iOS基础控件－UINavigationController 中的传值，代理传值，正向传值，反向传值

浏览数：54 / 时间：2015年06月11日

/*

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按钮按钮一按钮二按钮三三个按钮点击时间都是出栈，并把自己的按钮的
titel 赋给根视图的NavigationItem.title
4，当再次进入二级视图时，判断根视图的NavigationItem.title 和哪个按钮的title一样，如果
一样，就把按钮的title颜色设置为红色。

**总结

1，从第一层向第二层正向传参时：

在第二层页面中创建一个接收这个参数的属性

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 = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor whiteColor];



    XSRootViewController *rootViewController = [[XSRootViewController alloc] init];

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

    self.window.rootViewController = navController;
    [self.window makeKeyAndVisible];
    return YES;
}

<XSRootViewController.m>

#import "XSRootViewController.h"
#import "XSSecondViewController.h"
@interface XSRootViewController ()

@end

@implementation XSRootViewController

- (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 = [UIColor yellowColor];
    self.navigationItem.title = @"Root";

    UIBarButtonItem *btnItem = [[UIBarButtonItem alloc] initWithTitle:@"Push" style:UIBarButtonItemStylePlain target:self action:@selector(btnClick:)];
    self.navigationItem.rightBarButtonItem = btnItem;
}

//#pragma mark --SendVaule
- (void)sendBtnTitle:(NSString *)title
{
    self.navigationItem.title = title;
}

- (void)btnClick:(UIBarButtonItem *)btnItem
{
    XSSecondViewController *secondViewController = [[XSSecondViewController alloc] init];
    secondViewController.delegate = self;
    secondViewController.currentTitle = self.navigationItem.title;
    [self.navigationController pushViewController:secondViewController animated: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

@implementation XSSecondViewController

- (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 = [[UIBarButtonItem alloc] initWithTitle:@"Pop" style:UIBarButtonItemStylePlain target:self action:@selector(btnClick)];
    self.navigationItem.leftBarButtonItem = btnItem;
    self.view.backgroundColor = [UIColor blueColor];

    UIButton *btn1 = [UIButton buttonWithType:UIButtonTypeSystem];
    btn1.frame = CGRectMake(10, 80, 300, 40);
    [btn1 setTitle:@"按键一" forState:UIControlStateNormal];
    [btn1 setBackgroundColor:[UIColor whiteColor]];
    [btn1 addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
    btn1.tag = 1;
    //如果按钮的标题和属性中的_currentTitle相同，即和根页面中的导航条的title一样
    if ([_currentTitle isEqualToString:btn1.currentTitle]) {
        btn1.selected = YES;
    }
    //如果selected为YES 就执行setTitleColor
    [btn1 setTitleColor:[UIColor redColor] forState:UIControlStateSelected];
    [self.view addSubview:btn1];


    UIButton *btn2 = [UIButton buttonWithType:UIButtonTypeSystem];
    btn2.frame = CGRectMake(10, 130, 300, 40);
    [btn2 setTitle:@"按键二" forState:UIControlStateNormal];
    [btn2 setBackgroundColor:[UIColor whiteColor]];
    [btn2 addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
    btn2.tag = 2;
    //如果按钮的标题和属性中的_currentTitle相同，即和根页面中的导航条的title一样
    if ([_currentTitle isEqualToString:btn2.currentTitle]) {
        btn2.selected = YES;
    }
    //如果selected为YES 就执行setTitleColor
    [btn2 setTitleColor:[UIColor redColor] forState:UIControlStateSelected];
    [self.view addSubview:btn2];


    UIButton *btn3 = [UIButton buttonWithType:UIButtonTypeSystem];
    btn3.frame = CGRectMake(10, 180, 300, 40);
    [btn3 setTitle:@"按键三" forState:UIControlStateNormal];
    [btn3 setBackgroundColor:[UIColor whiteColor]];
    [btn3 addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
    btn3.tag = 3;
    //如果按钮的标题和属性中的_currentTitle相同，即和根页面中的导航条的title一样
    if ([_currentTitle isEqualToString:btn3.currentTitle]) {
        btn3.selected = YES;
    }
    //如果selected为YES 就执行setTitleColor
    [btn3 setTitleColor:[UIColor redColor] forState:UIControlStateSelected];
    [self.view addSubview:btn3];

}

- (void)btnClick
{
    [self.navigationController popToRootViewControllerAnimated:YES];
}

- (void)btnClick:(UIButton *)btn
{
    //取出按钮的标题
    NSString *title = btn.currentTitle;
    //判断代理中是否有sendBtnTitle：这个函数
    if ([_delegate respondsToSelector:@selector(sendBtnTitle:)]) {
        //代理执行自己的sendBtnTitle 函数，传参是title
        [_delegate sendBtnTitle:title];
    }
    [self.navigationController popToRootViewControllerAnimated:YES];
}

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iOS基础控件－UINavigationController 中的传值，代理传值，正向传值，反向传值