數據未被傳遞到視圖控制器時推

Question

我有一個tableviewcontroller數據人口它。我試圖在用戶點擊單元格時獲得新的細節視圖。我可以加載視圖，但更詳細顯示數據的標籤不會更新。以下是代碼：

- (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]; 
} 

設置的唯一屬性是NavigationController導航欄的標題。我在做什麼大錯特錯？

Answer 1

你不能傳遞這樣的數據。 ViewController.domainField當時爲零，因爲視圖還沒有加載，並且當視圖加載時（通過筆尖）而不是視圖控制器對象被創建時，標籤/ TextField被創建。

此代碼可以幫助您

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]; 
} 

同樣，你必須從一個視圖傳遞所有數據，以另一種觀點 - 你不能直接分配給控制器。