从弹出表视图返回 NSDictionary 数据

Question

当我单击 ViewController1 上的按钮时，会出现一个弹出表格视图 (ViewController2)。然后，当我在表中选择一行时，我希望将这些值发送回 ViewController1。我设置了 NSDictionary。它在常规导航控制器中工作得很好，但尝试使用missModalViewControllerAnimated 来做到这一点，因此表视图会下降，并且数据会出现在第一个视图中。

我认为这与这里的问题类似： http ://www.iphonedevsdk.com/forum/iphone-sdk-development/39995-return-data-dismissmodalviewcontrolleranimated.html

这是我的代码：

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 ViewController2 代码中，您将创建一个新的 ViewController1 对象并为其提供 NSDictionary。当您关闭 ViewController2 时，您将返回到原始 ViewController1，它从未去任何地方，也从未发送给 NSDictionary。您需要为 ViewController2 提供对呈现它的 ViewController1 对象的访问权限（我建议通过委托模式执行此操作），以便在那里设置 NSDictionary 。