UIActionSheet动态添加按钮

//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];

}