Can I set image as a title to UINavigationBar?

You can use an UIImageView for the UINavigationItem.titleView property, something like:

self.navigationItem.titleView = myImageView;

I find that a transparent .png at about 35px in height has worked well.

- (void)awakeFromNib {

//put logo image in the navigationBar

UIImageView* img = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"logo.png"]];
self.navigationItem.titleView = img;
[img release];

}

You can do it right from storyboard (as of Xcode 7):

1. Create a view outside main view of view controller. It can be a nested view or just an image
2. Add navigation item to your view controller
3. Ctrl+ drag from navigation item and drop on outside view

4.select title view