Group Read Receipt Version
群已读回执版本枚举声明.
0,标识旧版本方案; 1,标识V2版本方案.
See also
<a href="https://gitbook. rongcloud. net/imsdk/function/Group Read Receipt. html">
https://gitbook.rongcloud.net/imsdk/function/GroupReadReceipt.html
Functions
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Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
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Returns an array containing the constants of this enum type, in the order they're declared. This method may be used to iterate over the constants.