依赖了SDWebImage、SVProgressHUD、YLGIFImage这些三方库，因为高度封装，所以集成起来比较简单，貌似已经停止更新并卸下了。下面看一些几个重要的类：

MJPhotoBrowser框架：http://files.cnblogs.com/files/XYQ-208910/MJPhotoBrowser.zip 

图片模型类MJPhoto

MJPhoto.h

#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#import <QuartzCore/QuartzCore.h>
#import <YLGIFImage/YLImageView.h>
#import <YLGIFImage/YLGIFImage.h>
#import <SDWebImage/UIImageView+WebCache.h>
#import <SVProgressHUD/SVProgressHUD.h>

@interface MJPhoto : NSObject

@property (nonatomic, strong) NSURL *url;     //图片链接
@property (nonatomic, strong) UIImage *image; // 完整的图片

@property (nonatomic, strong) UIImageView *srcImageView; // 来源view
@property (nonatomic, strong, readonly) UIImage *placeholder; //占位图片
@property (nonatomic, strong, readonly) UIImage *capture; //截图

// 是否已经保存到相册
@property (nonatomic, assign) BOOL save; 
@property (nonatomic, assign) int index; // 索引

@end

MJPhoto.m

#import "MJPhoto.h"

@implementation MJPhoto

#pragma mark - 截图
- (UIImage *)capture:(UIView *)view
{
    UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, 0.0);
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return img;
}

- (void)setSrcImageView:(UIImageView *)srcImageView
{
    _srcImageView = srcImageView;
    _placeholder = srcImageView.image;
    if (srcImageView.clipsToBounds) {
        _capture = [self capture:srcImageView];
    }
}

@end

预览器类MJPhotoBrowser

MJPhotoBrowser.h

#import "MJPhoto.h"

@protocol MJPhotoBrowserDelegate;

@interface MJPhotoBrowser : NSObject <UIScrollViewDelegate>
// 所有的图片对象
@property (nonatomic, strong) NSArray *photos;
// 当前展示的图片索引
@property (nonatomic, assign) NSUInteger currentPhotoIndex;
// 保存按钮
@property (nonatomic, assign) NSUInteger showSaveBtn;

// 显示图片
- (void)show;

@end

集成过来使用的方法：

1.本地图片

-(void)addImage:(UIImage *)image
{
    [self.photos addObject:image];
    UIImageView *imageView = [[UIImageView alloc]initWithImage:image];
    imageView.contentMode = UIViewContentModeScaleToFill;
    imageView.userInteractionEnabled = YES;
    [imageView addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(photoTap:)]];
    [self addSubview:imageView];
}

//点击预览图片
- (void)photoTap:(UITapGestureRecognizer *)recognizer
{
    //1.创建图片浏览器
    NSMutableArray *kjphotos = [NSMutableArray array];
    MJPhotoBrowser *brower = [[MJPhotoBrowser alloc] init];
    
    //2.告诉图片浏览器显示所有的图片
    for (int i = 0 ; i < self.photos.count; i++) {
        //传递数据给浏览器
        MJPhoto *photo = [[MJPhoto alloc] init];
        photo.image = self.photos[i];
        photo.srcImageView = self.subviews[i]; //设置来源哪一个UIImageView
        [kjphotos addObject:photo];
    }
    brower.photos = kjphotos;
    
    //3.设置默认显示的图片索引
    brower.currentPhotoIndex = recognizer.view.tag;
    
    //4.显示浏览器
    [brower show];
}

2.网络图片

//监听图片的点击  
- (void)tapPhoto:(UITapGestureRecognizer *)recognizer  
{  
    //1.创建图片浏览器  
    MJPhotoBrowser *brower = [[MJPhotoBrowser alloc] init];  
      
    //2.告诉图片浏览器显示所有的图片  
    NSMutableArray *photos = [NSMutableArray array];  
    for (int i = 0 ; i < self.photos.count; i++) {  
        Photo *pic = self.photos[i];  
        //传递数据给浏览器  
        MJPhoto *photo = [[MJPhoto alloc] init];  
        photo.url = [NSURL URLWithString:pic.bmiddle_pic];  
        photo.srcImageView = self.subviews[i]; //设置来源哪一个UIImageView  
        [photos addObject:photo];  
    }  
    brower.photos = photos;  
      
    //3.设置默认显示的图片索引  
    brower.currentPhotoIndex = recognizer.view.tag;  
      
    //4.显示浏览器  
    [brower show];  
}