Question

我有一个 UIViewController ，它嵌入在导航控制器中并以模态方式呈现：

//UIViewController
AuthenticationController *auth = [[AuthenticationController alloc] init];

//UINavigationController
AuthRootController *navController = [[AuthRootController alloc]
                                         initWithRootViewController:auth];

navController.navigationBar.topItem.title = @"Anmelden";
navController.delegate = self;

[self presentModalViewController:navController animated:YES];
RELEASE_SAFELY(navController);

但是我在AuthRootController类中创建的委托有问题：

@protocol AuthRootControllerDelegate

@required
-(void)authRootControllerDidEnd:(UINavigationController *)sender;

@end

@interface AuthRootController : UINavigationController {
    id<AuthRootControllerDelegate>  delegate;
}

@property (nonatomic, assign) IBOutlet id delegate;

@end

实施：

@implementation AuthRootController
@synthesize delegate;

-(void)userDidCancelController:(UINavigationController *)sender{
    if (self.delegate && [self.delegate conformsToProtocol:@protocol(AuthRootControllerDelegate)]) {
        [self.delegate authRootControllerDidEnd:sender];
    }
}

@end

当我使用方法时

-(void)authRootControllerDidEnd:(UINavigationController *)sender

它没有被触发。有什么想法吗？

Answer 1

您是否声明您的委托符合AuthRootControllerDelegate？ conformsToProtocol测试查看委托是否声明一致性，它不进行任何类型的逐个方法检查。因此，即使您在委托上实现了authRootControllerDidEnd：，conformsToProtocol仍然可以返回NO。

Answer 2

在您的界面中，您没有声明它是实现委托协议，您需要修改您的接口声明，如下所示：

@interface AuthRootController : UINavigationController<AuthRootControllerDelegate> {

从委托中实现的方法未触发

2 个答案: