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