When a method marked as conditional is called, the presence or absence of the specified preprocessing symbol determines whether the call is included or omitted.
当调用标记为条件的方法时，指定的预处理符号的存在或不存在决定是否包含或省略此调用。
When a method marked as conditional is called, the presence or absence of the specified preprocessing symbol determines whether the call is included or omitted.
当调用标记为条件的方法时，指定的预处理符号的存在或不存在决定是否包含或省略此调用。
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