18HWThread_UINavigationController_Title_Button_Hidden_UseStoryBoard

大纲

一、作业Homework_CircleMove0314
理论：不可在分线程中刷新UI，否则无法实现预期界面效果。

二、UINavigationController
项目：UINavigationController0315
理论：
栈：后进先出 队列：先进先出

导航(NavController)：继承于UIViewController，根据栈的原理，实现多个视图的之间的切换功能。

界面跳转方法共4种：①root②模态弹出③
④UINavigationController：
步骤：
1.创建ViewController
2.创建NavigationController，且设置vc为nav的root
3.将nav设置为window的root
进栈：pushViewController: animated:
出栈：pop
方法1：（到上一vc）popViewController
方法2：（到root）popToRootViewController
方法3：（到任意vc）popToViewController

三、Navigation_Title_Button
项目：Navigation_Title_Button0315
理论：
1.显示导航栏标题
1.1 方法1：self.title
1.2 方法2：self.navigationItem.title

2.添加导航按钮
2.1 系统提供的方式
①initWithBarButtonSystemItem: target: action:
②initWithTitle: style: target: action:
③initWithImage: style: target: action:
2.2 自定义方式
步骤：
1.创建button，设置其bounds/action等
2.声明UIBarButtonItem，并initWithCustomView:button
3.将button添加到nav

四、隐藏导航栏
项目：NavigationBar0315
理论：
设置导航隐藏：self.navigationController.navigationBarHidden = YES;
位置：一般设置在viewWillAppear:

五、使用storyBoard创建导航栏
项目：Navigation_UseStoryBoard0315
理论：
1.选中storyboard
2.点击Editor→Embed In→Navigation Controller

正文

一、作业Homework_CircleMove0314
理论：不可在分线程中刷新UI，否则无法实现预期界面效果。
源码：

- (void)viewDidLoad
{
    [super viewDidLoad];
    //1.在圆心添加太阳
    UIImageView *sun = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"fireball"]];
    sun.center = CGPointMake(CENTER_X, CENTER_Y);
    sun.bounds = CGRectMake(0, 0, 60, 60);
    [self.view addSubview:sun];
    //2.在圆周上添加地球
    UIImageView *earth = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"a"]];
    earth.center = CGPointMake(CENTER_X+RADIOUS, CENTER_Y);
    earth.bounds = CGRectMake(0, 0, 60, 60);
    [self.view addSubview:earth];
    //3.开启分线程
    [NSThread detachNewThreadSelector:@selector(newThread:) toTarget:self withObject:earth];
}
//分线程
//处理耗时数据
- (void)newThread:(UIImageView *)earth
{
 //无限循环
    for (; ; )
    {
        [NSThread sleepForTimeInterval:0.01];
        //根据角度，计算x，y坐标
        static float angle = 0;
        angle += 1;
        float huDu = angle / 180 * M_PI;
        _x = CENTER_X + RADIOUS * cos(huDu);
        _y = CENTER_Y + RADIOUS * sin(huDu);
        [self performSelectorOnMainThread:@selector(refreshUI:) withObject:earth waitUntilDone:NO];
    }
}
//主线程
//刷新UI
- (void)refreshUI:(UIImageView *)earth
{
    earth.center = CGPointMake(_x, _y);
}

二、UINavigationController
项目：UINavigationController0315
理论：
栈：后进先出 队列：先进先出

导航(NavController)：继承于UIViewController，根据栈的原理，实现多个视图的之间的切换功能。

界面跳转方法共4种：①root②模态弹出③
④UINavigationController：
步骤：
1.创建ViewController
2.创建NavigationController，且设置vc为nav的root
3.将nav设置为window的root
进栈：pushViewController: animated:
出栈：pop
方法1：（到上一vc）popViewController
方法2：（到root）popToRootViewController
方法3：（到任意vc）popToViewController

源码：
文件：AppDelegate.m

    //1.创建视图控制器
    ViewController1 *vc1 = [[ViewController1 alloc]init];
    //2.创建导航控制器,设置vc1为导航的根视图控制器
    UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:vc1];
    //3.将nav作为window的根视图控制器
    self.window.rootViewController = nav;

文件：ViewController1.m

//下一页
//从vc1跳转到vc2，实现压栈（push/视图换入）
- (IBAction)nextClick:(UIButton *)sender
{
    //1.创建vc2
    ViewController2 *vc2 = [[ViewController2 alloc]init];
    //2.压栈，push
    [self.navigationController pushViewController:vc2 animated:YES];
}

