How to put an image in the center of navigationBar of a UIViewController?

Question

I have this snippet of code used in viewDidLoad of a UIViewController. I\'va no errors. Images exists. I get the background but not the image. Image is a sort of logo.

Answer 1

Perhaps not what you meant, but I ran into this page looking for a way to provide a centered background image for the navigation bar, so in case you're here for that... here's one way.

Stealing a little bit from another answer, you can break your image into foreground and background, then build a new image that stretches the background and centers the foreground, and then set that as your nav bar's background image. Building the image works like so:

// build an image by stretching the bg, then merging it with the fg
CGSize barSize = self.navController.navigationBar.frame.size;
UIImage *fg = [UIImage imageNamed:@"some_fg"];
UIImage *bg = [[UIImage imageNamed:@"some_bg"]
               resizableImageWithCapInsets:UIEdgeInsetsMake(0.f,1.f,0.f,1.f)];
UIGraphicsBeginImageContextWithOptions(barSize, NO, 0.0);
[bg drawInRect:CGRectMake(0, 0, barSize.width, barSize.height)];
[fg drawInRect:CGRectMake((barSize.width-fg.size.width)/2.f,
                          0,
                          fg.size.width,
                          fg.size.height)];
// grab the merged images
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();