要设置标题的字体大小，我使用了以下条件..也许对任何人都有帮助

if ([currentTitle length]>24) msize = 10.0f;
    else if ([currentTitle length]>16) msize = 14.0f;
    else if ([currentTitle length]>12) msize = 18.0f;

这适用于我在Swift:

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

要设置标题的字体大小，我使用了以下条件..也许对任何人都有帮助

if ([currentTitle length]>24) msize = 10.0f;
    else if ([currentTitle length]>16) msize = 14.0f;
    else if ([currentTitle length]>12) msize = 18.0f;

为了保持问题的最新，我将添加Alex R. R.解决方案，但在Swift中:

self.navigationController.navigationBar.barTintColor = .blueColor()
self.navigationController.navigationBar.tintColor = .whiteColor()
self.navigationController.navigationBar.titleTextAttributes = [
    NSForegroundColorAttributeName : UIColor.whiteColor()
]

结果是:

可以在appdelegate文件中使用此方法，并可以在每个视图中使用

+(UILabel *) navigationTitleLable:(NSString *)title
{
CGRect frame = CGRectMake(0, 0, 165, 44);
UILabel *label = [[[UILabel alloc] initWithFrame:frame] autorelease];
label.backgroundColor = [UIColor clearColor];
label.font = NAVIGATION_TITLE_LABLE_SIZE;
label.shadowColor = [UIColor whiteColor];
label.numberOfLines = 2;
label.lineBreakMode = UILineBreakModeTailTruncation;    
label.textAlignment = UITextAlignmentCenter;
[label setShadowOffset:CGSizeMake(0,1)]; 
label.textColor = [UIColor colorWithRed:51/255.0 green:51/255.0 blue:51/255.0 alpha:1.0];

//label.text = NSLocalizedString(title, @"");

return label;
}

为了让Erik B的伟大解决方案在你的应用程序的不同UIViewController中更有用，我建议为UIViewController添加一个类别，并在里面声明他的setTitle:title方法。像这样，你将在所有视图控制器上得到标题颜色的改变，而不需要复制。

有一点需要注意的是，你不需要[super setTItle:tilte];在Erik的代码中，你需要显式地调用self。Title = @"my new Title "在你的视图控制器中用于这个方法被调用

@implementation UIViewController (CustomeTitleColor)

- (void)setTitle:(NSString *)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 blueColor]; // Change to desired color

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

@end