ios - 将日期选择器日期传回 View Controller 以在标签中显示日期

Question

我已经研究了一堆关于如何做到这一点的问题，现在只是简短地提出来。

我有 ViewControllerA 和 ViewControllerB。

ViewControllerB 正在将 NSDate 从 UIDatePicker 传回 ViewControllerA。

我很好，直到尝试将 NSDate 作为标签放入它对应的 TableViewCell 中。

你能帮忙吗？谢谢!

ViewControllerA

- (void)addItemViewController:(EXEDurationPickerViewController *)controller didFinishEnteringItem:(NSString *)item {
    NSLog(@"This was returned from ViewControllerB %@", item);
}

item 是从 ViewControllerB 中选取的日期。如何让它在相应的 TableViewCell 中显示为标签？

Answer 1

使用delegate传递日期或其他选项发送Notificaition

在 ViewControllerA 中添加这个

@interface ViewControllerA : UIViewController{
    NSIndexPath *selectedIndexPath;
}
@end

-(void)viewDidLoad{

  [[NSNotificationCenter defaultCenter] addObserver:self
        selector:@selector(receiveNotification:) 
        name:@"dateSend"
        object:nil];
}

- (void) receiveNotification:(NSNotification *) notification
{
   NSString *item =  notification.userInfo[@"date"];

   // show for what cell you want to show
    //keep selectedIndexPath as instance Variable
    YourCell *cell = (YourCell *)[self.tableView cellForRowAtIndexPath:selectedIndexPath];
    cell.label.text = item;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    selectedIndexPath = indexPath;
}
//Post the notification fro `ViewControllerB`
- (void)addItemViewController:(EXEDurationPickerViewController *)controller didFinishEnteringItem:(NSString *)item {
    NSLog(@"This was returned from ViewControllerB %@", item);


    [[NSNotificationCenter defaultCenter] postNotificationName: @"TestNotification" object:nil userInfo:@{@"date":item}];
}