IOS:实现对图片的双击放大、移动、捏合操作

//

//  EditPhotoView.m

//  FaceStar

//

//  Created by Monster on 12-12-21.

//  Copyright (c) 2012年 FaceStar. All rights reserved.

//

#import "EditPhotoView.h"

#import "IconSelectViewController.h"

#define kScreenWidth  768

#define kScreenHeight  1024

#define kMaxZoom 3.0

@implementation EditPhotoView;

@synthesize imgView = _imgView;

@synthesize url = _url;

@synthesize width = _width;

@synthesize height = _height;       

@synthesize activityIndicatorView = _activityIndicatorView;

@synthesize isTwiceTaping = _isTwiceTaping;

@synthesize scrollView = _scrollView;

@synthesize currentScale = _currentScale;

@synthesize isDoubleTapingForZoom = _isDoubleTapingForZoom;

@synthesize  touchX = _touchX;

@synthesize  touchY = _touchY;

@synthesize offsetY = _offsetY;

@synthesize aImage = _aImage;

#if 1

- (id)initWithFrame:(CGRect)frame

{

   self = [superinitWithFrame:frame];

   if (self)

    {

        // Initialization code

        //_imgView = [[UIImageView alloc]initWithImage:[imageDelegate getImge]];

       _width =768;

       _height =1024;

    }

    return self;

}

// Only override drawRect: if you perform custom drawing.

// An empty implementation adversely affects performance during animation.

- (void)drawRect:(CGRect)rect

{

    [selfdraw];

}

- (void) draw

{

    //self.frame = CGRectMake(0, 0, kScreenWidth, kScreenHeight);

    self.backgroundColor = [UIColorblackColor];

   self.alpha =0.0;

    

    _scrollView = [[UIScrollViewalloc]initWithFrame:CGRectMake(0,0,kScreenWidth,kScreenHeight)];

    [selfaddSubview:_scrollView];

    //_scrollView.delegate = self;

    _scrollView.maximumZoomScale =5.0;

    CGFloat ratio =_width/_height*kScreenHeight/kScreenWidth;

   CGFloat min =MIN(ratio,1.0);

    _scrollView.minimumZoomScale = min;

    

   CGFloat height =_height /_width *kScreenWidth;

    _imgView = [[UIImageViewalloc]initWithFrame:CGRectMake(_scrollView.contentOffset.x+100,_scrollView.contentOffset.y+230,10,10)];

    

    [_imgView initWithImage:_aImage];

    //[_imgView initWithImage:[UIImage imageNamed:@"LoginBg.png"]];

    //UIImage* img = [imageDelegate getImage];

    //NSLog(@"%@",img);

    

    //[_imgView initWithImage:[imageDelegate getImage]];

    //NSLog(@"%@",[imageDelegate getImge]);

    //[_imgView loadImage:_url];

    

   CGFloat y = (kScreenHeight - height)/2.0;

   _offsetY =0.0-y;

    _scrollView.contentSize =CGSizeMake(kScreenWidth,kScreenHeight);

    [_scrollView addSubview:_imgView];

    [_imgViewrelease];

   _scrollView.contentOffset =CGPointMake(0,0.0-y);

    

    [UIViewanimateWithDuration:0.6

                         delay:0.0

                        options:UIViewAnimationCurveEaseOut

                    animations:^{

                        _imgView.frame =CGRectMake(0,0,kScreenWidth, height);

                        self.alpha =1.0;

                     }

                    completion:^(BOOL finished){

                     }

     ];

    

    

   UITapGestureRecognizer *tapImgView = [[UITapGestureRecognizeralloc]initWithTarget:selfaction:@selector(tapImgViewHandle)];

    tapImgView.numberOfTapsRequired =1;

    tapImgView.numberOfTouchesRequired =1;

    [selfaddGestureRecognizer:tapImgView];

    

   UITapGestureRecognizer *tapImgViewTwice = [[UITapGestureRecognizeralloc]initWithTarget:selfaction:@selector(tapImgViewHandleTwice:)];

    tapImgViewTwice.numberOfTapsRequired =2;

    tapImgViewTwice.numberOfTouchesRequired =1;

    [selfaddGestureRecognizer:tapImgViewTwice];

    [tapImgViewrequireGestureRecognizerToFail:tapImgViewTwice];

    [tapImgViewrelease];

    [tapImgViewTwicerelease];

    

    //UITapGestureRecognizer *saveTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(saveTapHandler)];

    

    //UIButton *save = [UIButton generateImage:@"save-pic-button.png" hover:@"save-pic-button-hover.png" withX:245 withY:420];

    //[save addGestureRecognizer:saveTap];

    //[self addSubview:save];

    

    //_activityIndicatorView = [commonFunctions generateActivityIndicatorView];

