從彈出式表格中返回NSDictionary數據

Question

當我單擊ViewController1上的一個按鈕時，出現一個彈出式tableview（ViewController2）。然後，當我在表中選擇一行時，我希望這些值被髮送回ViewController1。我有一個NSDictionary設置。它在正常的導航控制器中工作正常，但嘗試使用dismissModalViewControllerAnimated執行此操作，因此tableview退回，數據出現在第一個視圖中。

這類似於這個問題在這裏，我想：http://www.iphonedevsdk.com/forum/iphone-sdk-development/39995-return-data-dismissmodalviewcontrolleranimated.html

這裏是我的代碼：

ViewController1.h：

@protocol ViewController1Delegate; 
@interface ViewController1 : UIViewController <ViewController2Delegate> { 
    id <ViewController1Delegate> delegate; 
} 
@property (nonatomic, assign) id <ViewController1Delegate> delegate; 
@end 
@protocol ViewController1Delegate 
- (void)viewController1DidFinish:(ViewController1 *)controller; 
@end 

ViewController1.m：

-(void)buttonGoToViewController2 { 
    ViewController2 *controller = [[ViewController2 alloc] initWithNibName:@"ViewController2" bundle:nil]; 

// this controller.delegate = self causes it to crash if i have it uncommented for some reason... 
// controller.delegate = self; 

    controller.modalTransitionStyle = UIModalTransitionStyleCoverVertical; 
    [self presentModalViewController:controller animated:YES]; 
    [controller release]; 
} 

ViewController2.m：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { 

    if(searching) { 
     // Navigation logic may go here. Create and push another view controller. 
     NSDictionary *selectedCountry = [self.copyListOfItems objectAtIndex:indexPath.row]; 
     ViewController1 *dvController = [[ViewController1 alloc] initWithNibName:@"ViewController1" bundle:nil andDictionary: selectedCountry]; 
     NSLog(@"selected hit this %@",selectedCountry); 
     // Pass the selected object to the new view controller. 
     [self.navigationController pushViewController:dvController animated:YES]; 
     [dvController release]; 
     [self dismissModalViewControllerAnimated:YES]; 

    } 
    else { 
     // Navigation logic may go here. Create and push another view controller. 
     NSDictionary *dictionary = [self.listOfItems objectAtIndex:indexPath.row]; 
     ViewController1 *dvController = [[ViewController1 alloc] initWithNibName:@"ViewController1" bundle:nil andDictionary: dictionary]; 
     NSLog(@"normal hit this %@",dictionary); 
     // Pass the selected object to the new view controller. 
     [self.navigationController pushViewController:dvController animated:YES]; 
     [dvController release];  
    } 
} 

Answer 1

在您的ViewController2代碼中，您正在創建一個新的ViewController1對象併爲其提供NSDictionary。當你關閉ViewController2時，你會回到原始的 ViewController1，它永遠不會去任何地方，並且永遠不會發送NSDictionary。您需要爲ViewController2提供對呈現它的ViewController1對象的訪問權限（我建議通過委託模式進行操作），以便在其中設置NSDictionary。