UI_07导航控制器

UINavigationController : 继承于UIViewController
导航控制器, 是iOS中最常用的多视图控制器之一, 用来管理多个视图控制器

导航控制器以栈的方式管理所控制的视图控制器, 只要要有一个被管理的视图控制器, 这个控制器称作 : 导航控制器的根视图控制器

• 创建导航控制器的根视图控制器
  首先需要创建一个继承于UIViewController的类:MainViewController, 然后在AppDelegate.m里创建

//  主要代码:MainViewController *mainVC = [MainViewController alloc]init];UINavigationController *naVC = [[UINacigationController alloc]initWithRootViewController: mainVC];self.windwo.rootViewController = naVC;[mainVC release];[naVC release];    **不要忘记对dealloc 和  window进行释放**

• 在MainViewController.m中, 进行基本设置
  
  • 注意 : 导航视图控制器的高度是44, 上面的状态栏高度是20, 加在一起默认高度是64

// 1.外观设置   背景颜色: (注意:不是所有的背景颜色都是backgroundColor)   self.navigationController.navigationBar.bartintColor = [UIcolor grayColor];// 2.设置标题    self.title = @"猫眼电影"  // 方法1// 3.内容设置    self.navigationItem.title = @"猫眼电影"; // 设置标题:方法2    做一些指定的视图,作为titleView    UISegementedControl *seg = [[UISegementedControl alloc]initWithItem: @[@"信息", @"通话"]];    self.navigationItem.titleView = seg; // 4.有关UINavigationBar     是导航条,默认为半透明, 为了防止坐标系被篡改,我们把它从透明设置成不透明,这样坐标系原点自动向下推64    self.nacigationController.navigationBar.translucent = NO;   // 5.创建左右两边按钮,默认左边是back     self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:@selector(leftButtonAction:)] autorelease]; //系统自带按钮     self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"32.png"] style: UIBarButtonItemStylePlain target:self action:@selector(rightButtonAction:)]autorelease]; //自定义图案    //**创建按钮的时候,可以通过initWithBarButtonSystemItem来使用系统自带的按钮,也可以自定义图案,但用上面方式创建的图案为系统默认的蓝色,要想使自定义的图案以原来的形式显示, 可以进行如下改动:     UIButton *ringhtButton = [UIButton buttonWithType:UIButtonTypeCustom];    ringhtButton.frame = CGRectMake(0, 0, 40, 40);    [ringhtButton setImage:[UIImage imageNamed:@"32.png"] forState:UIControlStateNormal];    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithCustomView:ringhtButton];    // 对应实现方法:    - (void)leftButtonAction:(UIBarButtonSystemItem)button{        NSLog(@"1");    }    - (void)rightButtonAction:(UIBarButtonSystemItem)button{        NSLog(@"2");    }// 6.导航控制器控制页面跳转 (自带返回)    // ①创建一个跳转按钮     UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];    button.frame = CGRectMake(200, 100, 100, 40);    [button setTitle:@"下一页" forState:UIControlStateNormal];    [self.view addSubview:button];    button.layer.borderWidth = 1;    button.layer.cornerRadius = 10;    [button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];  // ②跳转方法   - (void)click:(UIButton *)button{     // 先创建下一页对象    SecondViewController *secVC = [[SecondViewController alloc]init];    // 跳转    [self.navigationController pushViewController:secVC animated:YES];    // 释放    [secVC release]; }

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界面传值 : 前向后

// ①在后一个界面的.h文件里设置属性 (SecondViewController.h)  // 传数值  @property(nonatomic, assign)NSInteger number;  // 传字符串  @property(nonatomic, copy)NSString *str;  // 传数组 @property(nonatomic,copy)NSArray *arr;// ②传值  //在第一个界面的跳转方法内写 (因为只有跳转的方法内会创建第二个页面的对象)      secVC.number = 100; // 传数值      secVC.str = self.myTextField.text; // 传字符 : 不要忘记建一个textfield      secVC.arr = @[@"杨林", @"刘珊珊"]; //传数组 

界面传值 : 后向前 需要写协议
例:
点击button, 将textfield里输入的内容传到第一个界面的label里

–SecondViewController.m文件–

#import <UIKit/UIKit.h>// 第一步 :  声明一份协议@protocol SecondViewControllerDelegate <NSObject>   // 协议方法    - (void)changeValue:(NSString *)value;@end@interface SecondViewController : UIViewController// 第二步 :  设置代理人属性@property(nonatomic, assign)id<SecondViewControllerDelegate>delegate;@end

–SecondViewController.m文件–

#import "SecondViewController.h"@interface SecondViewController ()// 一个textfiel, 一个button@property(nonatomic, retain)UITextField *textfield;@property(nonatomic, retain)UIButton *button;@end@implementation SecondViewController- (void)dealloc{    [_textfield release];    [_button release];    [super dealloc];}- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.    self.view.backgroundColor = [UIColor grayColor];    self.title = @"第二页";    self.textfield = [[UITextField alloc]initWithFrame:CGRectMake(100, 100, 100, 40)];    self.textfield.layer.borderWidth = 1;    self.textfield.layer.cornerRadius = 10;    [self.view addSubview:self.textfield];    [_textfield release];    self.button = [UIButton buttonWithType:UIButtonTypeCustom];    self.button.frame = CGRectMake(100, 200, 150, 40);    [self.button setTitle:@"返回" forState:UIControlStateNormal];    self.button.backgroundColor = [UIColor redColor];    [self.view addSubview:self.button];    self.button.layer.borderWidth = 1;    self.button.layer.cornerRadius = 10;    [self.button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];}// 点击返回//  协议的触发条件是点击按钮, 所以在这里面进行协议传值的第三步//  3.设置代理人执行的协议方法- (void)click:(UIButton *)button{    [self.navigationController popToRootViewControllerAnimated:YES];    [self.delegate changeValue:self.textfield.text];}

–MainViewController.m文件–

#import "MainViewController.h"#import "SecondViewController.h"//  第四步 :  签订协议@interface MainViewController ()<SecondViewControllerDelegate>@property(nonatomic, retain)UILabel *label;@property(nonatomic, retain)UIButton *button;@end@implementation MainViewController- (void)dealloc{    [_label release];    [super dealloc];}- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.    self.view.backgroundColor = [UIColor orangeColor];    //设置不透明    self.navigationController.navigationBar.translucent = NO;    self.title = @"第一页";    self.label = [[UILabel alloc]initWithFrame:CGRectMake(100, 100, 100, 40)];    self.label.layer.borderWidth = 1;    [self.view addSubview:self.label];    [_label release];    self.button = [UIButton buttonWithType:UIButtonTypeCustom];    self.button.frame = CGRectMake(100, 200, 150, 40);    [self.button setTitle:@"下一页" forState:UIControlStateNormal];    self.button.backgroundColor = [UIColor redColor];    [self.view addSubview:self.button];    self.button.layer.borderWidth = 1;    self.button.layer.cornerRadius = 10;    [self.button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];}- (void)click:(UIButton *)button{// push下一页    SecondViewController *secVC = [[SecondViewController alloc]init];    [self.navigationController pushViewController:secVC animated:YES];    [secVC release];//  第五步  :  设置代理人    secVC.delegate  =  self;}//  第六步  :  实现协议方法- (void)changeValue:(NSString *)value{    NSLog(@"%@",  value);    self.label.text = value;}