iOS生成一个32位的UUID

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- (NSString *)uuidString

{

    CFUUIDRef uuid_ref = CFUUIDCreate(NULL);

    CFStringRef uuid_string_ref= CFUUIDCreateString(NULL, uuid_ref);

    NSString *uuid = [NSString stringWithString:(__bridge NSString *)uuid_string_ref];

    CFRelease(uuid_ref);

    CFRelease(uuid_string_ref);

    return [uuid lowercaseString];

}

iOS生成一个32位的UUID

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原文地址：http://www.cnblogs.com/liuting-1204/p/5602514.html