第二次Xcode没有调用ViewDidLoad

Question

我有一个tableViewController,我从中导航到UIViewController.为了保存indexPath.row的值,我使用了一个整数,并基于该整数操作在UIViewController中执行.问题是,当我按下后退按钮并选择另一个表索引时,它会导航到UIViewContoller,但执行的操作是第一个.第二次不调用ViewDidLoad.这是我的代码.

TableView代码:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (!self.iaRecipieViewController) {
        self.iaRecipieViewController = [[[iRecipieViewController alloc] initWithNibName:@"iRecipieViewController" bundle:nil] autorelease];
    }
    if (indexPath.row == 0) {
        self.iaRecipieViewController.myLableArray =labelSoupArray ;
    }

    if (indexPath.row == 1) {
        self.iaRecipieViewController.myLableArray =labelSoupArray ;
    }

    if (indexPath.row == 2) {
        self.iaRecipieViewController.myLableArray =labelSoupArray ;
    }
    // custom string is an NSinteger
    self.iaRecipieViewController.customString = indexPath.row;
    NSLog(@"  int  %i",self.iaRecipieViewController.customString);
    NSLog(@"index path %i ", indexPath.row) ;

    [self.navigationController pushViewController:iaRecipieViewController animated:YES];

    [detailTable reloadData];
}

UIViewController代码.

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.

    myLabel.text = [self.myLableArray objectAtIndex:customString];
}

Answer 1

使用 viewWillAppear:(BOOL)animated

-(void)viewWillAppear:(BOOL)animated {

  [super viewWillAppear:animated];
  myLabel.text = [self.myLableArray objectAtIndex:customString];

}

只有在加载视图时才会调用viewDidLoad; 推送一个新的ViewController然后删除它不会强制重新加载视图.viewWillAppear在呈现视图之前被调用,因此您有机会在它成为主视图时执行操作.