点击图片视图缩放以及保存本地

#import <UIKit/UIKit.h>

@class DDProgressView;

@interface ZoomImageView : UIImageView<NSURLConnectionDataDelegate>

{

@private

    UIScrollView *_scrollView;

    UIButton *_saveButton;

    UIImageView *_fullImageView;

    DDProgressView *_prpgressView;

    double _length;//请求图片的长度

    NSMutableData *_data;//当前图片请求下来的数据

}

@property(nonatomic,copy)NSString *urlString;//大图片的地址

//添加方法手势（需要给大图片的网址）

- (void)addZoom:(NSString *)urlString;

@end

#import "ZoomImageView.h"

#import "DDProgressView.h"

#import "MBProgressHUD.h"

@implementation ZoomImageView

- (id)initWithFrame:(CGRect)frame

{

    self = [super initWithFrame:frame];

    if (self) {

        // Initialization code

    }

    return self;

}

- (void)_initViews

{

    //滑动视图

    if (_scrollView == nil) {

        _scrollView = [[UIScrollView alloc]initWithFrame:[UIScreen mainScreen].bounds];

        _scrollView.backgroundColor = [UIColor blackColor];

        [self.window addSubview:_scrollView];

        

        //添加缩小手势

        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(zoomOutAction)];

        [_scrollView addGestureRecognizer:tap];

        [tap release];

    }

    //大图片视图

    if (_fullImageView == nil) {

        _fullImageView = [[UIImageView alloc]initWithImage:self.image];

        _fullImageView.contentMode = UIViewContentModeScaleAspectFit;

        _fullImageView.userInteractionEnabled = YES;

        [_scrollView addSubview:_fullImageView];

    }

    //进度条

    if (_prpgressView == nil) {

        _prpgressView = [[DDProgressView alloc]initWithFrame:CGRectMake(10, kScreenHeight / 2, kScreenWidth - 20, 50)];

        [_prpgressView setOuterColor:[UIColor redColor]];

        [_prpgressView setInnerColor:[UIColor yellowColor]];

        [_prpgressView setEmptyColor:[UIColor grayColor]];

        _prpgressView.progress = 0;

        [_scrollView addSubview: _prpgressView];

        

    }

    

    //保存按钮

    if (_saveButton == nil) {

        _saveButton = [[UIButton buttonWithType:UIButtonTypeCustom]retain];

        [_saveButton setImage:[UIImage imageNamed:@"compose_savebutton_background.png"] forState:UIControlStateNormal];

        [_saveButton setImage:[UIImage imageNamed:@"compose_savebutton_background_highlighted.png"] forState:UIControlStateHighlighted];

        _saveButton.frame = CGRectMake(kScreenWidth - 23 - 20, kScreenHeight - 19 - 20, 23, 19);

        [_saveButton addTarget:self action:@selector(saveAction) forControlEvents:UIControlEventTouchUpInside];

        [self.window addSubview:_saveButton];

    }

}

//保存图片到本地相册

- (void)saveAction

{

    UIImage *image = _fullImageView.image;

    if (image != nil) {

        //做一个保存提示

        MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.window animated:YES];

        hud.labelText = @"正在保存...";

        hud.dimBackground = YES;

        

        //将图片保存到相册

        UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), hud);

    }

}

//图片保存相册成功调用的方法

- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo

{

    MBProgressHUD *hud = contextInfo;

    hud.customView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"37x-Checkmark.png"]];

    hud.mode = MBProgressHUDModeCustomView;

    hud.labelText = @"保存完成";

    //延迟1秒钟关闭

    [hud hide:YES afterDelay:1.0];

}

- (void)savePhoto:(MBProgressHUD *)hud

{

    NSLog(@"保存完成");

}

//添加方法手势（需要给大图片的网址）

- (void)addZoom:(NSString *)urlString

{

    self.urlString = urlString;

    //添加手势

    self.userInteractionEnabled = YES;

    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(zoomInAction)];

    [self addGestureRecognizer:tap];

    [tap release];

}

//放大手势

- (void)zoomInAction

{

    [self _initViews];

    [_data release];

    _data = [[NSMutableData alloc]init];

    //设置大图片开始的frame

    CGRect frame = [self convertRect:self.bounds toView:self.window];

    _fullImageView.frame = frame;

    

    _scrollView.backgroundColor = [UIColor clearColor];

    _saveButton.hidden =  YES;

    _prpgressView.hidden = YES;

    [UIView animateWithDuration:.3 animations:^{

        _fullImageView.frame = [UIScreen mainScreen].bounds;

        _scrollView.backgroundColor = [UIColor blackColor];

    } completion:^(BOOL finished) {

        _saveButton.hidden =  NO;

        _prpgressView.hidden = NO;

    }];

    

    //请求网络图片

    NSURL *url = [NSURL URLWithString:self.urlString];

    NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval:30];

    [NSURLConnection connectionWithRequest:request delegate:self];

}

//缩小手势

- (void)zoomOutAction

{

    //去掉保存按钮

    [_saveButton removeFromSuperview];

    [_saveButton release];

    _saveButton = nil;

    //如果进度条没有移除我们就移除

    if (_prpgressView != nil) {

        [_prpgressView removeFromSuperview];

        [_prpgressView release];

        _prpgressView = nil;

    }

    

    [UIView animateWithDuration:.3 animations:^{

        _fullImageView.frame = [self convertRect:self.bounds toView:self.window];

        _scrollView.backgroundColor = [UIColor clearColor];

        

    } completion:^(BOOL finished) {

        //移除视图

        [_scrollView removeFromSuperview];

        [_scrollView release];

        _scrollView = nil;

        [_fullImageView removeFromSuperview];

        [_fullImageView release];

        _fullImageView = nil;

    }];

}

#pragma mark - NSURLConnectionDataDelegate

//服务器响应时调用的协议方法

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response

{

    NSHTTPURLResponse *httpRespone = (NSHTTPURLResponse *)response;

    NSDictionary *dic = [httpRespone allHeaderFields];

    NSLog(@"dic:%@",dic);

    NSString *size = [dic objectForKey:@"Content-Length"];

    _length = [size doubleValue];

}

//接受数据时调用的协议方法

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data

{

    [_data appendData:data];

    _prpgressView.progress = _data.length / _length;

}

//数据加载完成之后调用的协议方法

- (void)connectionDidFinishLoading:(NSURLConnection *)connection

{

    UIImage *image = [UIImage imageWithData:_data];

    _fullImageView.image = image;

    

    //加载完成之后隐藏进度条

    _prpgressView.progress = 1;

    _prpgressView.hidden = YES;

    [_prpgressView removeFromSuperview];

    [_prpgressView release];

    _prpgressView = nil;

    

    //图片等比例拉宽

    //图片的高度 / 图片的宽度   =将要显示视图的高度 /  将要显示视图的宽度

    float height = image.size.height / image.size.width * kScreenWidth;

    _fullImageView.size = CGSizeMake(kScreenWidth, height);

    _scrollView.contentSize = CGSizeMake(kScreenWidth, height);

}

@end