How to Zoom In & Out image in IPhone

• Select 'View based application' ->Name as 'ZoomDemo'
  
• open ZoomDemoViewController.h file.and write the below code:
  
• @interface ZoomViewController : UIViewController {
  IBOutlet UIScrollView *scrollView;
  IBOutlet UIImageView *imgView;
  }
  @property(nonatomic,retain) IBOutlet UIScrollView *scrollView;
  @property(nonatomic,retain) IBOutlet UIImageView *imgView;
  @end
• Open ZoomDemoViewController.m file and synthesize the scrollView and imgView properties.
  
• @synthesize scrollView,imgView;
  
  // Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
  - (void)viewDidLoad {
  [super viewDidLoad];
  UIImageView *tempImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"SplashScreen.png"]];//WithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://www.austinbull.com/clonemines.png"]]]];
  [self setImgView:tempImageView];
  [tempImageView release];
  
  scrollView.contentSize=CGSizeMake(imgView.frame.size.width,imgView.frame.size.height);
  scrollView.maximumZoomScale=10.0;
  scrollView.minimumZoomScale=0.75;
  scrollView.clipsToBounds=YES;
  scrollView.delegate=self;
  [scrollView addSubview:imgView];
  }
  
  - (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
  return imgView;}
• OPen IB and ZoomDemoViewController.xib file and add one UIScrollview from library
  and map it with 'file'sowner' .
• Add one UIImageView on the UIScrollView and map the imgView to File'sOwner
• Now build and run the app.
  

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