如何在导航栏中放置 UIImage 使其成为徽标?

I would like to place a logo/image in the left side of NavigationBar. I try this in codes, but it is not worked properly.

UIImage *logo = [UIImage imageNamed:@"logo.png"];
UIImageView *imageView = [[UIImageView alloc] initWithImage: logo];
imageView.frame = CGRectMake(2, 2, 40, 40);
self.navigationItem.titleView = [[UIImageView alloc] initWithImage:logo];

我尝试先放置视图，然后将图像放置为 UIImageView，但对齐不好.而且在运行代码时视图似乎是空白...

I try with view to be placed first then place image as UIImageView but alignment is not good. And moreover view appears to be white space while run the code..

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