iOS阶段学习第31天笔记(UINavigationBar介绍)

时间:2021-12-12 04:12:37

iOS学习(UI)知识点整理

一、UINavigationBar 的介绍

1)概念:UINavigationBar 是用于定义导航栏按钮的一个类对象

2)在使用UINavigationBar之前必须先初始化导航栏 实例代码:

 //初始化导航栏
FirstViewController *firstVC = [[FirstViewController alloc] init];
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:firstVC];
self.window.rootViewController = nav; //appearance一定要在初始化之前使用
//修改默认的UINavigationBar的导航条背景颜色,
[[UINavigationBar appearance] setBarTintColor:[UIColor yellowColor]]; //修改默认的导航栏文字即图标颜色
[[UINavigationBar appearance] setTintColor:[UIColor blackColor]]; //设置导航栏背景图片
[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"icon"] forBarMetrics:UIBarMetricsDefault];

3)setNavigationBarHidden 设置隐藏导航栏  例如:

 [self.navigationController setNavigationBarHidden:YES];

4)title 设置导航栏标题  例如:

 self.title = @“First View”;
//注意:在一处做此设置后,后面的视图控制器如未作设置也会使用此标题

5)titleView 用于设置导航栏中间的视图 例如:

    UIView *navBarView = [[UIView alloc] init];
navBarView.frame = CGRectMake(, , , );
navBarView.backgroundColor = [UIColor clearColor];
navBarView.layer.cornerRadius = 8.0f;
navBarView.clipsToBounds = YES; UIButton *btn1 = [[UIButton alloc] init];
btn1.frame = CGRectMake(, , , );
btn1.backgroundColor = [UIColor blueColor];
[btn1 setTitle:@"消息" forState:UIControlStateNormal];
[btn1 addTarget:self action:@selector(btn1Tapped:) forControlEvents:UIControlEventTouchUpInside];
btn1.tag = ;
[navBarView addSubview:btn1]; UIButton *btn2 = [[UIButton alloc] init];
btn2.frame = CGRectMake(, , , );
btn2.backgroundColor = [UIColor blueColor];
[btn2 setTitle:@"电话" forState:UIControlStateNormal];
[btn2 addTarget:self action:@selector(btn1Tapped:) forControlEvents:UIControlEventTouchUpInside];
btn2.tag = ;
[navBarView addSubview:btn2]; //在导航栏中的中间位置加入我们自定义的view,
//程序会把我们设置的view自动居中
self.navigationItem.titleView = navBarView;

6)UIBarButtonItem 导航栏上的按钮元素  常用的系统自带的Bar有

/*
* UIBarButtonSystemItemDone  按钮样式为文字Done、
* UIBarButtonSystemItemAdd 按钮样式为图片的加号
*UIBarButtonSystemItemCamera 按钮样式是图片的照相机
     
*UIBarButtonSystemItemFixedSpace 是一个占位符 ,可以设置width
*UIBarButtonSystemItemFlexibleSpace 是一个占位符,固定宽度,导航栏上单独一个按钮
*/

例如:

 //系统自带照相机按钮
UIBarButtonItem *button1 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCamera
target:self action:@selector(barButtonTapped:)]; //占位符按钮
UIBarButtonItem *button2 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace
target:self action:@selector(barButtonTapped:)];

7)rightBarButtonItem 设置导航栏右侧单个按钮 例如:

 self.navigationItem.rightBarButtonItem = button1;

8)rightBarButtonItems 设置导航栏右侧多个按钮 例如:

 self.navigationItem.rightBarButtonItems = @[button2, button1];

9)edgesForExtendedLayout 设置view的坐标都是从导航栏左下点开始计算 防止导航栏遮挡内容区域
例如:

 self.edgesForExtendedLayout = UIRectEdgeNone;

10)initWithTitle 使用文字作为导航栏按钮 例如:

 UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"返回" style:UIBarButtonItemStylePlain
target:self action:@selector(back)];

11)initWithImage 使用图片作为导航栏按钮 例如:

 UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"st_logout"] 
style:UIBarButtonItemStylePlain target:self action:@selector(back)];
self.navigationItem.leftBarButtonItem = barButtonItem;

12)setToolbarHidden 设置导航栏显示与隐藏 例如:

  [self.navigationController setToolbarHidden:NO];

13)动画效果实现 代码:

 - (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor=[UIColor whiteColor]; firstView=[[UIView alloc]init];
firstView.frame=CGRectMake(, , , );
firstView.backgroundColor=[UIColor blackColor];
[self.view addSubview:firstView];
for (int i=; i<; i++) {
UIButton *btn=[[UIButton alloc]init];
btn.frame=CGRectMake(,, CGRectGetWidth(self.view.frame), );
}
[self moveFirstViewToRight];
} -(void)moveFirstViewToRight{
//UIview 动画
[UIView animateWithDuration:.f animations:^{
firstView.frame=CGRectMake(self.view.frame.size.width-firstView.frame.size.width, , , );
}];
}