我想在屏幕顶部显示UIActionSheet，是否可能？
private UIActionSheet _imageOptionsActionsheet;
imageOptionsActionsheet = new UIActionSheet("Select Option", null, "Cancel", null, new string[] { "Images Choosen", "My List", "Image Library", "Upload" });
我正在尝试上面的代码，它显示在屏幕的底部，但我想要在屏幕的顶部