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ios 下两种生成唯一字符串的方法
CFUUIDRef uuidRef =CFUUIDCreate(NULL);
CFStringRef uuidStringRef =CFUUIDCreateString(NULL, uuidRef);
CFRelease(uuidRef);
NSString *uniqueId = (__bridgeNSString *)uuidStringRef;
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原文地址：http://www.cnblogs.com/loserof/p/4763975.html
