数据未被传递到视图控制器时推

Question

我有一个tableviewcontroller数据人口它。我试图在用户点击单元格时获得新的细节视图。我可以加载视图，但更详细显示数据的标签不会更新。以下是代码：

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

[tableView deselectRowAtIndexPath:indexPath animated:YES]; 

SearchDetailViewController *controller = [self.storyboard instantiateViewControllerWithIdentifier:@"searchDetailVC"]; 
Events *event = [events objectAtIndex:indexPath.row]; 

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; 
[dateFormatter setDateStyle:NSDateFormatterLongStyle]; 
NSString *dateString = [dateFormatter stringFromDate:event.eventDate]; 

controller.title=event.eventName; //ONLY ONE THAT WORKS! 


controller.eventName.text = event.eventName; 
controller.eventAddress.text = event.eventAddress; 
controller.eventDate.text = dateString; 
controller.eventTime.text = event.eventTime; 
controller.ratingView.image = [self imageForRating:event.eventRating]; 
controller.eventDistance.text = @"NOT YET IMPLEMENTED"; 

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

设置的唯一属性是NavigationController导航栏的标题。我在做什么大错特错？

Answer 1

你不能传递这样的数据。 ViewController.domainField当时为零，因为视图还没有加载，并且当视图加载时（通过笔尖）而不是视图控制器对象被创建时，标签/ TextField被创建。

此代码可以帮助您

SearchDetailViewController.h 
    #import <UIKit/UIKit.h> 
    @interface SearchDetailViewController : UIViewController 
    { 

     NSString* eventNameString ; 
     NSString* eventAddressString; 
     ........... 
     ............. 

    } 
    @property (nonatomic,retain) NSString* eventNameString ; 
    @property (nonatomic,retain) NSString* eventAddressString; 
    ............... 
    ............... 
    @end 


SearchDetailViewController.m 
- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    eventName.text=eventNameString; 
    eventAddress.text=eventAddressString; 
    .......................... 
    .......................... 
    eventNameString=[[NSString alloc]initWithString:@""]; 
} 


TableView.m 

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

[tableView deselectRowAtIndexPath:indexPath animated:YES]; 

SearchDetailViewController *controller = [self.storyboard instantiateViewControllerWithIdentifier:@"searchDetailVC"]; 
Events *event = [events objectAtIndex:indexPath.row]; 

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; 
[dateFormatter setDateStyle:NSDateFormatterLongStyle]; 
NSString *dateString = [dateFormatter stringFromDate:event.eventDate]; 

controller.title=event.eventName; //ONLY ONE THAT WORKS! 


controller.eventNameString=[[NSString alloc]initWithString:event.eventName]; 
controller.eventAddressString=[[NSString alloc]initWithString:eventAddress]; 
............................... 
............................... 
............ 

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

同样，你必须从一个视图传递所有数据，以另一种观点 - 你不能直接分配给控制器。