UINavigationController 可以 改變UINavigationBar導航條標題顏色和字體
[self.navigationController.navigationBar setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
[UIColor colorWithRed:0 green:0.7 blue:0.8 alpha:1], UITextAttributeTextColor,
[UIColor colorWithRed:0 green:0.7 blue:0.8 alpha:1], UITextAttributeTextShadowColor,
[NSValue valueWithUIOffset:UIOffsetMake(0, 0)], UITextAttributeTextShadowOffset,
[UIFont fontWithName:@"Arial-Bold" size:0.0], UITextAttributeFont,
nil]];
其中 UITextAttributeTextColor和UITextAttributeFont 屬性是文字顏色和字體