When i was learning how to use UIScrollview for a controls like image or label. Scrolling is not worked properly so i google for it then i finally found then we need to give contentsize above the scrollview height and width.
Following code gives you image zooming and scrolling.
- First create a navigation based application or create a window based application in .h file declare the UIScrollView and UIImageview and add the scrollviewdelegete to zoom the image
@interface ScrollingImage : UIViewController
UIScrollView *scrollView; UIImageView *imageView;
}
@property (nonatomic, retain) UIScrollView *scrollView;
@property (nonatomic, retain) UIImageView *imageView;
@end
2) In .m file synthesize the scrollView and imageView and in dealloc delegate release them both.
#import "ScrollingImage.h"
@implementation ScrollingImage
@synthesize scrollView, imageView;
- (void)dealloc {
[super dealloc]; [imageView release]; [scrollView release];
}
//To zoom
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{ return imageView;
}
// 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:@"Lighthouse.jpg"]]; self.imageView = tempImageView;
tempImageView.frame = CGRectMake(0, 0, 320, 370); scrollView.pagingEnabled = NO; scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0,0,320, 370)];
scrollView.contentSize = CGSizeMake(scrollView.frame.size.width + 150 , scrollView.frame.size.height + 150); scrollView.maximumZoomScale = 10.0; scrollView.minimumZoomScale = 1; scrollView.delegate = self; scrollView.scrollsToTop = NO; scrollView.backgroundColor = [UIColor whiteColor]; scrollView.showsHorizontalScrollIndicator=YES; scrollView.showsVerticalScrollIndicator=YES; [scrollView addSubview:imageView]; [self.view addSubview:scrollView]; [tempImageView release];
}
Now build and go in the simulator to run the application.
