how to do zooming image xcode?? [closed] - iphone

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i have a problem. I have this code a zoom doesn't work.
- (void)viewDidLoad
{
UIImage *image = [UIImage imageNamed:#"zoomimage.jpeg"];
CGRect yFrame = CGRectMake(0.0, 0.0, 320, 432);
imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0.0, 0.0, image.size.width, image.size.height)];
[imageView setImage:image];
scrollView = [[UIScrollView alloc] initWithFrame:yFrame];
[scrollView setScrollEnabled:YES];
[scrollView setBackgroundColor:[UIColor blackColor]];
[scrollView setContentSize:CGSizeMake(image.size.width, image.size.height)];
scrollView.minimumZoomScale = 0.4;
scrollView.maximumZoomScale = 4.0;
[scrollView setZoomScale:scrollView.minimumZoomScale];
[self.view addSubview:scrollView];
[self.view bringSubviewToFront:scrollView];
[scrollView addSubview:imageView];
}

Answer 1

First, set the delegate of scrollview to your self.
scrollView.delegate = self;
Now, Add this delegate method of UIScrollView in your class to enable zooming on the image.
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return imageView;
}

Answer 2

Try this:
.h Controller:
#interface MyViewController : UIViewController{
IBOutlet UIScrollView *scrollView;
UIImageView *imageView;
}
#property (nonatomic, retain) UIScrollView *scrollView;
#property (nonatomic, retain) UIImageView *imageView;
.m Controller:
#synthesize scrollView, imageView;
-(UIView *)viewForZoomingInScrollView:(UIScrollVi­ew *)scrollView{
return imageView;
}
- (void)viewDidLoad
{
UIImageView *tempImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"YourImageName.png"]];
self.imageView = tempImageView;
[tempImageView release];
scrollView.maximumZoomScale = 3.0;
scrollView.minimumZoomScale = 0.6;
scrollView.clipsToBounds = YES;
scrollView.delegate = self;
[scrollView addSubview:imageView];
}
This code worked for me :)