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解决方案：
NSMutableDictionary *targetMutableDictionary = [mutableDictionary1 copy];
[targetMutableDictionary addEntriesFromDictionary:mutableDictionary2];
两个NSMutableDictionary合并成一个NSMutableDictionary
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原文地址：http://www.cnblogs.com/ritian/p/5248000.html
