Ios7 UINavigationBar更改标题文本颜色和字体大小

我想更改导航标题的字体和颜色。因此，我已经完成了下面的代码。但它不起作用

if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7")) {


    NSDictionary *navbarTitleTextAttributes = [NSDictionary dictionaryWithObjectsAndKeys:
                                               [UIColor whiteColor],
                                               NSForegroundColorAttributeName,
                                               [UIFont fontWithName:@"MyFavoriteFont" size:20.0],
                                               NSFontAttributeName,
                                               nil];
    [[UINavigationBar appearance] setTitleTextAttributes:navbarTitleTextAttributes];
    NSLog(@"setTitleTextAttributes");
}

---

为什么此代码不起作用？

将属性应用于Navigationcontroller实例

if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7")) {
    NSDictionary *navbarTitleTextAttributes = [NSDictionary dictionaryWithObjectsAndKeys:
                                               [UIColor whiteColor],
                                               NSForegroundColorAttributeName,
                                               [UIFont fontWithName:@"MyFavoriteFont" size:20.0],
                                               NSFontAttributeName,
                                               nil];
    [self.transitionNavController.navigationBar setTitleTextAttributes:navbarTitleTextAttributes];
}

如果（[[[UIDevice currentDevice]systemVersion]floatValue]<7.0），希望这有助于…

if([[[UIDevice currentDevice] systemVersion] floatValue] < 7.0)
        {
            [[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"nav_bg.png"] forBarMetrics:UIBarMetricsDefault];
            [[UINavigationBar appearance] setTitleTextAttributes:
             @{
               UITextAttributeTextColor: [UIColor whiteColor],UITextAttributeTextShadowColor: [UIColor clearColor],UITextAttributeTextShadowOffset: [NSValue valueWithUIOffset:UIOffsetMake(0.0f, 1.0f)],UITextAttributeFont: [UIFont fontWithName:@"ArialMT" size:18.0f]
               }];
            CGFloat verticalOffset = -4;
            [[UINavigationBar appearance] setTitleVerticalPositionAdjustment:verticalOffset forBarMetrics:UIBarMetricsDefault];
        }
        else
        {
            [[UINavigationBar appearance] setBarTintColor:[UIColor whiteColor]];

            // Uncomment to change the color of back button
            [[UINavigationBar appearance] setTintColor:[UIColor whiteColor]];

            // Uncomment to assign a custom backgroung image
            [[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"nav_bg.png"] forBarMetrics:UIBarMetricsDefault];

            // Uncomment to change the back indicator image

            [[UINavigationBar appearance] setBackIndicatorImage:[UIImage imageNamed:@""]];
            [[UINavigationBar appearance] setBackIndicatorTransitionMaskImage:[UIImage imageNamed:@""]];

            // Uncomment to change the font style of the title

            NSShadow *shadow = [[NSShadow alloc] init];
            shadow.shadowColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.8];
            shadow.shadowOffset = CGSizeMake(0, 1);

            [[UINavigationBar appearance] setTitleTextAttributes: [NSDictionary dictionaryWithObjectsAndKeys:[UIColor colorWithRed:245.0/255.0 green:245.0/255.0 blue:245.0/255.0 alpha:1.0], NSForegroundColorAttributeName,shadow, NSShadowAttributeName,[UIFont fontWithName:@"ArialMT" size:18.0], NSFontAttributeName, nil]];

            CGFloat verticalOffset = 0;
            [[UINavigationBar appearance] setTitleVerticalPositionAdjustment:verticalOffset forBarMetrics:UIBarMetricsDefault];
        }

{
[[UINavigationBar外观]setBackgroundImage:[UIImage ImageName:@“nav_bg.png”]forBarMetrics:UIBarMetricsDefault]；
[[UINavigationBar外观]setTitleTextAttributes:
@{
UITextAttributeTextColor:[UIColor whiteColor]，UITextAttributeTextShadowColor:[UIColor clearColor]，UITextAttributeTextShadowOffset:[NSValue valueWithUIOffset:UIOffsetMake（0.0f，1.0f）]，UITextAttributeFont:[UIFont fontWithName:@“ArialMT”大小：18.0f]
}];
CGFloat垂直偏移=-4；
[[UINavigationBar外观]setTitleVerticalPositionAdjustment:BarMetrics的垂直偏移量：UIBarMetricsDefault]；
}
其他的
{
[[UINavigationBar外观]SetPartIntColor:[UIColor whiteColor]]；
//取消注释以更改“后退”按钮的颜色
[[UINavigationBar外观]setTintColor:[UIColor whiteColor]]；
//取消注释以指定自定义背景图像
[[UINavigationBar外观]setBackgroundImage:[UIImage ImageName:@“nav_bg.png”]forBarMetrics:UIBarMetricsDefault]；
//取消注释以更改后指示器图像
[[UINavigationBar外观]设置指示符号图像：[UIImage ImageName:@”“]；
[[UINavigationBar外观]收件指示符号转换图像：[UIImage ImageName:@”“]；
//取消注释以更改标题的字体样式
NSShadow*shadow=[[NSShadow alloc]init]；
shadow.shadowColor=[UIColor colorWithRed:0.0绿色：0.0蓝色：0.0 alpha:0.8]；
shadow.shadowOffset=CGSizeMake（0,1）；
[[UINavigationBar外观]setTitleTextAttributes:[NSDictionary Dictionary With Objects and Keys:[UIColor ColorWith红色：245.0/255.0绿色：245.0/255.0蓝色：245.0/255.0 alpha:1.0]，NSForegroundColorAttributeName，shadow，NSShadowAttributeName，[UIFontWithName:@“ArialMT”大小：18.0]，NSFontAttributeName，nil]；
CGFloat垂直偏移=0；
[[UINavigationBar外观]setTitleVerticalPositionAdjustment:BarMetrics的垂直偏移量：UIBarMetricsDefault]；
}