将数据传递给根视图控制器

Question

我有一个简单的应用程序，具有以下结构：

• ＆＃39; A＆＃39;：带有WebView的独立视图控制器
• ＆＃39; B＆＃39;：导航控制器
• ＆＃39; C＆＃39;：根视图控制器＆＃39; B＆＃39;，所有商店的TableView

当WebView的网址在＆＃39; A＆＃39;变成特定的东西（http://www.mysite.com/store），我需要：

1. 按下＆＃39; C＆＃39;
2. 发送要在＆＃39; C＆＃39;
中使用的字符串

我怎样才能做到这一点？

Answer 1

Here you can do with delegate methods   

  

//这是你的根ViewController来调用委托方法

#import "ThirdViewController.h"
#import "SecondViewController.h"
 @interface ViewController ()<ThirdViewControllerDelegate>
  @end

@implementation ViewController
 #pragma mark -
 #pragma mark ThirdViewController Delegate Method

  

//在Root ViewController中实现委托方法

-(void)didSelectValue:(NSString *)value{
    NSLog(@"%@",value);
}

// Pass the last Vc delegate to the next ViewController

-(void)gotoSeconddVc{
    SecondViewController *vc2=[[SecondViewController alloc]init];
    vc2.lastDelegate=self;
    [self.navigationController pushViewController:vc2 animated:YES];
}


 #import "ThirdViewController.h"
     @interface SecondViewController : UIViewController
        @property(nonatomic,retain) id <ThirdViewControllerDelegate> lastDelegate;
        @end

-(void)gotoThirdVc{
    ThirdViewController *vc3=[[ThirdViewController alloc]init];
    vc3.delegate=self.lastDelegate;
    [self.navigationController pushViewController:vc3 animated:YES];
}

  

最后一个viewcontroller的实现

@implementation ThirdViewController


-(void)btnDoneClicked{
    [self.navigationController popToRootViewControllerAnimated:YES];
    [self.delegate didSelectValue:strValue]; //call delegate methods here
}