//点击任何处，弹出UIActionSheet-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{    UIActionSheet *sheet=[[UIActionSheet alloc]initWithTitle:@"标题" delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:nil, nil];        // 逐个添加按钮（比如可以是数组循环）    [sheet addButtonWithTitle:@"Item A"];    [sheet addButtonWithTitle:@"Item B"];    [sheet addButtonWithTitle:@"Item C"];    // 同时添加一个取消按钮    [sheet addButtonWithTitle:@"Cancel"];        sheet.cancelButtonIndex = sheet.numberOfButtons-1;    [sheet showInView:self.view];}