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在串行队列中添加删除log数据,防止多线程读写
读取log数据返回NSArray而不是NSMutableArray,修复DoraemonNSLogListViewController对log进行reverseObjectEnumerator时修改数据源,导致数据丢失问题。
参考:https://developer.apple.com/documentation/foundation/nsarray/1415734-reverseobjectenumerator#:~:text=When%20you%20use%20this%20method%20with%20mutable%20subclasses%20of%20NSArray%2C%20you%20must%20not%20modify%20the%20array%20during%20enumeration.