IOS弹出框

参考：http://www.cnblogs.com/minglz/archive/2012/11/27/2788343.html

（1）@interface YYWViewController : UIViewController <UIActionSheetDelegate>

（2）- (IBAction)btnAlert:(id)sender {

    UIActionSheet * actionSheet = [[UIActionSheetalloc]

                                   initWithTitle:@"Are you sure?"

                                   delegate:self

                                   cancelButtonTitle:@"No Way!"

                                   destructiveButtonTitle:@"Yes, I'm Sure!"

                                   otherButtonTitles:nil];

    [actionSheet showInView:self.view];

}

（3）

- (void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex

{

    if(buttonIndex != [actionSheet cancelButtonIndex])

    {

        NSString *msg = nil;

                 if(_nameTextField.text.length > 0)

            msg = [[NSStringalloc] initWithFormat:@"You can breathe easy, %@, everything went OK.", _nameTextField.text];

        else

            msg = @"You can breathe easy, everything went OK.";

        

        UIAlertView *alert = [[UIAlertView alloc]

                              initWithTitle:@"Something was done"

                              message:msg

                              delegate:self

                              cancelButtonTitle:@"Phew!"

                              otherButtonTitles:nil];

        

        [alert show];

    }

}