scrollview放大imageview从点击的地方开始放大

-(void)tapAction:(UITapGestureRecognizer *)tap{

    

    CGFloat offsetX = (self.myScrollView.bounds.size.width > self.myScrollView.contentSize.width)?(self.myScrollView.bounds.size.width - self.myScrollView.contentSize.width)/2 : 0.0;

    CGFloat offsetY = (self.myScrollView.bounds.size.height > self.myScrollView.contentSize.height)?(self.myScrollView.bounds.size.height - self.myScrollView.contentSize.height)/2 : 0.0;

    

    CGPoint touchPoint = [tap locationInView:self.myScrollView];

 

if ((self.myScrollView.zoomScale >= metroScale) && (self.myScrollView.zoomScale < metroScale*2)) {

        ///x轴的逻辑是正确的，但是y轴不是从0开始的，，上边有导航栏呢。。。。。

[self.myScrollView zoomToRect:CGRectMake(((touchPoint.x-offsetX)/metroScale), ((touchPoint.y-offsetY)/metroScale)-kNavigationBarHeight-StateBarHeight, metroScale*2, metroScale*2) animated:YES];

        [self.myScrollViewsetZoomScale:metroScale*2animated:YES];

 

} elseif((self.myScrollView.zoomScale >= metroScale*2)&&(self.myScrollView.zoomScale < metroScale*3)){

        ///x轴的逻辑是正确的，但是y轴不是从0开始的，，上边有导航栏呢。。。。。

[self.myScrollView zoomToRect:CGRectMake(((touchPoint.x-offsetX)/(metroScale*2)), ((touchPoint.y-offsetY)/(metroScale*2))-kNavigationBarHeight-StateBarHeight, metroScale*4, metroScale*4) animated:YES];

        [self.myScrollViewsetZoomScale:metroScale*4animated:YES];

}else{

        [self.myScrollViewsetZoomScale:metroScaleanimated:YES];

    }

    

 

}

 

///下面的一个方法，可以实现从点击的地方开始放大，效果不错。。。

-(void)tapAction:(UITapGestureRecognizer *)tap{

-(void)tapAction:(UITapGestureRecognizer *)tap{

    

    CGFloat offsetX = (self.myScrollView.bounds.size.width > self.myScrollView.contentSize.width)?(self.myScrollView.bounds.size.width - self.myScrollView.contentSize.width)/2 : 0.0;

    CGFloat offsetY = (self.myScrollView.bounds.size.height > self.myScrollView.contentSize.height)?(self.myScrollView.bounds.size.height - self.myScrollView.contentSize.height)/2 : 0.0;

    

    CGPoint touchPoint = [tap locationInView:self.myScrollView];

 

if (self.myScrollView.zoomScale != metroScale) {

[self.myScrollViewsetZoomScale:metroScaleanimated:YES];

} else {

        ///x轴的逻辑是正确的，但是y轴不是从0开始的，，上边有导航栏呢。。。。。

[self.myScrollView zoomToRect:CGRectMake(((touchPoint.x-offsetX)/metroScale), ((touchPoint.y-offsetY)/metroScale)-kNavigationBarHeight-StateBarHeight, metroScale*3, metroScale*3) animated:YES];

        [self.myScrollViewsetZoomScale:metroScale*3animated:YES];

}

    

 

}

    

 

}

 

 

 

 

///下面是核心代码

 ///添加touch事件

    UITapGestureRecognizer *myTapGesture = [[UITapGestureRecognizeralloc] initWithTarget:selfaction:@selector(tapAction:)];

   

    myTapGesture.numberOfTapsRequired=2;//默认为1.表示点击的次数。

    [self.myScrollView addGestureRecognizer:myTapGesture];

    

}

 

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView

 

{

    returnself.myImageV;

}

-(void)tapAction:(UITapGestureRecognizer *)tap{

    

    CGFloat offsetX = (self.myScrollView.bounds.size.width > self.myScrollView.contentSize.width)?(self.myScrollView.bounds.size.width - self.myScrollView.contentSize.width)/2 : 0.0;

    CGFloat offsetY = (self.myScrollView.bounds.size.height > self.myScrollView.contentSize.height)?(self.myScrollView.bounds.size.height - self.myScrollView.contentSize.height)/2 : 0.0;

    

    CGPoint touchPoint = [tap locationInView:self.myScrollView];

    kNSLog(@"双击metroScale == %f,,%f,,%f",metroScale,offsetX,offsetY);

if (self.myScrollView.zoomScale != metroScale) {

[self.myScrollViewsetZoomScale:metroScaleanimated:YES];

