iOS项目9.三级视图控制器

效果图

项目分析

三级视图控制器

1. 标签控制器 -> 导航控制器 -> 视图控制器，这就叫三级视图控制器
2. 一个导航控制器对应于一个视图控制器，
3. 标签控制器是管理固定的几个视图控制器，子控制器是并列的。
4. UITabBarController用数组管理视图控制器，而导航控制器所管理的视图控制器之间的关系是上下级关系

设置window

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
RootViewController *rootVC = [[RootViewController alloc] init];
//权限最高的给根视图控制器
self.window.rootViewController = rootVC; 
// Override point for customization after application launch.
return YES;
}

数组赋值示例

NSArray *vcArray = @[profielVC,messageVC,colaVC,userVC,moreVC];
NSMutableArray *tabArray = [NSMutableArray arrayWithCapacity:vcArray.count];

背景颜色赋值为图片

_tabBarView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"mask_navbar"]];

UIButton设tag值

 //区分是点击了哪个button
//iOS中100以前的tag值有特殊用法，所以最好在100以后
btn.tag = 100 + i; 

UITabBarController的属性

//选择的是哪个tab
self.selectedIndex = button.tag - 100;

//隐藏系统默认的样式
self.tabBar.hidden = YES;

//用数组管理视图控制器
self.viewControllers = tabArray;

Tab子视图调用根视图方法(UITabBarController)

RootViewController *rootVC = (RootViewController *)self.tabBarController;
[rootVC showTabBar:NO];

动画效果在于CGPoint or frame的改变

[UIView animateWithDuration:0.2 animations:^{
    _selectView.center = button.center;
} completion:nil];


//重新赋值frame,让tabBar消失
[UIView animateWithDuration:0.2 animations:^{
    self.tabBarView.frame = frame;
} completion:nil];

UIButton的设置

//需要custom类型才能设置图片
UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];

//[pushButton setImage:(UIImage *) forState:(UIControlState)]
//标题和图片不能同时设置
[pushButton setTitle:@"Push" forState:UIControlStateNormal];

视图顶部导航栏左右按钮

//自定义导航栏按钮
- (void)initNavButton{

UIButton *writeBtn = [UIButton buttonWithType:UIButtonTypeCustom];
//导航按钮的xy值没有用
writeBtn.frame = CGRectMake(0, 0, writeButtonWidth, writeButtonHeight);
[writeBtn setBackgroundImage:[UIImage imageNamed:@"write"] forState:UIControlStateNormal];
[writeBtn addTarget:self action:@selector(presentAction) forControlEvents:UIControlEventTouchUpInside];
//添加自定义按钮
UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithCustomView:writeBtn];
self.navigationItem.rightBarButtonItem = item;
}

视图跳转 - 模态视图

呈现使用present

[self presentViewController:modalVC animated:YES completion:nil];

退出使用dissmiss

- (void)dismissAction{
[self dismissViewControllerAnimated:YES completion:nil];
}

视图跳转 - push视图

呈现用导航视图push/show

- (void)pushAction{
PushViewController *pushVC = [[PushViewController alloc] init];
[self.navigationController pushViewController:pushVC animated:YES];
//[self.navigationController showViewController:pushVC sender:nil];
RootViewController *rootVC = (RootViewController *)self.tabBarController;
[rootVC showTabBar:NO];
}    

退出用pop 的三种方式

- (void)popAction{

    // 回到上级视图
    [self.navigationController popViewControllerAnimated:YES];

    // 跳转到某视图
    //[self.navigationController popToViewController:<#(nonnull UIViewController *)#> animated:<#(BOOL)#>]

    // 跳转到根视图
    //[self.navigationController popToRootViewControllerAnimated:YES];
}