來自protocole的方法中的代碼未被執行

Question

我是ios開發中的新成員，我正在使用2視圖控制器創建應用程序。我使用協議和委託從一個控制器發送數據到預覽控制器。數據通過罰款。我的問題是，在控制器中獲取數據的協議方法中的代碼是不執行的。該方法中的NSLOG是執行的，但其餘的gode no。 任何想法爲什麼發生這種情況？從控制器

代碼誰發送的數據：

.H

@class GeoCoding_controller; 

@protocol GeoContDelegate <NSObject> 

-(void)addItemViewController:(GeoCoding_controller *)controller didFinishEnteringItem:  (NSString *)item; 
@end 

.M

NSString *itemToPassBack = [NSString stringWithFormat:@"%@,%@,%@",final_loc[indexPath.row][@"form_address"],final_loc[indexPath.row][@"lat"],final_loc[indexPath.row][@"lng"]];; 

    First_view_controller *first_cont = [self .storyboard instantiateViewControllerWithIdentifier:@"first_view"]; 

[self presentViewController:first_cont animated:YES completion:nil]; 

[self.delegate addItemViewController:self didFinishEnteringItem:itemToPassBack]; 

守則控制器誰得到的數據：

.H

@interface First_view_controller : UIViewController<CLLocationManagerDelegate,GMSMapViewDelegate,GeoContDelegate> 

.M

-(void)addItemViewController:(GeoCoding_controller *)controller didFinishEnteringItem:(NSString *)item{ 


double delay = 10.0; 

dispatch_time_t poptime = dispatch_time(DISPATCH_TIME_NOW, delay * NSEC_PER_SEC); 

dispatch_after(poptime, dispatch_get_main_queue(), ^{ 


     NSArray *foo = [item componentsSeparatedByString:@","]; 

     NSString *address = [NSString stringWithFormat:@"%@ %@ %@",[foo objectAtIndex:0],[foo objectAtIndex:1],[foo objectAtIndex:2]]; 

     double lat = [[foo objectAtIndex:3]doubleValue]; 

     double lng =[[foo objectAtIndex:4] doubleValue]; 


     GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:lat longitude:lng zoom:18]; 

     MAP.camera = camera; 

     edtaddress.text = address; 



     NSLog(@"data from controller : %@", item); 

    }); 

}

Answer 1

你沒有爲自己的代表，你應該做的：

self.delegate = first_cont; 

後

First_view_controller *first_cont = [self .storyboard instantiateViewControllerWithIdentifier:@"first_view"];