［iPhone代码片断之一］UIActionSheet&UIAlertView的应用

类需要符合<UIActionViewDelegate>协议。

示例代码如下：

- (IBAction)buttonPressed:(id)sender {    NSLog(@"buttonPressed");    UIActionSheet *actionSheet = [[UIActionSheet alloc]                                  initWithTitle:@"您要查看进度情况吗？"                                   delegate:self//操作表的代理，按钮被按下时收到通知，然后回调协议中的相关方法                                  cancelButtonTitle:@"取消"                                  destructiveButtonTitle:@"确定"                                  otherButtonTitles:nil];    [actionSheet showInView:self.view];}-(void)actionSheet:(UIActionSheet *)actionSheet                     didDismissWithButtonIndex:(NSInteger)buttonIndex{    NSString *msg = nil;    UIAlertView *alert = nil;    if(buttonIndex == [actionSheet destructiveButtonIndex]){        if(nameField.text.length>0){            msg = [[NSString alloc] initWithFormat:@"您歇会儿吧,%@,一切正常！",nameField.text];        }else{            msg = @"您歇会儿吧，一切正常！";        }        alert = [[UIAlertView alloc] initWithTitle:@"搞定了"                                                        message:msg                                                       delegate:nil//不需要处理按钮按下事件，将委托设置为空                                              cancelButtonTitle:@"我知道了"                                              otherButtonTitles: nil];    }else if(buttonIndex==[actionSheet cancelButtonIndex]){        msg = @"呜呜，没搞定呢，还在加班呢！";        alert = [[UIAlertView alloc] initWithTitle:@"没搞定"                                                        message:msg                                                       delegate:nil                                              cancelButtonTitle:@"靠，继续搞吧！"                                              otherButtonTitles: nil];    }    [alert show];    [alert release];    [msg release];}