每一个选择是定义的菜单上，一个标题字符串，一个选项字符串和一个可选的图标。

Each selection is defined in terms of a menu, one title string, one option string and an optional icon.

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标题字符串添加到条目数组后，就释放标题字符串对象，这样下一个标题就不会添加到前一个标题上。

After the title string is added to the items array, you release the title string object so that the next title is not appended to the previous title.

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