数据未被传递到视图控制器时推
问题描述:
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:数据未被传递到视图控制器时推
- (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?
答
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。
+0
谢谢,我已经实现了,但是当代码到达'[self.navigationController pushViewController:controller animated:YES];'我得到错误'***终止应用程序由于未捕获的异常'NSUnknownKeyException',原因:'[
是指向视图中元素的eventName,eventAddress等出口?看起来像在你推新控制器的时候视图没有被加载。也许将它们存储在视图控制器的实例变量中,然后在'viewDidLoad'中设置UI元素? – 2012-01-10 07:08:05