我使用NavigationController從應用程序的rootView中「推送」viewControllers。Delegate和NavigationController的問題
我想使用委託來交流當前加載的視圖和rootViewController。我能夠使用NSNotificationCenter來做到這一點,但是想要爲這種特殊情況進行嘗試,因爲通信總是一對一的。
在該被推視圖,我聲明在頭文件下列代表protocole:
#import <UIKit/UIKit.h>
@protocol AnotherViewControllerDelegate;
@interface AnotherViewController : UIViewController {
id <AnotherViewControllerDelegate> delegate;
}
- (IBAction) doAction;
@property (nonatomic, assign) id delegate;
@end
@protocol AnotherViewControllerDelegate <NSObject>
- (void) doDelegatedAction:(AnotherViewController *)controller;
@end
的doAction IBAction爲被連接到一個UIButton在視圖中。我在執行文件,我說:
#import "AnotherViewController.h"
@implementation AnotherViewController
@synthesize delegate;
- (IBAction) doAction {
NSLog(@"doAction");
[self.delegate doDelegatedAction:self];
}
在我RootViewController.h我加AnotherViewControllerDelegate的接口聲明:
@interface RootViewController : UIViewController <AnotherViewControllerDelegate> {...
,這對我的實現文件
- (void) doDelegatedAction:(AnotherViewController *)controller {
NSLog(@"rootviewcontroller->doDelegatedAction");
}
不幸的是它不工作。未調用rootViewController中的doDelegatedAction。我懷疑這是因爲我的方式推AnotherViewController:
AnotherViewController *detailViewController = [[AnotherViewController alloc] initWithNibName:@"AnotherViewController" bundle:nil];
[self.navigationController pushViewController:detailViewController animated:YES];
[detailViewController release];
我應該告訴,以任何方式,以AnotherViewController其委託將是RootViewController的只是在那一刻,它已經被推?還是我缺少別的東西?
你在哪裏賦值的`delegate`?你必須告訴`AnotherViewController`的實例,`RootViewController`的哪個實例是它的委託。 – 2011-02-03 18:06:39