顯示菜單的方法：

1、showInView

2、showFromToolBar:和showFromTabBar

視圖控制類需要是現實協議接口UIActionSheetDelegate

@interface HelloController :UIViewController<UIActionSheetDelegate> 
@end 

主要實現代碼：

- (void)actionSheet:(UIActionSheet*)actionSheetclickedButtonAtIndex:(NSInteger)buttonIndex 
{ 
printf("User Pressed Button %d\n",buttonIndex + 1); 
[actionSheet release]; 
} 
- (void) presentSheet 
{ 
UIActionSheet *menu = [[UIActionSheetalloc] 
initWithTitle: @"FileManagement" 
delegate:self 
cancelButtonTitle:@"Cancel" 
destructiveButtonTitle:@"DeleteFile" 
otherButtonTitles:@"Rename File", @"EmailFile", nil]; 
[menu showInView:self.view]; 
} 

類學習

UIActionSheet類

繼承UIView

Use the UIActionSheet class to presentthe user with a set of alternatives for how to proceed with a giventask. You can also use action sheets to prompt the user to confirma potentially dangerous action. The action sheet contains anoptional title and one or more buttons, each of which correspondsto an action to take. 

使用UIActionSheet類呈現給用戶一系列交替選項用于決定如何處理所給的任務。你也可以使用動作表來提示用戶確認具有潛在危險的動作。動作表包含可選標題和1個或多個按鈕，每個按鈕對應響應所給的動作。

Creating Action Sheets

–initWithTitle:delegate:cancelButtonTitle:destructiveButtonTitle:otherButtonTitles: 

Setting Properties

delegate  property 
title  property 
visible  property 
actionSheetStyle property 

Configuring Buttons

–addButtonWithTitle: 
numberOfButtons property 
–buttonTitleAtIndex: 
cancelButtonIndex property 
destructiveButtonIndex property 
firstOtherButtonIndex property 

Presenting the Action Sheet

–showFromTabBar: 
–showFromToolbar: 
–showInView: 
–showFromBarButtonItem:animated: 
–showFromRect:inView:animated: 

Dismissing the Action Sheet

–dismissWithClickedButtonIndex:animated: 

備注：比對學習下UIAlertView，你會發現這兩個類基本類似

這里還有一組常量值

UIActionSheetStyle

Specifies the style of an actionsheet.

typedef enum { 
UIActionSheetStyleAutomatic  =-1, 
UIActionSheetStyleDefault  = UIBarStyleDefault, 
UIActionSheetStyleBlackTranslucent =UIBarStyleBlackTranslucent, 
UIActionSheetStyleBlackOpaque  =UIBarStyleBlackOpaque, 
} UIActionSheetStyle; 

Constants

UIActionSheetStyleAutomatic

Takes the appearance of the bottom bar if specified; otherwise,same as UIActionSheetStyleDefault.

UIActionSheetStyleDefault

 Thedefault style.

UIActionSheetStyleBlackTranslucent

 Ablack translucent style.

UIActionSheetStyleBlackOpaque

 Ablack opaque style.

協議接口學習

UIActionSheetDelegate協議接口

The UIActionSheetDelegate protocoldefines the methods a delegate of a UIActionSheet object shouldimplement. The delegate implements the button actions and any othercustom behavior. Some of the methods defined in this protocol areoptional.

Responding to Actions

–actionSheet:clickedButtonAtIndex: 

Customizing Behavior

–willPresentActionSheet: 
–didPresentActionSheet: 
–actionSheet:willDismissWithButtonIndex: 
–actionSheet:didDismissWithButtonIndex: 

Canceling

–actionSheetCancel: