关于设置navigation上的各种属性~

+ (void)initialize{/////////设置barbuttom文字颜色UIBarButtonItem *item = [UIBarButtonItem appearanceWhenContainedIn:self, nil];NSMutableDictionary *titleattr = [NSMutableDictionary dictionary];titleattr[NSForegroundColorAttributeName] = [UIColor whiteColor];[item setTitleTextAttributes:titleattr forState:UIControlStateNormal];//全局设置navigationbar背景[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"NavBar64"] forBarMetrics:UIBarMetricsDefault];//[[UINavigationBar appearance] setBackgroundColor:[UIColor colorWithRed:255.0/255.0 green:240.0/255.0 blue:245.0/255.0 alpha:0]];//当在info里设置不用navController管理状态栏时可以。//[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleLightContent;//箭头左边的颜色[[UINavigationBar appearance] setTintColor:[UIColor whiteColor]];// 全局设置 navigationBar 文字颜色大小UINavigationBar *navBar = [UINavigationBar appearance];NSMutableDictionary *titleattr2 = [NSMutableDictionary dictionary];titleattr2[NSForegroundColorAttributeName] = [UIColor whiteColor];titleattr2[NSFontAttributeName] = [UIFont systemFontOfSize:18];[navBar setTitleTextAttributes:titleattr2];}