Use uiscrollview to zoom in, zoom out, and move an image.

1. Implement uiscrollviewdelegate

-(Uiview *) viewforzoominginscrollview :( uiscrollview *) scrollview {

Uiview * subview = [scrollview
Viewwithtag: 22];

Return subview;

}

-(Void) scrollviewdidendzooming :( uiscrollview *) scrollview withview :( uiview
*) View atscale :( float) scale {

}

Two functions;

Construct the corresponding View Control

Uiimage * image = [uiimage
Imagenamed: @ "1807.jpg"];

Uiscrollview * scrollview = [uiscrollview
Alloc]
Initwithframe: Self. View. bounds];

[Scrollview
Setcontentsize: image. Size];

Scrollview. Delegate =
Self;

Scrollview. minimumzoomscale =
0.2;

Scrollview. maximumzoomscale =
5.0;

Scrollview. backgroundcolor = [uicolor
Lightgraycolor];

[Self. View
Addsubview: scrollview];

[Scrollview
Release];

Uiimageview * imageview = [[uiimageview
Alloc] initwithimage: Image];

[Scrollview
Addsubview: imageview];

Imageview. Tag =
22;

[Imageview
Release];