Iphone 当将数据从选定的tableview行传递到viewcontroller时，我对得到的结果感到困惑

为什么在DetailViewController中，NSLogs在viewDidLoad中分别返回标签和（null），而在iAction中，它们从所选行返回预期值？如何在viewDidLoad中获得正确的值

TableViewController

- (void)tableView:(UITableView *) tableView didSelectRowAtIndexPath:(NSIndexPath *__strong)indexPath {
    DetailViewController *detail = [self.storyboard instantiateViewControllerWithIdentifier:@"Detail"];
    [self.navigationController pushViewController:detail animated:YES];
    NSUInteger row = [indexPath row];
    detail.selected1.text = [array1 objectAtIndex:row];
    detail.selected2 = [array2 objectAtIndex:row];    }

-(void) viewDidLoad
{
    NSLog(@"Log: %@", selected1.text);
    NSLog(@"Log: %@", selected2);

}

- (IBAction) test:(id)sender
{
NSLog(@"Log: %@", selected1.text);
    NSLog(@"Log: %@", selected2);
}

详细视图控制器

- (void)tableView:(UITableView *) tableView didSelectRowAtIndexPath:(NSIndexPath *__strong)indexPath {
    DetailViewController *detail = [self.storyboard instantiateViewControllerWithIdentifier:@"Detail"];
    [self.navigationController pushViewController:detail animated:YES];
    NSUInteger row = [indexPath row];
    detail.selected1.text = [array1 objectAtIndex:row];
    detail.selected2 = [array2 objectAtIndex:row];    }

-(void) viewDidLoad
{
    NSLog(@"Log: %@", selected1.text);
    NSLog(@"Log: %@", selected2);

}

- (IBAction) test:(id)sender
{
NSLog(@"Log: %@", selected1.text);
    NSLog(@"Log: %@", selected2);
}

---

viewDidLoad在加载视图控制器（即InstanceEviewControllerWithiIdentifier:）后被调用。因此，在设置标签时，viewDidLoad已经运行并返回。尝试将日志语句放在ViewDidDisplay中