兩個view controller資料傳送呼叫顯示等

---------------------------------------------------------------------------

1 呼叫 2 出來

[self performSegueWithIdentifier:@"upload to location" sender:nil];

---------------------------------------------------------------------------

1 傳送data到 2

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

{

    id dv = segue.destinationViewController;

    [dv setValue:@"123,111" forKey:@"gps"];

}

---------------------------------------------------------------------------

---------------------------------------------------------------------------

2 返回 1 (不透過nav bar 的back button)

    UIViewController *prevVC = [self.navigationController.viewControllers objectAtIndex:1];//1 is level

    [self.navigationController popToViewController:prevVC animated:YES];

指定回去的leval，1就是leavl

---------------------------------------------------------------------------

2 傳送data回 1 (需要實作delegate)

step1 :(在page2的.h檔定義delegate)

//--delegate部分

@protocol page2Delegate <NSObject>

@optional

- (void)passValue:(NSString *)value;

@end

//--

//--

@property (nonatomic, weak) id<LocationDelegate> delegate;

//--

---------------------------------------------------------------------------

step2 : 在page1裡載入delegate

#import "page2.h"//實作協定用

@interface uploadViewController : UIViewController<page2Delegate>

並在page1.m檔裡面實作delegate 方法

- (void)passValue:(NSString *)value{
     //在這裡實作協定
}

---------------------------------------------------------------------------

strp3:在pag1呼叫page2時，指定自己是page2的delegate

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

{

    id dv = segue.destinationViewController;

    [dv setValue:self forKey:@"delegate"];

}

---------------------------------------------------------------------------

step4 :在page2適當的call method，讓delegate執行這個method

[self.delegate passValue:@"pass from 2 data string"];

////類似（  performSegueWithIdentifier ＋ prepareForSegue ）

    /*

    UIStoryboard *storybord = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];

    

    locationViewController *uploadView = [storybord instantiateViewControllerWithIdentifier:@"location"];

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

     */