知识点:
1.UINavigationController
2.UINavigationItem
3.UINavigationBar
4.UINavigationController视图切换
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UINavigationController
1.什么是导航控制器
作用：管理视图控制器
2.UINavigationController对象创建
1）初始化方式
- (id)initWithRootViewController:(UIViewController *)rootViewController
2)UINavigationController组成:
（1）navigationBar(高度44)
（2）customContent — 有自定义的ViewController提供
（3）navigationToolbar(高度44)
3.通过UINavigationController对象切换视图
1）将视图控制器压入导航控制器的栈容器中
- (void)pushViewController:(UIViewController *)viewController
animated:(BOOL)animated
2）将视图控制器从导航控制器中弹出
- (UIViewController *)popViewControllerAnimated:(BOOL)animated
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UINavigationItem
UINavigationItem包含了：
（1）backBarButtonItem(由上一级ctl的属性决定)
（2）title/titleView(当前ctl)
（3）rightBarButtonItem(当前ctl)
（4）leftBarButtonItem(当前ctl)
1.UINavigationItem和UIViewController关系
navigationItem是UIViewController的一个属性
这个属性是为UINavigationController服务的
2.创建UIBarButtonItem
1）创建系统自带的UIBarButtonSystemItem
- (id)initWithBarButtonSystemItem:(UIBarButtonSystemItem)systemItem
target:(id)target
action:(SEL)action;
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemBookmarks target:self action:@selector(btnAction)];
2）文字UIBarButtonItem的创建方式
- (id)initWithTitle:(NSString *)title
style:(UIBarButtonItemStyle)style
target:(id)target
action:(SEL)action
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem new];
3）图片UIBarButtonItem的创建方式
- (id)initWithImage:(UIImage *)image
style:(UIBarButtonItemStyle)style
target:(id)target
action:(SEL)action
self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"refresh_30"] style:UIBarButtonItemStylePlain target:nil action:nil];
3）如何将UIBarButtonItem加入到导航的左边和右边
@property (nonatomic, retain) UIBarButtonItem *leftBarButtonItem
@property (nonatomic, retain) UIBarButtonItem *rightBarButtonItem
@property (nonatomic, retain) UIBarButtonItem *backBarButtonItem
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:b];
3.定制UIBarButtonItem
4.定制导航中间的titleView
self.navigationItem.title = @"控制器2";
5.定制backBarButtonItem
注意:设置当前控制器的backBarButtonItem需要在下一个控制器中才能显示
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UINavigationBar
1.如何往UINavigationBar贴图
设置背景图片
- (void)setBackgroundImage:(UIImage *)backgroundImage
forBarMetrics:(UIBarMetrics)barMetrics
[self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"1.png"] forBarMetrics:UIBarMetricsDefault];
2.如何设置UINavigationBar设置颜色
@property (nonatomic, retain) UIColor *tintColor
@property (nonatomic, retain) UIColor *barTintColor
3.如何设置透明颜色
1）设置UINavigationBar的样式
@property (nonatomic, assign) UIBarStyle barStyle
self.navigationController.navigationBar.barStyle= UIBarStyleBlack;
2）是否透明
@property (nonatomic, assign, getter=isTranslucent) BOOL translucent
//获取管理当前视图控制器的导航控制器（如果这个视图控制器没有受到导航控制器管理，此方法会返回空指针）
//设置导航栏为不透明,坐标点会自动下移64个单位
self.navigationController.navigationBar.translucent = NO;
3）改变导航栏的颜色
@property(nonatomic,retain) UIColor *barTintColor
//设置背景色
self.navigationController.navigationBar.barTintColor = [UIColor colorWithRed:arc4random()%256/255.0 green:arc4random()%256/255.0 blue:arc4random()%256/255.0 alpha:1.0];
4.如何隐藏UINavigationBar
1）不带动画隐藏
@property (nonatomic, getter=isNavigationBarHidden) BOOL navigationBarHidden
//显示
self.navigationController.navigationBarHidden = NO;
2）带动画隐藏
- (void) setNavigationBarHidden:(BOOL)navigationBarHidden
animated:(BOOL)animated
[self.navigationController setNavigationBarHidden:YES animated:YES];
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UINavigationController视图切换
1.获取导航控制器中的视图数组
@property (nonatomic, copy) NSArray *viewControllers
2.将视图控制器压入导航控制器的栈容器中
- (void)pushViewController:(UIViewController *)viewController
animated:(BOOL)animated
//视图控制器入栈
[self.navigationController pushViewController:ctlA animated:YES];
3.将视图控制器从导航控制器中弹出
- (UIViewController *)popViewControllerAnimated:(BOOL)animated
4.切换至指定的视图控制器(该控制器必须在当前导航控制器中的栈中)
- (NSArray *)popToViewController:(UIViewController *)viewController
animated:(BOOL)animated
5.回到根视图控制器
- (NSArray *)popToRootViewControllerAnimated:(BOOL)animated