文件：ViewController2.m

//从vc2跳转到vc1，实现视图的换出（pop/出栈）
//由3种方式
- (IBAction)backClick:(UIButton *)sender
{
    //pop
    //方法1：直接返回到上一级界面
    [self.navigationController popViewControllerAnimated:YES];
    //方法2：返回到根视图控制器
    [self.navigationController popToRootViewControllerAnimated:YES];
    //方法3：
    [self.navigationController popToViewController: animated:YES];
}
//跳转到vc3
- (IBAction)nextClick:(UIButton *)sender
{
    ViewController3 *vc3 = [[ViewController3 alloc]init];
    [self.navigationController pushViewController:vc3 animated:YES];
}

文件：ViewController4.m

//vc4到vc2
- (IBAction)backClick:(UIButton *)sender
{
    //第三种pop
    //先找到vc2
    //1.获取数组
    NSArray *vcArr = [self.navigationController viewControllers];
    //2.获取vc2
    ViewController2 *vc2 = [vcArr objectAtIndex:1];
    //3.popTo vc2
    [self.navigationController popToViewController:vc2 animated:YES];
}

三、Navigation_Title_Button
项目：Navigation_Title_Button0315
理论：
1.显示导航栏标题
1.1 方法1：self.title
1.2 方法2：self.navigationItem.title

2.添加导航按钮
2.1 系统提供的方式
1>initWithBarButtonSystemItem: target: action:
2>initWithTitle: style: target: action:
3>initWithImage: style: target: action:
2.2 自定义方式
步骤：
1.创建button，设置其bounds/action等
2.声明UIBarButtonItem，并initWithCustomView:button
3.将button添加到nav

源码：

    //1.显示导航标题
    //方法1：
    //title:Localized title for use by a parent controller
    self.title = @"主题";
    //方法2：
    //navigationItem:
    //The navigation item used to represent the view controller in a parent’��s navigation bar. (read-only)
    self.navigationItem.title = @"设置";
    
    //2.添加导航按钮
    //2.1 系统提供的几种方式
    //（1）系统图形按钮
    UIBarButtonItem *item1 = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemCamera target:self action:@selector(photoClick:)];
    //self.navigationItem.rightBarButtonItem = item1;
    //（2）文字按钮
    UIBarButtonItem *item2 = [[UIBarButtonItem alloc]initWithTitle:@"删除" style:UIBarButtonItemStylePlain target:self action:@selector(deleteClick)];
//    self.navigationItem.leftBarButtonItem = item2;
    //（3）图片按钮
    //创建图片
    UIImage *image =  [UIImage imageNamed:@"scratch"];
    //设置图片渲染模式
    image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    //使用渲染过后的图片
    UIBarButtonItem *item3 = [[UIBarButtonItem alloc]initWithImage:image style:UIBarButtonItemStylePlain target:self action:@selector(animationButton)];
    //创建item数组
    NSArray *itemArr = [[NSArray alloc]initWithObjects:item1,item3, nil];
    //将item数组赋给nav
    self.navigationItem.rightBarButtonItems = itemArr;
    
    //2.2 自定义
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    //注意：位置坐标不起作用
//    button.center = CGPointMake(100, 30);
    button.bounds = CGRectMake(0, 0, 40, 40);
    button.backgroundColor = [UIColor redColor];
    [button addTarget:self action:@selector(click) forControlEvents:UIControlEventTouchUpInside];
    UIBarButtonItem *item4 = [[UIBarButtonItem alloc]initWithCustomView:button];
    NSArray *itemArr2 = [[NSArray alloc]initWithObjects:item2,item4, nil];
    self.navigationItem.leftBarButtonItems = itemArr2;

四、隐藏导航栏
项目：NavigationBar0315
理论：
设置导航隐藏：self.navigationController.navigationBarHidden = YES;
位置：一般设置在viewWillAppear:

源码：

//在将要显示时，设置Hidden
//而不是在viewDidLoad设置
- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    self.navigationController.navigationBarHidden = YES;
}

五、使用storyBoard创建导航栏
项目：Navigation_UseStoryBoard0315
理论：
1.选中storyboard
2.点击Editor→Embed In→Navigation Controller