scrollview里面多张图片，每张都能放大缩小

http://blog.sina.com.cn/s/blog_5d68044001018s1n.html

scrollview里面多张图片，每张都能放大缩小

- (void)viewDidLoad
{
    [super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];
    
    UITapGestureRecognizer *doubleTap =[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTap:)];
    [doubleTap setNumberOfTapsRequired:2];

self.imageScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 768, 980)];
    self.imageScrollView.backgroundColor = [UIColor clearColor];
    self.imageScrollView.scrollEnabled = YES;
    self.imageScrollView.pagingEnabled = YES;
    self.imageScrollView.delegate = self;
    self.imageScrollView.contentSize = CGSizeMake(768*array.count, 980);
    for (int i = 0; i
        UITapGestureRecognizer *doubleTap =[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTap:)];
        [doubleTap setNumberOfTapsRequired:2];
        
        UIScrollView *s = [[UIScrollView alloc] initWithFrame:CGRectMake(768*i, 0, 768, 980)];
        s.backgroundColor = [UIColor clearColor];
        s.contentSize = CGSizeMake(768, 980);
        s.delegate = self;
        s.minimumZoomScale = 1.0;
        s.maximumZoomScale = 3.0;
        //        s.tag = i+1;
        [s setZoomScale:1.0];
        
        UIImageView *imageview = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 768, 980)];
        NSString *imageName = [array objectAtIndex:i];
        imageview.image = [UIImage imageNamed:imageName];
        imageview.userInteractionEnabled = YES;
        imageview.tag = i+1;
        [imageview addGestureRecognizer:doubleTap];
        [s addSubview:imageview];
        [self.imageScrollView addSubview:s];
        
        [doubleTap release];
        [imageview release];
        [s release];
    }
    
    [self.view addSubview:self.imageScrollView];
    
    
}
#pragma mark - ScrollView delegate
-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
    
    for (UIView *v in scrollView.subviews){
        return v;
    }
    return nil;
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    imageScrollView=nil;
    //nameArray =nil;
}
- (void)dealloc
{
    [imageScrollView release];
    //  [nameArray release];
    [super dealloc];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
if(interfaceOrientation ==UIInterfaceOrientationPortrait||interfaceOrientation ==UIInterfaceOrientationPortraitUpsideDown)
    {
        return YES;
    }
    return NO;
}

-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
    
    if (scrollView == self.imageScrollView){
        CGFloat x = scrollView.contentOffset.x;
        if (x==offset){
            
        }
        else {
            offset = x;
            for (UIScrollView *s in scrollView.subviews){
                if ([s isKindOfClass:[UIScrollView class]]){
                    [s setZoomScale:1.0];
                }
            }
        }
    }
}

//- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale {
//    [scrollView setZoomScale:scale+1.0 animated:YES];
//    [scrollView setZoomScale:scale animated:YES];
//}
#pragma mark -
-(void)handleDoubleTap:(UIGestureRecognizer *)gesture{
    
    float newScale = [(UIScrollView*)gesture.view.superview zoomScale] * 1.5;
    CGRect zoomRect = [self zoomRectForScale:newScale  inView:(UIScrollView*)gesture.view.superview withCenter:[gesture locationInView:gesture.view]];
    [(UIScrollView*)gesture.view.superview zoomToRect:zoomRect animated:YES];
}