在具有参数的标准方法中使用addSubView或presentModalViewController？

Question

我想重用代码，我有一些教程视图控制器/视图，我想从操作表调用。但是，调用视图是不同的。有时，教程视图将需要添加为子视图，有时它们将被添加到导航控制器。

如何扩展我的标准功能以迎合这两种不同情况？

你可以看到我在做相反，这意味着重复的代码:(

我有一个叫做类拥有标准的代码，我想在这里呼吁直接添加到的意见是什么。

-(void)showHelpClickButtonAtIndex:(int)buttonIndex:(UIView *)vw { 
if (buttonIndex == CommonUIHelpPagesBtnIdx) { 
    // do nothing 
} else if (buttonIndex == 0) { 
    NSLog(@"Tutorial here"); 
} 
} 

我在这样一个视图中使用...

- (void)actionSheet:(UIActionSheet *)actionSheet 
     clickedButtonAtIndex:(NSInteger)buttonIndex { 
CommonUI *cui = [CommonUI alloc]; 
[cui showHelpClickButtonAtIndex:buttonIndex:self.view]; 
[cui release]; 

if (buttonIndex == CommonUIHelpPagesBtnIdx) { 
    UIViewController *theController = [[HelpViewController alloc] 
     initWithNibName:@"HelpView" 
     bundle:nil onPage:HelpPageCalcBalance]; 
    [self.navigationController.topViewController 
     presentModalViewController:theController animated:YES]; 
    [theController release]; 
    } 
} 

，是这样的另一种观点认为...

- (void)actionSheet:(UIActionSheet *)actionSheet 
    clickedButtonAtIndex:(NSInteger)buttonIndex { 
    [cui showHelpClickButtonAtIndex:buttonIndex:self.view]; 

    if (buttonIndex == CommonUIHelpPagesBtnIdx) { 
     theController = [[HelpViewController alloc] initWithNibName:@"HelpView"      
     bundle:nil onPage:HelpPageGettingStarted]; 

     [self.view addSubview:theController.view]; 
    } 

} 

Answer 1

也许actionSheets可以共享一个相同的委托，它可以是根viewController或appDelegate，它可以根据它的当前状态知道该怎么做。因此，在这两种情况下都会使用相同的actionSheet方法。

如果你把你的appDelegate始终作为actionSheetDelegate到达，你应该能够控制每一种方式来呈现你的视图，无论是在你的视图还是窗口中。

EDIT（与您的代码重新编辑）：也许试试这个

MyAppDelegate.h：

@interface MyAppAppDelegate : NSObject <UIApplicationDelegate, UIActionSheetDelegate> 
(...) 

- (void) showHelp; 

MyAppDelegate.m：

- (void) showHelp { 
    UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@"" 
                  delegate:self 
                cancelButtonTitle:@"Cancel" 
               destructiveButtonTitle:nil 
                otherButtonTitles: @"Tutorial", @"Help Pages", nil]; 

    actionSheet.actionSheetStyle = UIActionSheetStyleBlackOpaque; 
    [actionSheet showInView:window]; 
    [actionSheet release]; 
} 

- (void)actionSheet:(UIActionSheet *)actionSheet 
clickedButtonAtIndex:(NSInteger)buttonIndex { 
    if (buttonIndex == CommonUIHelpPagesBtnIdx) { 
     UIViewController *theController = [HelpViewController alloc]; 
     if ([[self lvc] superview] != nil) { 
      theController = [initWithNibName:@"HelpView"      
             bundle:nil 
             onPage:HelpPageGettingStarted]; 
      [window addSubview:theController.view]; 
     } else { 
      theController = [initWithNibName:@"HelpView" 
             bundle:nil 
             onPage:HelpPageCalcBalance]; 
      UINavigationController * navController = [tabBarController selectedViewController]; 
      [navController.topViewController presentModalViewController:theController animated:YES]; 
     } 
     [theController release]; 
    } 
} 

，并在您viewControllers：

- (void)viewDidLoad { 
    [super viewDidLoad]; 
    MyAppDelegate *delegate = (MyAppDelegate *) [[UIApplication sharedApplication] delegate]; 

    UIButton *infoButton = [UIButton buttonWithType:UIButtonTypeInfoLight]; 
    [infoButton addTarget:delegate 
        action:@selector(showHelp) 
     forControlEvents:UIControlEventTouchUpInside]; 
    UIBarButtonItem *infoItem = [[UIBarButtonItem alloc] initWithCustomView:infoButton]; 
    self.navigationItem.rightBarButtonItem = infoItem; 
    [infoItem release]; 
} 

没有尝试，但它应该工作。