• 1.自定義導航控制器

• 2.重寫自定義導航控制器的initialize類方法

  • 因為該類在第一次使用導航控制器的使用，正符合，因為主題也只需要設置一次

• 3.代碼實現

/**
 * 當第一次使用這個類的時候會調用一次
 */
+ (void)initialize
{
    // 當導航欄用在XMGNavigationController中, appearance設置才會生效
//    UINavigationBar *bar = [UINavigationBar appearanceWhenContainedIn:[self class], nil];
    UINavigationBar *bar = [UINavigationBar appearance];
    [bar setBackgroundImage:[UIImage imageNamed:@"navigationbarBackgroundWhite"] forBarMetrics:UIBarMetricsDefault];
    [bar setTitleTextAttributes:@{NSFontAttributeName : [UIFont boldSystemFontOfSize:20]}];

    // 設置item
    UIBarButtonItem *item = [UIBarButtonItem appearance];
    // UIControlStateNormal
    NSMutableDictionary *itemAttrs = [NSMutableDictionary dictionary];
    itemAttrs[NSForegroundColorAttributeName] = [UIColor blackColor];
    itemAttrs[NSFontAttributeName] = [UIFont systemFontOfSize:17];
    [item setTitleTextAttributes:itemAttrs forState:UIControlStateNormal];
    // UIControlStateDisabled
    NSMutableDictionary *itemDisabledAttrs = [NSMutableDictionary dictionary];
    itemDisabledAttrs[NSForegroundColorAttributeName] = [UIColor lightGrayColor];
    [item setTitleTextAttributes:itemDisabledAttrs forState:UIControlStateDisabled];
}