iphone UIScrollView缩放

allImageScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 768, 1024)];
allImageScrollView.minimumZoomScale = 0.3;
allImageScrollView.maximumZoomScale = 1.0;
allImageScrollView.backgroundColor = [UIColor clearColor];
allImageScrollView.delegate = self;
[self.view addSubview:allImageScrollView];

mPicStatusesViewController = [[PicStatusesViewController alloc] init];
[allImageScrollView addSubview:mPicStatusesViewController.view];

//UIScrollView Delegete 实现

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

{
    return mPicStatusesViewController.view; //返回ScrollView上添加的需要缩放的视图
}

- (void)scrollViewDidZoom:(UIScrollView *)scrollView

{
    //缩放操作中被调用
}

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

{
    //缩放结束后被调用
  }

原文地址：http://ios-iphone.diandian.com/post/2011-09-15/5066984

 

 

 

MyScrollView.h

 

#import <UIKit/UIKit.h>

@interface MyScrollView : UIScrollView <UIScrollViewDelegate> {
    UIImage *image;
    UIImageView *imageView;
}

@property (nonatomic, retain) UIImage *image;

@end

 

MyScrollView.m

 

#import "MyScrollView.h"

@implementation MyScrollView

@synthesize image;

- (id)initWithFrame:(CGRect)frame {
    if ((self = [super initWithFrame:frame])) {
        self.delegate = self;
        self.minimumZoomScale = 0.5;
        self.maximumZoomScale = 2.5;
        self.showsVerticalScrollIndicator = NO;
        self.showsHorizontalScrollIndicator = NO;

        imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
        imageView.contentMode = UIViewContentModeCenter;
        [self addSubview:imageView];
    }
    return self;
}

- (void)setImage:(UIImage *)img {
    imageView.image = img;
}

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
    return imageView;
}

- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale {
    CGFloat zs = scrollView.zoomScale;
    zs = MAX(zs, 1.0);
    zs = MIN(zs, 2.0);

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.3];
    scrollView.zoomScale = zs;
    [UIView commitAnimations];
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [touches anyObject];

    if ([touch tapCount] == 2) {
        CGFloat zs = self.zoomScale;
        zs = (zs == 1.0) ? 2.0 : 1.0;

        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:0.3];
        self.zoomScale = zs;
        [UIView commitAnimations];
    }
}

- (void)dealloc {
    [image release];
    [imageView release];

    [super dealloc];
}

@end

 

MainViewController.h

 

#import "MyScrollView.h"

@interface MainViewController : UIViewController <UIScrollViewDelegate> {
    IBOutlet UIScrollView *scrView;

    NSInteger lastPage;
}

@end

 

MainViewController.m

 

#import "MainViewController.h"

@implementation MainViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.view.backgroundColor = [UIColor blackColor];

    scrView.contentSize = CGSizeMake(1700, 480);
    scrView.showsHorizontalScrollIndicator = NO;

    for (int i = 0; i < 5; i++) {
        MyScrollView *ascrView = [[MyScrollView alloc] initWithFrame:CGRectMake(340 * i, 0, 320, 480)];
        NSString *imgPath = [[NSBundle mainBundle] pathForResource:[NSString stringWithFormat:@"%d", i + 1] ofType:@"jpg"];
        ascrView.image = [UIImage imageWithContentsOfFile:imgPath];
        ascrView.tag = 100 + i;

        [scrView addSubview:ascrView];
        [ascrView release];
    }

    lastPage = 0;
}

//划动的动画结束后调用
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
    CGFloat pageWidth = scrollView.frame.size.width;
    NSInteger page = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;

    if (lastPage != page) {
        MyScrollView *aView = (MyScrollView *)[scrView viewWithTag:100 + lastPage];
        aView.zoomScale = 1.0;

        lastPage = page;
    }
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

- (void)viewDidUnload {
    scrView = nil;
}

- (void)dealloc {
    [scrView release];
    [super dealloc];
}

@end

本文转载：http://2015.iteye.com/blog/1575003