//

//  AppDelegate.m

//  UI5_UINavigation传值

//

//  Created by zhangxueming on 15/7/7.

//  Copyright (c) 2015年 zhangxueming. All rights reserved.

//

#import "AppDelegate.h"

#import "ViewController.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

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

    // Override point for customization after application launch.

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

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

    self.window.rootViewController  = nav;

    return YES;

}

//

//  ViewController.h

//  UI5_UINavigation传值

//

//  Created by zhangxueming on 15/7/7.

//  Copyright (c) 2015年 zhangxueming. All rights reserved.

//

#import <UIKit/UIKit.h>

#import "SubViewController.h"

@interface ViewController : UIViewController <sendTitleReport>

@end

//

//  ViewController.m

//  UI5_UINavigation传值

//

//  Created by zhangxueming on 15/7/7.

//  Copyright (c) 2015年 zhangxueming. All rights reserved.

//

#import "ViewController.h"

#import "SubViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    self.view.backgroundColor = [UIColor cyanColor];

    UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];

    btn.frame = CGRectMake(100, 200, self.view.frame.size.width-200, 50);

    [btn setTitle:@"push" forState:UIControlStateNormal];

    btn.titleLabel.font = [UIFont boldSystemFontOfSize:24];

    [btn addTarget:self action:@selector(btnClicked) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:btn];

    self.navigationItem.title = @"按钮一";

}

- (void)btnClicked

{

    NSLog(@"-------");

    SubViewController *svc = [[SubViewController alloc] init];

    //正向传值: 最简单的做法, 在子视图控制器中定义属性实例变量接受值

    svc.delegate = self;//设置代理

    svc.currentTitle = self.navigationItem.title;

    [self.navigationController pushViewController:svc animated:YES];

}

- (void)sendButtonTitle:(NSString *)title

{

    self.navigationItem.title = title;

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end

//

//  SubViewController.h

//  UI5_UINavigation传值

//

//  Created by zhangxueming on 15/7/7.

//  Copyright (c) 2015年 zhangxueming. All rights reserved.

//

#import <UIKit/UIKit.h>

@protocol sendTitleReport <NSObject>

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

@end

@interface SubViewController : UIViewController

//记录当前被选中按钮的标题

@property (nonatomic, copy)NSString *currentTitle;

//防止相互引用

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

@end

//

//  SubViewController.m

//  UI5_UINavigation传值

//

//  Created by zhangxueming on 15/7/7.

//  Copyright (c) 2015年 zhangxueming. All rights reserved.

//

#import "SubViewController.h"

@interface SubViewController ()

@end

@implementation SubViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view.

    self.view.backgroundColor = [UIColor yellowColor];

    NSArray *titles = @[@"按钮一",@"按钮二",@"按钮三"];

    for (int i= 0; i<3; i++) {

        UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];

        btn.frame = CGRectMake(100, 100+i*100, self.view.frame.size.width-200, 50);

        [btn setTitle:titles[i] forState:UIControlStateNormal];

        btn.titleLabel.font = [UIFont boldSystemFontOfSize:24];

        [btn addTarget:self action:@selector(btnClicked:) forControlEvents:UIControlEventTouchUpInside];

        btn.tag = 200+i;

        //设置选中状态

        if ([self.currentTitle isEqualToString:btn.currentTitle]) {

            btn.selected   = YES;

        }

        [self.view addSubview:btn];

    }

}

- (void)btnClicked:(UIButton *)btn

{

    if([self.delegate respondsToSelector:@selector(sendButtonTitle:)])

    {

        [self.delegate sendButtonTitle:btn.currentTitle];

    }

    [self.navigationController popViewControllerAnimated:YES];

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

/*

#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    // Get the new view controller using [segue destinationViewController].

    // Pass the selected object to the new view controller.

}

*/

@end