我使用NavigationController从应用程序的rootView中“推送”viewControllers。Delegate和NavigationController的问题
我想使用委托来交流当前加载的视图和rootViewController。我能够使用NSNotificationCenter来做到这一点,但是想要为这种特殊情况进行尝试,因为通信总是一对一的。
在该被推视图,我声明在头文件下列代表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为被连接到一个UIButton在视图中。我在执行文件,我说:
#import "AnotherViewController.h"
@implementation AnotherViewController
@synthesize delegate;
- (IBAction) doAction {
NSLog(@"doAction");
[self.delegate doDelegatedAction:self];
}
在我RootViewController.h我加AnotherViewControllerDelegate的接口声明:
@interface RootViewController : UIViewController <AnotherViewControllerDelegate> {...
,这对我的实现文件
- (void) doDelegatedAction:(AnotherViewController *)controller {
NSLog(@"rootviewcontroller->doDelegatedAction");
}
不幸的是它不工作。未调用rootViewController中的doDelegatedAction。我怀疑这是因为我的方式推AnotherViewController:
AnotherViewController *detailViewController = [[AnotherViewController alloc] initWithNibName:@"AnotherViewController" bundle:nil];
[self.navigationController pushViewController:detailViewController animated:YES];
[detailViewController release];
我应该告诉,以任何方式,以AnotherViewController其委托将是RootViewController的只是在那一刻,它已经被推?还是我缺少别的东西?
你在哪里赋值的`delegate`?你必须告诉`AnotherViewController`的实例,`RootViewController`的哪个实例是它的委托。 – 2011-02-03 18:06:39