Question

在我的应用程序中，我有两种不同的方式来访问相同的UIViewController，在途中是通过使用故事板创建的2个父ViewControllers，这种方式完美地传递和id通过每个segue过渡。

另一种方式（这是我需要帮助的）直接来自RootViewController上按下的按钮，它也只是将id传递给一个名为Event的自定义对象。每个转换的代码如下：

来自segue：

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender 
{
    NSIndexPath *path = [self.tableView indexPathForSelectedRow];
    Event *event = [nEventList objectAtIndex:path.row];
    EventInfo *eventInfo = segue.destinationViewController; //Create new ViewController
    eventInfo.eventID = event.id;
}

从按钮

- (void)FeaturedPressedAction:(id)sender
{
    UIButton *button = (UIButton *)sender;
    int tag = button.tag;
    EventInfo *eventInfo = [[EventInfo alloc] init]; //Create new ViewController
    eventInfo.eventID = @"1"; //There is an event with id '1'
    [self.navigationController pushViewController:eventInfo animated:YES];
}

设置ViewController的代码：

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

    UIImage *image = [UIImage imageNamed:@"title.png"];
    self.navigationItem.titleView = [[UIImageView alloc] initWithImage:image];

    SingletonClass* myapp = [SingletonClass sharedInstance];
    events = [myapp getEvents];

    // Loop to filter out the events that Do not have this ID
    Event *event;
    BOOL found = false;
    for (int i = 0; i < [events count]; i++) {
        if(!found){
            event = [events objectAtIndex:i];
            if([event.id isEqualToString: eventID]){
                found = true;
                NSLog(@"Found the event with title %@", event.title);
            }
        }
    }

    self.eventTitle.text = event.title;
    self.eventLocation.text = event.location;
    self.eventDate.text = event.date;
    self.eventTime.text = @"22:00";
    self.eventDescription.text = event.details; 
}

它发现事件正常，因为我可以看到NSLog左边的那个，当按下按钮时没有任何视图加载。我哪里错了？

Answer 1

您应该从故事板中实例化它，而不是分配您的EventInfo*。

所以在FeaturedPressedAction中用以下内容替换初始化行：

EventInfo *eventInfo = [self.storyboard instantiateViewControllerWithIdentifier:@"..."];

确保使用相同的标识符识别Interface Builder中的ViewController。用有意义的东西替换......

相同的UIViewController从2个不同的源加载，但结果不同

1 个答案: