iPhone：從另一個類訪問NSString值

首先讓我爲我的壞英語道歉。所以我試圖做這個程序，從另一個類中獲取一個類的NSString的值。這裏的代碼：iPhone：從另一個類訪問NSString值

/---------------------/tableViewController.h ----------- 

#import <UIKit/UIKit.h> 
@class paisesDetailViewController; 

@interface tableViewController : UITableViewController <UITableViewDelegate, UITableViewDataSource>{ 
    IBOutlet UITableView *paisesTableView; 
    paisesDetailViewController *PaisesDetailViewController; 

    //DB 
    NSString *DBName; 
    NSString *DBPath; 
    NSMutableArray *ArrayPais; //means Countrys 
    NSString *escolha; //means choise 
} 

@property(nonatomic, retain) paisesDetailViewController *PaisesDetailViewController; 
@property(nonatomic, retain) NSMutableArray *ArrayPais; 
@property(nonatomic, retain) NSString *escolha; 

@end 




-----------------------------//tableViewController.m--------------- 

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    NSInteger row = [indexPath row]; 
    if(self.PaisesDetailViewController == nil) 
    { 
     paisesDetailViewController *apaisesDetail = [[paisesDetailViewController alloc] initWithNibName:@"paisesDetailView" bundle:nil]; 
     self.PaisesDetailViewController = apaisesDetail; 
     [apaisesDetail release]; 
    } 

    [tableView deselectRowAtIndexPath:indexPath animated:YES]; 

    escolha = [[NSString alloc] init]; 
    self.escolha = [NSString stringWithFormat:@"%@", [ArrayPais objectAtIndex:(row)]]; 

    paisesDetailViewController *nextview = [[paisesDetailViewController alloc] init]; 
    [self.navigationController pushViewController:nextview animated:YES]; 
    [nextview release]; 

} 




-----------------------------------//paisesDetailViewController.h------------ 
#import <UIKit/UIKit.h> 
#import "tableViewController.h" 
@class tableViewController; 

@interface paisesDetailViewController : UIViewController { 
    tableViewController *dados; 

} 

@property(nonatomic, retain) tableViewController *dados; 

@end 


//-----------------------paisesDetailViewController.m 
#import "paisesDetailViewController.h" 
#import "tableViewController.h" 

@implementation paisesDetailViewController 
@synthesize dados; 

-(IBAction) createEvent 
{ 
     NSString *help = [[NSString alloc] initWithString: dados.escolha]; 
}

問題是，'dados.escolha'總是零，我只是不明白爲什麼。感謝您的幫助。

來源

2011-06-24 JTFerreira

試試這個，

paisesDetailViewController *nextview = [[paisesDetailViewController alloc] init]; 
nextView.dados = self; 
[self.navigationController pushViewController:nextview animated:YES]; 
[nextview release];

UPDATE：

試試這個代碼：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    NSInteger row = [indexPath row]; 
    if(self.PaisesDetailViewController == nil) 
    { 
     paisesDetailViewController *apaisesDetail = [[paisesDetailViewController alloc] initWithNibName:@"paisesDetailView" bundle:nil]; 
     self.PaisesDetailViewController = apaisesDetail; 
     [apaisesDetail release]; 
    } 

    [tableView deselectRowAtIndexPath:indexPath animated:YES]; 

    escolha = [[NSString alloc] init]; 
    self.escolha = [NSString stringWithFormat:@"%@", [ArrayPais objectAtIndex:(row)]]; 

    paisesDetailViewController *nextview = [[paisesDetailViewController alloc] init]; 
    nextView.dados = self; 
    [self.navigationController pushViewController:nextview animated:YES]; 
    [nextview release]; 
}

來源

2011-06-24 16:43:12

這樣做了。謝謝。但要解決它，我不得不做* dados = [[tableViewController alloc] init];每當我做到這一點時，我總是得到零。現在它的工作，這就是metter :) Thks – JTFerreira

Superbbb Man ... it Worked ... nextView.dados = self;我正在尋找類似場景的解決方案，並最終解決上述問題。非常感謝... –

請確保您包括

@synthesize escolha;

在tableViewController.m

。另外，還要確保你分配和paisesDetailViewController.m

實例 dados

tableViewController *dados = [[tableViewController alloc] init];

然後嘗試使用簡單

-(IBAction) createEvent 
{ 
     NSString *help = dados.escolha; 
}

而且，你的大小寫約定是倒退。通常，類名是大寫的，而實例不是，例如MyObject *myObject。

來源

2011-06-24 16:45:35 PengOne

「tableViewController * dados = [[tableViewController alloc] init];」你不是說「dados = [[tableViewController alloc] init];」？通過做，因爲你說我正在創建一個新的「爸爸」... 無論如何，我一直得到零dados.escolha ... – JTFerreira

-(IBAction) createEvent 
{ 
    NSString *help = [[NSString alloc] init]; 

    help = [NSString stringWithFormat: @"%@", self.dados.escolha]; 

    NSLog(@"help is : %@ ", help); 

    // You have synthesized them, so use with self 
}

來源

2011-06-24 16:54:23

self.dados.escolha ==零，同樣的問題... – JTFerreira

iPhone：從另一個類訪問NSString值

回答

相關問題