} else {

        ///x轴的逻辑是正确的，但是y轴不是从0开始的，，上边有导航栏呢。。。。。

[self.myScrollView zoomToRect:CGRectMake(((touchPoint.x-offsetX)/metroScale), ((touchPoint.y-offsetY)/metroScale)-kNavigationBarHeight-StateBarHeight, 1, 1) animated:YES];

}

    

 

}

 

- (void)scrollViewDidZoom:(UIScrollView *)scrollView

{

    float minzoomx = self.myScrollView.frame.size.width / self.myImageV.size.width;

    float minzoomy = self.myScrollView.frame.size.height / self.myImageV.size.height;

    

    if(scrollView.zoomScale > MIN(minzoomx, minzoomy))

    {

//        [self.myImageV setCenter:CGPointMake((scrollView.frame.size.width / 2)/minzoomx, (scrollView.frame.size.height / 2)/minzoomy)];

        NSLog(@"上面。。。。。。。。。。。。。。。");

    }else{

         NSLog(@"下面。");

        if (minzoomy>minzoomx) {

            [self.myImageV setCenter:CGPointMake((scrollView.frame.size.width / 2)/MIN(minzoomx, minzoomy), (scrollView.frame.size.height / 2))];

        }else{

            [self.myImageV setCenter:CGPointMake((scrollView.frame.size.width / 2), (scrollView.frame.size.height / 2)/MIN(minzoomx, minzoomy))];

        }

        

    }

    

}

 

///上面是核心代码

 

 

 

 

 

 

 

 

 

 

///前面的只是表面上好的。。。在最后才真正是对的。。。。。

self.myScrollView.delegate = self;

    float minzoomx = self.myScrollView.frame.size.width / self.myImageV.size.width;

    float minzoomy = self.myScrollView.frame.size.height / self.myImageV.size.height;

    self.myScrollView.minimumZoomScale = MIN(minzoomx, minzoomy);  //最小缩放到当前ScrollView的大小比例

    self.myScrollView.maximumZoomScale = 3.0f; //最大缩放到图片的3倍

    ///设置地铁图的初始化位置。。。

 

    self.myScrollView.zoomScale = MIN(minzoomx, minzoomy);

 ///这个也不能少

 - (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView

 

{

    returnself.myImageV;

    

}

- (void)scrollViewDidZoom:(UIScrollView *)scrollView

{

    if(scrollView.zoomScale < 1.0)

    {

        UIImageView *imageView = [scrollView.subviews lastObject];

        [self.myImageV setCenter:CGPointMake(scrollView.frame.size.width / 2, scrollView.frame.size.height / 2)];

    }

}

 

 

////应该用下面的才行。。。

- (void)scrollViewDidZoom:(UIScrollView *)scrollView

{

    float minzoomx = self.myScrollView.frame.size.width / self.myImageV.size.width;

    float minzoomy = self.myScrollView.frame.size.height / self.myImageV.size.height;

    if(scrollView.zoomScale > 1.0)

    {

        [self.myImageV setCenter:CGPointMake((scrollView.frame.size.width / 2)/minzoomx, (scrollView.frame.size.height / 2)/minzoomy)];

    

    }else{

        [self.myImageV setCenter:CGPointMake((scrollView.frame.size.width / 2), (scrollView.frame.size.height / 2))];

    }

    

    

    

 

}

 

 

////真正行的。。。。。。。

//

//  ShowPDFViewController.m

//  iTotemFramework

//

//  Created by apple on 14-3-5.

//  Copyright (c) 2014年 iTotemStudio. All rights reserved.

//

 

#import "ShowPDFViewController.h"

 

#import "UIImage+PDF.h"

 

@interfaceShowPDFViewController ()

 

@end

 

@implementation ShowPDFViewController

 

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

{

    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

    if (self) {

        // Custom initialization

        self.myData = [NSMutableData data];

    }

    returnself;

}

 

- (void)viewDidLoad

{

    [superviewDidLoad];

    // Do any additional setup after loading the view from its nib.

    [self.navigationItemsetNewTitle:self.myName];

    [self.navigationItemsetBackItemWithTarget:selfaction:@selector(back) title:nil];

    [self.navigationItemsetRightItemWithTarget:selfaction:@selector(rightAction:) image:@"DT_share.png"];

    

}

///分享的方法。。。。。

-(void)rightAction:(id)sender{

    NSString *tempText = [NSStringstringWithFormat:@"这是一张高清%@地铁图，分享自世界邦 - 全球地铁图APP。你也快来试试吧。应用下载地址：%@",self.myName,kAPPURL];

    [UMSocialSnsServicepresentSnsIconSheetView:self

                                         appKey:kUMappKey

                                      shareText:tempText

                                     shareImage:self.myShareImage

                                shareToSnsNames:[NSArrayarrayWithObjects:UMShareToSina,UMShareToWechatSession,UMShareToWechatTimeline,nil]

