//創建一個左邊button

UIBarButtonItem *leftButton = [[UIBarButtonItem alloc] initWithTitle:@"<" style:UIBarButtonItemStylePlain target:self action:@selector(clickLeftButton)];

// leftButton.

[leftButton setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:

[UIFont

[UIColor greenColor], NSForegroundColorAttributeName,

nil]

forState:UIControlStateNormal];

//創建一個右邊button

UIBarButtonItem

[rightButton setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:

[UIFont fontWithName:@"Helvetica-Bold"

[UIColor greenColor], NSForegroundColorAttributeName,

nil]

forState:UIControlStateNormal];

改動UINavigationBar （導航欄）上NavigationBarItem 的字體大小和顏色的用法