1.设置NavigationBar的背景色：
self.navigationController.navigationBar.barTintColor = [UIColor redColor];
2.设置NavigationBar上的标题
self.navigationItem.title = @"Test";
3.设置NavigationBar上标题的字体大小和颜色（使用富文本）
self.navigationController.navigationBar.titleTextAttributes = [NSDictionary dictionaryWithObjectsAndKeys:[UIColor yellowColor],NSForegroundColorAttributeName,[UIFont systemFontOfSize:50],NSFontAttributeName, nil];
4.设置NavigationBar背景图：
[self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"1"] forBarMetrics:UIBarMetricsDefault];
5.隐藏／显示返回键
在需要隐藏返回键的界面设置：
self.navigationItem.hidesBackButton = NO;
6.保留返回箭头，去除返回标题或者改成其他标题
在push进来的上一级界面中设置：
UIBarButtonItem *backItem = [[UIBarButtonItem alloc] init]；
backItem.title = @"";（不要标题就设置空字符串，其他标题直接写字符串就好了）
self.navigationItem.backBarButtonItem = backItem;
7.修改返回键以及标题颜色
self.navigationController.navigationBar.tintColor = [UIColor whiteColor];
8.自定义rightButton
方法一：
UIBarButtonItem ＊button＝ [[UIBarButtonItem alloc] initWithImage:nil style:UIBarButtonItemStyleDone target:self action:@selector(action:)];
self.navigation.rightBarButtonItem = button;
方法二：
UIButton *button =[ [UIButton alloc] initWithFrame:CGRectMake(0,0,30,30)];
[button setImage:[UIImage imageNamed:@“”] forState:UIControlStateNormal];
[button addTarget:self action:@selector(action:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *rightItem = [[UIBarButtonItem alloc] initWithCustomView:button];
self.navigationItem.rightBarButtonItem = rightItem;