iphone - 将 NSString 发送到另一个 UIViewController 给出 null

Question

很简单，但我真的不知道为什么它总是给我null。

- FirstViewcontroller:

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

    [_tableView deselectRowAtIndexPath:indexPath animated:YES];

        SubViewViewController *viewTwo = [[SubViewViewController alloc] initWithNibName:@"SubViewViewController" bundle:[NSBundle mainBundle]];


    viewTwo.queryValue = [NSString stringWithFormat:@"%d",indexPath.row];

    [self.navigationController pushViewController:self.subViewController animated:YES];
}

- SecondViewcontroller.h:

NSString             *queryValue;
@property (nonatomic, retain) NSString *queryValue;

- SecondViewcontroller.m:

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSLog(@"%@", self.queryValue);
}

Answer 1

在你的代码中你做错了你应该初始化你推送到 navigationController 的 viewController，你正在初始化 viewTo 但你正在推送 self.subViewController。

应该是这样初始化的；

self.subViewController= [[SubViewViewController alloc] initWithNibName:@"SubViewViewController" bundle:[NSBundle mainBundle]];