操作表(UIActionSheet)和警报(UIAlertView)

在类声明的超类后添加协议名称（UIActionSheetDelegate）

通过按键触发buttonPressed

 

- (IBAction)buttonPressed:(id)sender {
    UIActionSheet *actionSheet = [[UIActionSheet alloc]
                                  initWithTitle:@"Are you sure?"
                                  delegate:self
                                  cancelButtonTitle:@"No Way!"     //取消
                                  destructiveButtonTitle:@"Yes, I’m Sure!"    //继续
                                  otherButtonTitles:nil];   //其他按钮，若没则nil
    [actionSheet showInView:self.view];   //显示自己
    

}

- (void)actionSheet:(UIActionSheet *)actionSheet
didDismissWithButtonIndex:(NSInteger)buttonIndex
{
    if (buttonIndex != [actionSheet cancelButtonIndex])
    {
        NSString *msg = nil;
        
        if (nameField.text.length > 0)
            msg = [[NSString alloc] initWithFormat:
                   @"You can breathe easy, %@, everything went OK.",
                   nameField.text];
        else
            msg = @"You can breathe easy, everything went OK.";
        
        UIAlertView *alert = [[UIAlertView alloc]                      //警报创建与应用
                              initWithTitle:@"Something was done"
                              message:msg
                              delegate:self
                              cancelButtonTitle:@"Phew!"
                              otherButtonTitles:nil];
        [alert show];
    }
}