iOS基本控制－UINavigationController 传统的价值观，代理传统价值观，正向传统价值观，反传统的价值观

/*

 

 

 

 程序过程：

 1。创建一个根视图，一个二级视图

 2，根视图NavigationItem.title = Root 二级视图NavigationItem.title
= Second

 根视图NavigationItem.rightButton入栈二级视图

 3,
二级视图中创建三个buttonbutton一 button二 button三
三个button点击时间都是出栈。并把自己的button的

 titel 赋给根视图的NavigationItem.title

 4。当再次进入二级视图时，推断根视图的NavigationItem.title和哪个button的title一样。假设

 一样。就把button的title颜色设置为红色。

                **总结

     1，从第一层向第二层正向传參时：

          在第二层页面中创建一个接收这个參数的属性

          在第一层向第二层跳转时 创建完第二层的实例对象，

 */

<SendValue.h>

#import
<Foundation/Foundation.h>



@protocol
SendValue <NSObject]]>

- (void)sendBtnTitle:(NSString*)title;

@end

<XSAppDelegate.m>

#import
"XSAppDelegate.h"

#import "XSRootViewController.h"

@implementation XSAppDelegate



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

{

    self.window= [[UIWindowalloc]initWithFrame:[[UIScreenmainScreen]bounds]];

    // Override point for customization after application launch.

    self.window.backgroundColor=
[UIColorwhiteColor];

   

  



    XSRootViewController*rootViewController = [[XSRootViewControlleralloc]init];

   

    UINavigationController*navController = [[UINavigationControlleralloc]initWithRootViewController:rootViewController];

   

    self.window.rootViewController=
navController;

    [self.windowmakeKeyAndVisible];

    return
YES;

}

<XSRootViewController.m>

#import
"XSRootViewController.h"

#import "XSSecondViewController.h"

@interface XSRootViewController()



@end



@implementationXSRootViewController



- (id)initWithNibName:(NSString*)nibNameOrNil bundle:(NSBundle*)nibBundleOrNil

{

    self
= [super
initWithNibName:nibNameOrNil
bundle:nibBundleOrNil];

    if
(self) {

        // Custom initialization

    }

    return
self;

}



- (void)viewDidLoad

{

    [super
viewDidLoad];

// Do any additional setup after loading the view.

    self.view.backgroundColor=
[UIColoryellowColor];

    self.navigationItem.title=
@"Root";

   

    UIBarButtonItem*btnItem = [[UIBarButtonItemalloc]initWithTitle:@"Push"style:UIBarButtonItemStylePlaintarget:selfaction:@selector(btnClick:)];

    self.navigationItem.rightBarButtonItem=
btnItem;

}



//#pragma  mark --SendVaule

- (void)sendBtnTitle:(NSString*)title

{

    self.navigationItem.title=
title;

}



- (void)btnClick:(UIBarButtonItem*)btnItem

{

    XSSecondViewController*secondViewController = [[XSSecondViewControlleralloc]init];

    secondViewController.delegate=
self;

    secondViewController.currentTitle=
self.navigationItem.title;

    [self.navigationControllerpushViewController:secondViewControlleranimated:YES];

}

<XSSecondViewController.h>

#import
<UIKit/UIKit.h>

#import "SendValue.h"



@interface
XSSecondViewController : UIViewController

//定义代理

@property
(nonatomic,assign)id<SendValue>
delegate;

//创建一个正向传值的属性，

@property
(nonatomic,copy)NSString*currentTitle;

@end

<XSSecondViewController.m>

#import
"XSSecondViewController.h"

#import "XSRootViewController.h"

@interface XSSecondViewController()



@end



@implementationXSSecondViewController



- (id)initWithNibName:(NSString*)nibNameOrNil bundle:(NSBundle*)nibBundleOrNil

{

    self
= [super
initWithNibName:nibNameOrNil
bundle:nibBundleOrNil];

    if
(self) {

        // Custom initialization

    }

    return
self;

}



- (void)viewDidLoad

{

    [super
viewDidLoad];

// Do any additional setup after loading the view.

   

    UIBarButtonItem*btnItem = [[UIBarButtonItemalloc]initWithTitle:@"Pop"style:UIBarButtonItemStylePlaintarget:selfaction:@selector(btnClick)];

    self.navigationItem.leftBarButtonItem=
btnItem;

    self.view.backgroundColor=
[UIColorblueColor];

   

    UIButton*btn1 = [UIButtonbuttonWithType:UIButtonTypeSystem];

    btn1.frame=
CGRectMake(10, 80, 300, 40);

    [btn1 setTitle:@"按键一"forState:UIControlStateNormal];

    [btn1 setBackgroundColor:[UIColorwhiteColor]];

    [btn1 addTarget:selfaction:@selector(btnClick:)forControlEvents:UIControlEventTouchUpInside];

    btn1.tag= 1;

    //假设button的标题和属性中的_currentTitle同样，即和根页面中的导航条的title一样

    if
([_currentTitleisEqualToString:btn1.currentTitle])
{

        btn1.selected=
YES;

    }

    //假设selected为YES就运行setTitleColor

    [btn1 setTitleColor:[UIColorredColor]forState:UIControlStateSelected];

    [self.viewaddSubview:btn1];

   

   

    UIButton*btn2 = [UIButtonbuttonWithType:UIButtonTypeSystem];

    btn2.frame=
CGRectMake(10, 130, 300, 40);

    [btn2 setTitle:@"按键二"forState:UIControlStateNormal];

    [btn2 setBackgroundColor:[UIColorwhiteColor]];

    [btn2 addTarget:selfaction:@selector(btnClick:)forControlEvents:UIControlEventTouchUpInside];

    btn2.tag= 2;

    //假设button的标题和属性中的_currentTitle同样，即和根页面中的导航条的title一样

    if
([_currentTitleisEqualToString:btn2.currentTitle])
{

        btn2.selected=
YES;

    }

    //假设selected为YES就运行setTitleColor

    [btn2 setTitleColor:[UIColorredColor]forState:UIControlStateSelected];

    [self.viewaddSubview:btn2];

   

   

    UIButton*btn3 = [UIButtonbuttonWithType:UIButtonTypeSystem];

    btn3.frame=
CGRectMake(10, 180, 300, 40);

    [btn3 setTitle:@"按键三"forState:UIControlStateNormal];

    [btn3 setBackgroundColor:[UIColorwhiteColor]];

    [btn3 addTarget:selfaction:@selector(btnClick:)forControlEvents:UIControlEventTouchUpInside];

    btn3.tag= 3;

    //假设button的标题和属性中的_currentTitle同样，即和根页面中的导航条的title一样

    if
([_currentTitleisEqualToString:btn3.currentTitle])
{

        btn3.selected=
YES;

    }

    //假设selected为YES就运行setTitleColor

    [btn3 setTitleColor:[UIColorredColor]forState:UIControlStateSelected];

    [self.viewaddSubview:btn3];

   

}



- (void)btnClick

{

    [self.navigationControllerpopToRootViewControllerAnimated:YES];

}



- (void)btnClick:(UIButton*)btn

{

    //取出button的标题

    NSString*title =  btn.currentTitle;

    //推断代理中是否有sendBtnTitle：这个函数

    if
([_delegate
respondsToSelector:@selector(sendBtnTitle:)]) {

        //代理运行自己的sendBtnTitle函数，传參是title

        [_delegatesendBtnTitle:title];

    }

    [self.navigationControllerpopToRootViewControllerAnimated:YES];

}

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