UIScrollView with image - ios

Question

Is it possible to use a UIScrollView to see an image that is about 800px long? I tried using a UIScrollView and the UIImageView but it's not scrolling. Anybody can help please?

Answer 1

Use:
UIScrollView *yourScrollview = [[UIScrollView alloc] initWithFrame:(CGRect){{0,0}, {320,480}}];
UIImageView *yourImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"yourImageHere.png"]];
yourImageView.frame = yourScrollview.bounds;
yourScrollview.contentSize = yourImageView.frame.size;
yourScrollview.minimumZoomScale = 0.4;
yourScrollview.maximumZoomScale = 4.0;
[yourScrollview setZoomScale:yourScrollview.minimumZoomScale];
yourScrollview.delegate = self;
[self.view addSubview:yourScrollview];
Don't forget to add UIScrollViewDelegate in your .h file
Note: ARC code

Answer 2

1. Create a new Project -> Single View Application
2. Put the follow code into:
"ViewController.m"
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
-(void) viewDidLoad
{
[super viewDidLoad];
UIScrollView * scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
[scrollView setContentSize:CGSizeMake(320, 800)];
UIView * myView = [[UIView alloc] initWithFrame : CGRectMake(0, 0, 320, 800)];
UIImageView * myImage = [[UIImageView alloc]initWithImage : [UIImage imageNamed:#"Test.png"]];
[myView addSubview: myImage];
[myImage release];
[scrollView addSubview: myView];
[myView release];
[self.view addSubview: scrollView];
[scrollView release];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return YES;
}
#end
3. Put the Image "Test.png" into your Project (Drag Drop into Xcode -> Folder:Supporting Files)

Answer 3

If it is not panning it means you forgot to set the contentSize property. I have a tutorial on my website that shows how to embed a UIImageView inside a UIScrollView and set it up for both panning and zooming. It includes complete downloadable source code. See Panning and Zooming with UIScrollView

Answer 4

#interface ZoomViewController : UIViewController <uiscrollviewdelegate> {
IBOutlet UIScrollView *scroll;
UIImageView *image;
}
#property (nonatomic, retain) UIScrollView *scroll;
#end
</uiscrollviewdelegate></uikit>
Once check your Viewdidload method.
- (void)viewDidLoad {
image = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"img_body.png"]];
[super viewDidLoad];
image = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"img_body.png"]];
scroll.contentSize = image.frame.size;
[scroll addSubview:image];
scroll.minimumZoomScale = 0.4;
scroll.maximumZoomScale = 4.0;
scroll.delegate = self;
[scroll setZoomScale:scroll.minimumZoomScale];
[super viewDidLoad];
}