iOS7获取UUID以及转换MD5

http://blog.csdn.net/hmt20130412/article/details/38705767

最近项目开发,运用到要获取UUID转MD5,但是iOS7不能使用获取的UDID的接口（涉及到隐私），获取MAC地址的方式的接口在iOS7下也废弃了.目前可能的就是获取UUID了,但是在iOS7下,UUID一个不好的地方是每次调用一次，生成的就不一样，这个会导致一旦APP卸载重装，UUID就变了.

        下面,介绍一种比较方便的方法,来解决这一问题:

         1.导入Security.framework

         2.在github上http://github.com/soffes/sskeychain下载SSKeychain开源库,引入SSKeychain文件夹到你的工程

         

 - (NSString *)getIOSUUID
 {
     NSString *retrieveuuid = [SSKeychain passwordForService:@"com.mohe.userinfo"account:@"uuid"];

     if ( retrieveuuid == nil || [retrieveuuid isEqualToString:@""]){
         CFUUIDRef uuid = CFUUIDCreate(NULL);
         assert(uuid != NULL);
         CFStringRef uuidStr = CFUUIDCreateString(NULL, uuid);

         retrieveuuid = [NSString stringWithFormat:@"%@", uuidStr];

         [SSKeychain setPassword:retrieveuuid forService:@"com.mohe.userinfo"account:@"uuid"];
     }
     return retrieveuuid;
 }

@转换MD5格式的话可以写个类目:

 #import "NSString+MD5.h"
 #import <CommonCrypto/CommonDigest.h>
 @implementation NSString (MD5)
 - (NSString *)md5HexDigest
 {
     const charchar *original_str = [self UTF8String];
     unsigned char result[CC_MD5_DIGEST_LENGTH];
     CC_MD5(original_str, (int)strlen(original_str), result);
     NSMutableString *hash = [NSMutableString string];
     for (int i = 0; i < 16; i++)
         [hash appendFormat:@"%02X", result[i]];
     return [hash lowercaseString];
 }
 @end

@测试后发现,uuid在删除后仍会改变,后面百度了这个博客,大家可以参考:

http://www.cnblogs.com/smileEvday/p/UDID.html