IOS手指控制图片的缩放

我不是女神ヾ 2023-10-18 11:43 75阅读 0赞

//
    //  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