UINavigationBar colore del testo del titolo cambiamento e dimensione

Question

voglio cambiare il font del titolo di navigazione e color..so, per questo ho fatto questo sotto code..but non il suo lavoro ...

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"); 
} 

perché questo codice non funziona?

Answer 1

Applicare attributi all'istanza Navigationcontroller.

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]; 
} 

Spero che questo aiuti ...

Answer 2

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]; 
     }