在具有參數的標準方法中使用addSubView或presentModalViewController？

Question

我想重用代碼，我有一些教程視圖控制器/視圖，我想從操作表調用。但是，調用視圖是不同的。有時，教程視圖將需要添加爲子視圖，有時它們將被添加到導航控制器。

如何擴展我的標準功能以迎合這兩種不同情況？

你可以看到我在做相反，這意味着重複的代碼:(

我有一個叫做類擁有標準的代碼，我想在這裏呼籲直接添加到的意見是什麼。

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

我在這樣一個視圖中使用...

- (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]; 
    } 
} 

，是這樣的另一種觀點認爲...

- (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

也許actionSheets可以共享一個相同的委託，它可以是根viewController或appDelegate，它可以根據它的當前狀態知道該怎麼做。因此，在這兩種情況下都會使用相同的actionSheet方法。

如果你把你的appDelegate始終作爲actionSheetDelegate到達，你應該能夠控制每一種方式來呈現你的視圖，無論是在你的視圖還是窗口中。

EDIT（與您的代碼重新編輯）：也許試試這個

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]; 
    } 
} 

，並在您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]; 
} 

沒有嘗試，但它應該工作。