                                       delegate:nil];

    

    ///微信，朋友圈分享。。

    //设置微信分享应用类型，用户点击消息将跳转到应用，或者到下载页面

    //UMSocialWXMessageTypeImage 为纯图片类型

    [UMSocialDatadefaultData].extConfig.wxMessageType = UMSocialWXMessageTypeWeb;

//    [UMSocialData defaultData].extConfig.wxMessageType = UMSocialWXMessageTypeImage;

    //分享图文样式到微信朋友圈显示字数比较少，只显示分享标题

    [UMSocialDatadefaultData].extConfig.title = @"朋友圈分享内容";

    //设置微信好友或者朋友圈的分享url,下面是微信好友，微信朋友圈对应wechatTimelineData

    [UMSocialDatadefaultData].extConfig.wechatSessionData.url = @"http://www.shijiebang.com/topic/mobile/railway/";

    [UMSocialDatadefaultData].extConfig.wechatTimelineData.url = @"http://www.shijiebang.com/topic/mobile/railway/";

}

-(void)viewWillDisappear:(BOOL)animated{

    [super viewWillDisappear:animated];

    [MobClickendLogPageView:@"显示地铁图页面"];

}

///页面出来后。。。

-(void)viewDidAppear:(BOOL)animated{

    [super viewDidAppear:animated];

    if ([kUserDefault objectForKey:self.myURL]!=NULL) {

        [self showSubway];

    }

    else{

        if (![ViewControllerFactoryisnetworkOK]) {

            //            [self.view.window showHUDWithText:@"该地铁图还没有下载，请检查联网！" Type:ShowLoading Enabled:YES];

            [ViewControllerFactoryshowMessageAlert:@"该地铁图还没有下载，请检查联网！"];

        }else{

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

            NSURLRequest *request = [NSURLRequest requestWithURL:url];

            //发起请求，定义代理

            [NSURLConnectionconnectionWithRequest:request delegate:self];

            flag = 0;

            ///初始化一个imageView

            self.tempView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 80, 90)];

            self.tempView.backgroundColor = [UIColorclearColor];

            self.tempView.center = CGPointMake(kScreenWidth/2, (kScreenHeight-kNavigationBarHeight-kStateBarHeight)/2);

            

            self.tempImageView = [[UIImageView alloc]initWithFrame:CGRectMake(10, 0, 60, 55)];

            self.tempLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 55, 80, 30)];

            self.tempLabel.textAlignment = NSTextAlignmentCenter;

            self.tempLabel.font = [UIFont fontWithName:@"Arial" size:13];

            self.tempLabel.backgroundColor = [UIColorclearColor];

            

            [self.tempViewaddSubview:self.tempImageView];

            [self.tempView addSubview:self.tempLabel];

            [self.view addSubview:self.tempView];

            [self.view bringSubviewToFront:self.tempView];

        }

    }

 

}

///页面出来前

-(void)viewWillAppear:(BOOL)animated{

    [super viewWillAppear:animated];

    [MobClickendLogPageView:@"显示地铁图页面"];

}

 

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

    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response;

    if(httpResponse && [httpResponse respondsToSelector:@selector(allHeaderFields)]){

        NSDictionary *httpResponseHeaderFields = [httpResponse allHeaderFields];

        total_ = [[httpResponseHeaderFields objectForKey:@"Content-Length"] longLongValue];

    }

}

// 分批返回数据

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

 

    [self.myData appendData:data];

    double a = [self.myData length];

    float jindu = a/total_;

    int imageFlag = (int)(jindu*24);

    NSString *imageString = [NSString stringWithFormat:@"%d",imageFlag];

    self.tempLabel.text = [NSString stringWithFormat:@"加载中%d%%",(int)(jindu*100)];

    self.tempImageView.image = kImageNamed(imageString);

}

// 数据完全返回完毕

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {

    ///下面的两句其实已经给imageView赋值了。。。。。

    UIImage *tempImage = [UIImageoriginalSizeImageWithPDFData:self.myData];

    self.myImageV.image = tempImage;

    [self.tempViewremoveFromSuperview];

    

    tempWidth = tempImage.size.width;

    tempHeight = tempImage.size.height;

    self.myImageV.size = CGSizeMake(tempWidth, tempHeight);///关键是这句话。。。。。

    self.myScrollView.frame = CGRectMake(0, 0, kScreenWidth, kScreenHeight-kNavigationBarHeight-StateBarHeight);

    self.myScrollView.contentSize = CGSizeMake(self.myImageV.size.width, self.myImageV.size.height);