    //[self addSubview:_activityIndicatorView];

}

#pragma mark - UIscrollViewDelegate zoom

-(void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale

{

   _currentScale = scale;

    NSLog(@"current scale:%f",scale);

}

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

{

    return_imgView;

}

-(void)scrollViewDidZoom:(UIScrollView *)scrollView

{

    //当捏或移动时，需要对center重新定义以达到正确显示未知

   CGFloat xcenter = scrollView.center.x,ycenter = scrollView.center.y;

    NSLog(@"adjust position,x:%f,y:%f",xcenter,ycenter);

    xcenter = scrollView.contentSize.width > scrollView.frame.size.width?scrollView.contentSize.width/2 :xcenter;

    ycenter = scrollView.contentSize.height > scrollView.frame.size.height ?scrollView.contentSize.height/2 : ycenter;

    //双击放大时，图片不能越界，否则会出现空白。因此需要对边界值进行限制。

    if(_isDoubleTapingForZoom)

    {

        NSLog(@"taping center");

        xcenter =kMaxZoom*(kScreenWidth -_touchX);

        ycenter =kMaxZoom*(kScreenHeight -_touchY);

       if(xcenter > (kMaxZoom -0.5)*kScreenWidth){//放大后左边超界

            xcenter = (kMaxZoom -0.5)*kScreenWidth;

        }elseif(xcenter <0.5*kScreenWidth){//放大后右边超界

            xcenter =0.5*kScreenWidth;

        }

       if(ycenter > (kMaxZoom -0.5)*kScreenHeight){//放大后左边超界

            ycenter = (kMaxZoom -0.5)*kScreenHeight +_offsetY*kMaxZoom;

        }elseif(ycenter <0.5*kScreenHeight){//放大后右边超界

            ycenter =0.5*kScreenHeight +_offsetY*kMaxZoom;

        }

        NSLog(@"adjust postion sucess, x:%f,y:%f",xcenter,ycenter);

    }

    [_imgViewsetCenter:CGPointMake(xcenter, ycenter)];

}

#pragma mark - tap

-(void)tapImgViewHandle

{

    return;

    NSLog(@"%d",_isTwiceTaping);

    if(_isTwiceTaping){

       return;

    }

    NSLog(@"tap once");

    

    [UIViewanimateWithDuration:0.6

                         delay:0.0

                        options:UIViewAnimationCurveEaseOut

                    animations:^{

                        _imgView.frame =CGRectMake(_scrollView.contentOffset.x+100,_scrollView.contentOffset.y+230,10,10);

                        self.alpha =0.0;

                     }

                    completion:^(BOOL finished){

                         [selfremoveFromSuperview];

                     }

     ];

    

}

-(IBAction)tapImgViewHandleTwice:(UIGestureRecognizer *)sender

{

   _touchX = [senderlocationInView:sender.view].x;

   _touchY = [senderlocationInView:sender.view].y;

    if(_isTwiceTaping)

    {

       return;

    }

    _isTwiceTaping =YES;

    

    NSLog(@"tap twice");

    

    if(_currentScale >1.0)

    {

        _currentScale =1.0;

        [_scrollViewsetZoomScale:1.0animated:YES];

    }else

    {

        _isDoubleTapingForZoom =YES;

        _currentScale =kMaxZoom;

        [_scrollViewsetZoomScale:kMaxZoomanimated:YES];

    }

    _isDoubleTapingForZoom =NO;

    //延时做标记判断，使用户点击3次时的单击效果不生效。

    [selfperformSelector:@selector(twiceTaping)withObject:nilafterDelay:0.65];

    NSLog(@"sdfdf");

}

-(void)twiceTaping

{

   NSLog(@"no");

    _isTwiceTaping =NO;

}

-(void) saveTapHandler

{

    if([_activityIndicatorViewisAnimating])

    {

       return;

    }

    [_activityIndicatorViewstartAnimating] ;

   UIImageWriteToSavedPhotosAlbum(_imgView.image,self,@selector(imageSavedToPhotosAlbum: didFinishSavingWithError: contextInfo:),nil);

}

#pragma mark - savePhotoAlbumDelegate

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

{

   NSString *message;

   NSString *title;

    

    [_activityIndicatorViewstopAnimating];

   if (!error)

    {

        title =@"恭喜";

        message =@"成功保存到相册";

    }else

    {

        title =@"失败";  

        message = [errordescription];  

    }  

    UIAlertView *alert = [[UIAlertViewalloc]initWithTitle:titlemessage:messagedelegate:nilcancelButtonTitle:@"确定"otherButtonTitles:nil]; 

    [alertshow];

    [alertrelease];

}

#endif

-(void)dealloc

{

    [superdealloc];

    [_scrollView release];

}

@end