self.navigationItem.title=@"Extras";
[self.navigationController.navigationBar setTitleTextAttributes: [NSDictionary dictionaryWithObjectsAndKeys:[UIFont fontWithName:@"HelveticaNeue" size:21], NSFontAttributeName,[UIColor whiteColor],UITextAttributeTextColor,nil]];

根据Steven Fisher的回答，我写了这样一段代码:

- (void)setTitle:(NSString *)title
{
    [super setTitle:title];
    UILabel *titleView = (UILabel *)self.navigationItem.titleView;
    if (!titleView) {
        titleView = [[UILabel alloc] initWithFrame:CGRectZero];
        titleView.backgroundColor = [UIColor clearColor];
        titleView.font = [UIFont boldSystemFontOfSize:20.0];
        titleView.shadowColor = [UIColor colorWithWhite:0.0 alpha:0.5];

        titleView.textColor = [UIColor yellowColor]; // Change to desired color

        self.navigationItem.titleView = titleView;
        [titleView release];
    }
    titleView.text = title;
    [titleView sizeToFit];
}

这段代码的优点，除了正确地处理帧，是如果你改变你的控制器的标题，自定义标题视图也会得到更新。无需手动更新。

另一个很大的优势是，它使得启用自定义标题颜色非常简单。您所需要做的就是将这个方法添加到控制器中。

在iOS 5中，你可以这样改变navigationBar标题的颜色:

navigationController.navigationBar.titleTextAttributes = @{NSForegroundColorAttributeName: [UIColor yellowColor]};

方法一，设置为IB:

方法二，一行代码:

navigationController?.navigationBar.barTintColor = UIColor.blackColor()

这适用于我在Swift:

navigationController?.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName:UIColor.white]

又短又甜。

[[[self navigationController] navigationBar] setTitleTextAttributes:@{NSForegroundColorAttributeName: [UIColor redColor]}];