    

    self.myScrollView.delegate = self;

    float minzoomx = self.myScrollView.frame.size.width / tempWidth;

    float minzoomy = self.myScrollView.frame.size.height / tempHeight;

    self.myScrollView.minimumZoomScale = MIN(minzoomx, minzoomy);  //最小缩放到当前ScrollView的大小比例

    self.myScrollView.maximumZoomScale = 3.0f; //最大缩放到图片的3倍

    

    ///设置地铁图的初始化位置。。。

    self.myScrollView.zoomScale = MIN(minzoomx, minzoomy);

    

    

    [kUserDefaultsetObject:self.myDataforKey:self.myURL];

    [kUserDefaultsynchronize];

    

    self.myShareImage = [ViewControllerFactoryyasuoCameraImage:tempImage];///这是为了分享用的。。。。。。

    

    ///添加touch事件

    UITapGestureRecognizer *myTapGesture = [[UITapGestureRecognizeralloc] initWithTarget:selfaction:@selector(tapAction:)];

    self.myImageV.userInteractionEnabled = YES;

    myTapGesture.numberOfTapsRequired=2;//默认为1.表示点击的次数。

    [self.myImageV addGestureRecognizer:myTapGesture];

}

 

-(void)showSubway{

 

    

    UIImage *tempImage = [UIImage originalSizeImageWithPDFData:[kUserDefault objectForKey:self.myURL]];

    self.myImageV.image = tempImage;

    

    tempWidth = tempImage.size.width;

    tempHeight = tempImage.size.height;

    self.myImageV.size = CGSizeMake(tempWidth, tempHeight);///关键是这句话。。。。。

    self.myScrollView.frame = CGRectMake(0, 0, kScreenWidth, kScreenHeight-kNavigationBarHeight-StateBarHeight);

    self.myScrollView.delegate = self;

    float minzoomx = self.myScrollView.frame.size.width / tempWidth;

    float minzoomy = self.myScrollView.frame.size.height / tempHeight;

    self.myScrollView.minimumZoomScale = MIN(minzoomx, minzoomy);  //最小缩放到当前ScrollView的大小比例

    self.myScrollView.maximumZoomScale = 3.0f; //最大缩放到图片的3倍

    ///设置地铁图的初始化位置。。。

    self.myScrollView.zoomScale = MIN(minzoomx, minzoomy);

    self.myShareImage = [ViewControllerFactoryyasuoCameraImage:tempImage];///这是为了分享用的。。。。。。

    

    

    ///添加touch事件

    UITapGestureRecognizer *myTapGesture = [[UITapGestureRecognizeralloc] initWithTarget:selfaction:@selector(tapAction:)];

    self.myImageV.userInteractionEnabled = YES;

    myTapGesture.numberOfTapsRequired=2;//默认为1.表示点击的次数。

    [self.myImageV addGestureRecognizer:myTapGesture];

    

}

 

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView

 

{

    returnself.myImageV;

}

-(void)tapAction:(id)sender{

    NSLog(@"轻拍,,,双击");

    float minzoomx = self.myScrollView.frame.size.width / tempWidth;

    float minzoomy = self.myScrollView.frame.size.height / tempHeight;

    

    CGFloat zs = self.myScrollView.zoomScale;

    zs = (zs == MIN(minzoomx, minzoomy)) ? 1.0 : MIN(minzoomx, minzoomy);

    

    [UIViewbeginAnimations:nilcontext:NULL];

    [UIViewsetAnimationDuration:0.6];

    self.myScrollView.zoomScale = zs;

    [UIViewcommitAnimations];

 

}

 

- (void)scrollViewDidZoom:(UIScrollView *)scrollView

{

    float minzoomx = self.myScrollView.frame.size.width / self.myImageV.size.width;

    float minzoomy = self.myScrollView.frame.size.height / self.myImageV.size.height;

    

    if(scrollView.zoomScale > MIN(minzoomx, minzoomy))

    {

//        [self.myImageV setCenter:CGPointMake((scrollView.frame.size.width / 2)/minzoomx, (scrollView.frame.size.height / 2)/minzoomy)];

        NSLog(@"上面。。。。。。。。。。。。。。。");

    }else{

         NSLog(@"下面。");

        if (minzoomy>minzoomx) {

            [self.myImageV setCenter:CGPointMake((scrollView.frame.size.width / 2)/MIN(minzoomx, minzoomy), (scrollView.frame.size.height / 2))];

        }else{

            [self.myImageV setCenter:CGPointMake((scrollView.frame.size.width / 2), (scrollView.frame.size.height / 2)/MIN(minzoomx, minzoomy))];

        }

        

    }

    

}

 

- (void)didReceiveMemoryWarning

{

    [superdidReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

 

 

@end

 

 

@end