IOS手指控制图片的缩放

//
//  MoveScaleImageController.h
//  MoveScaleImage
//
//  Created by  on 12-4-24.
//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
//
#import <UIKit/UIKit.h>
#import "MoveScaleImageView.h"
@interface MoveScaleImageController : UIViewController<UIScrollViewDelegate>{
    UIScrollView *myScrollView;
    UIImageView *myImageView;
}
@property(retain,nonatomic)UIScrollView *myScrollView;
@property(retain,nonatomic)UIImageView *myImageView;
@end
//
//  MoveScaleImageController.m
//  MoveScaleImage
//
//  Created by  on 12-4-24.
//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
//
#import "MoveScaleImageController.h"
@interface MoveScaleImageController ()
@end
@implementation MoveScaleImageController
@synthesize myScrollView;
@synthesize myImageView;
-(void)dealloc{
    [myScrollView release];
    [myImageView release];
    [super dealloc];
}
-(void)loadView{
    [super loadView];
    self.view.backgroundColor = [UIColor lightGrayColor];
//    UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(110, 200, 100, 50)];
//    [btn setFrame:CGRectMake(110, 200, 100, 40)];
    [btn setBackgroundColor:[UIColor whiteColor]];
    [btn setTitle:@"点击查看图片" forState:UIControlStateNormal];
    [btn.titleLabel setFont:[UIFont systemFontOfSize:13]];
    [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [btn addTarget:self action:@selector(clickEvent:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn];
    [btn release];
    //下面是我要剪切区域的覆盖层
//    if(self.centerOverLayView==nil)
//    {
//        UIView *centerView=[[UIView alloc] initWithFrame:CGRectMake(20, 100, 280, 210)];
//        self.centerOverLayView=centerView;
//        [centerView release];
//    }
//    self.centerOverLayView.backgroundColor=[UIColor clearColor];
//    self.centerOverLayView.layer.borderColor=[UIColor orangeColor].CGColor;
//    self.centerOverLayView.layer.borderWidth=2.0;
//    [self.view addSubview:self.centerOverLayView];
}
-(void)clickEvent:(id)sender{
    NSLog(@"***********clickeventad");
    myScrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
    if(self.myScrollView==nil)
    {
        UIScrollView *scrollView=[[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
        self.myScrollView=scrollView;
        [scrollView release];
    }
    self.myScrollView.backgroundColor=[UIColor blueColor];
    self.myScrollView.delegate=self;
    self.myScrollView.multipleTouchEnabled=YES;
    self.myScrollView.minimumZoomScale=1.0;
    self.myScrollView.maximumZoomScale=10.0;
    [self.view addSubview:self.myScrollView];
    UIImage *_image = [UIImage imageNamed:@"image.jpg"];
    CGFloat imageView_X = (_image.size.width > self.view.frame.size.width) ? self.view.frame.size.width : _image.size.width;
    CGFloat imageView_Y;
    CGFloat origin;
    if(_image.size.width > self.view.frame.size.width){
        origin = self.view.frame.size.width/_image.size.width;
        imageView_Y = _image.size.height*origin;
    }
    myImageView = [[UIImageView alloc]initWithFrame:CGRectMake((self.view.frame.size.width-imageView_X)/2, (self.view.frame.size.height-imageView_Y)/2, imageView_X, imageView_Y)];
    if(self.myImageView==nil)
    {
        UIImageView *imageView=[[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
        self.myImageView=imageView;
        [imageView release];
    }
//    [myImageView setImage:_image];
    UIImage *originImage=[[UIImage alloc]initWithCGImage:_image.CGImage];
    [myImageView setImage:originImage];
//    [myImageView setFrame:CGRectMake(0, 0, _image.size.width, _image.size.height)];
    [self.myScrollView addSubview:self.myImageView];
    UIButton *closeBtn = [[UIButton alloc]initWithFrame:CGRectMake(10, 10, 50, 50)];
    [closeBtn setBackgroundColor:[UIColor redColor]];
    [closeBtn setAlpha:0.5];
    [closeBtn addTarget:self action:@selector(closeEvent:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:closeBtn];
    [closeBtn release];
//    UIView *backView = [[UIView alloc] initWithFrame:CGRectInset(self.view.frame, 5, 5)];
//    backView.alpha = 0.5;
//    backView.backgroundColor = [UIColor blackColor];
    [self.view addSubview:backView];
//    
//    UIImage* image=[UIImage imageNamed:@"image.jpg"];
//    MoveScaleImageView*fileContent = [[MoveScaleImageView alloc]initWithFrame:CGRectMake(0, 44, 320, 436)];
//    [fileContent setImage:image];
//    
    [backView addSubview:fileContent];
//    [self.view addSubview:fileContent];
//    
//    [backView release];
//    [fileContent release];
}
-(void)closeEvent:(id)sender{
    [self.myImageView setHidden:YES];
    [self.myScrollView setHidden:YES];
}
#pragma mark UIScrollView delegate methods
//实现图片的缩放
-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
    NSLog(@"**************viewForZoomingInScrollView");
    return self.myImageView;
}
//实现图片在素芳过程中居中
- (void)scrollViewDidZoom:(UIScrollView *)scrollView
{
    CGFloat offsetX = (scrollView.bounds.size.width > scrollView.contentSize.width)?(scrollView.bounds.size.width - scrollView.contentSize.width)/2 : 0.0;
    CGFloat offsetY = (scrollView.bounds.size.height > scrollView.contentSize.height)?(scrollView.bounds.size.height - scrollView.contentSize.height)/2 : 0.0;
    self.myImageView.center = CGPointMake(scrollView.contentSize.width/2 + offsetX,scrollView.contentSize.height/2 + offsetY);
}
- (void)viewDidLoad
{
    [super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
@end