iPhone: Display image at its original size - iphone

Question

I am trying to set frame for imageview to original size of image and display it in center of view. I have written following code for this but image still appears in whole screen! Suppose image size is 320x88, it appears resized/stretched to 320x460! I want it to appear in center of screen so I set Y coordinate to (460-88)/2 but it doesn't work. Could anyone please help me to resolve this. Thanks.
UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageWithContentsOfFile:filePath]];
if(imageView.image.size.width == IPHONE4_RES_WIDTH)
[imageView setFrame: CGRectMake(0, 0, imageView.image.size.width/2, imageView.image.size.height/2)];
UIViewController *viewController = [[[UIViewController alloc] init] autorelease];
viewController.view.backgroundColor = [UIColor blackColor];
NSLog(#"%f : %f",viewController.view.bounds.size.height, imageView.bounds.size.height);
viewController.view = imageView;
viewController.view.contentMode = UIViewContentModeCenter;
[self.navigationController pushViewController:viewController animated:YES];

Answer 1

try this
viewController.view.contentMode=UIViewContentModeCenter;

Answer 2

you can set the uiimageview to not stretch the image.. even if it is full size it will show the image in the center when you set
imageView.contentMode = UIViewContentModeCenter

Answer 3

Ran across this question while trying to achieve the same in a storyboard file. Just as an addition: in storyboard for the same thing you can select Mode = Center of UIImageView

Answer 4

Following works perfectly for my requirements!
UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageWithContentsOfFile:filePath]];
// Reduce the width and height for iPhone 4 res
if(imageView.image.size.width == IPHONE4_RES_WIDTH)
[imageView setFrame: CGRectMake(0, 0, imageView.image.size.width/2, imageView.image.size.height/2)];
UIViewController *viewController = [[[UIViewController alloc] init] autorelease];
viewController.view.backgroundColor = [UIColor blackColor];
float X = (viewController.view.bounds.size.width - imageView.bounds.size.width)/2;
float Y = (viewController.view.bounds.size.height - imageView.bounds.size.height)/2 - 50; // Size of tabbar and navigation bar deducted
NSLog(#"(%f, %f) : (%f,%f)",X,Y,imageView.bounds.size.width,imageView.bounds.size.height);
[viewController.view addSubview:imageView];
//viewController.view = imageView;
//viewController.view.contentMode = UIViewContentModeCenter;
// Set in the center of the screen
if(imageView.image.size.width == IPHONE4_RES_WIDTH)
[imageView setFrame: CGRectMake(X, Y, imageView.image.size.width/2, imageView.image.size.height/2)];
else
[imageView setFrame: CGRectMake(X, Y, imageView.image.size.width, imageView.image.size.height)];
[self.navigationController pushViewController:viewController animated:YES];