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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