获得ios设备版本

获得ios设备版本。

/**
 *  获取保存用户信息的字典
 *
 *  @return 用户信息字典
 */
+ (nsstring*)devicestring
{

    struct utsname systeminfo;

    uname(&systeminfo);

    nsstring *platform = [nsstring stringwithcstring:systeminfo.machine encoding:nsutf8stringencoding];


    if ([platform isequaltostring:@"iphone1,1"]) return @"iphone 2g (a1203)";
    if ([platform isequaltostring:@"iphone1,2"]) return @"iphone 3g (a1241/a1324)";
    if ([platform isequaltostring:@"iphone2,1"]) return @"iphone 3gs (a1303/a1325)";
    if ([platform isequaltostring:@"iphone3,1"]) return @"iphone 4 (a1332)";
    if ([platform isequaltostring:@"iphone3,2"]) return @"iphone 4 (a1332)";
    if ([platform isequaltostring:@"iphone3,3"]) return @"iphone 4 (a1349)";
    if ([platform isequaltostring:@"iphone4,1"]) return @"iphone 4s (a1387/a1431)";
    if ([platform isequaltostring:@"iphone5,1"]) return @"iphone 5 (a1428)";
    if ([platform isequaltostring:@"iphone5,2"]) return @"iphone 5 (a1429/a1442)";
    if ([platform isequaltostring:@"iphone5,3"]) return @"iphone 5c (a1456/a1532)";
    if ([platform isequaltostring:@"iphone5,4"]) return @"iphone 5c (a1507/a1516/a1526/a1529)";
    if ([platform isequaltostring:@"iphone6,1"]) return @"iphone 5s (a1453/a1533)";
    if ([platform isequaltostring:@"iphone6,2"]) return @"iphone 5s (a1457/a1518/a1528/a1530)";
    if ([platform isequaltostring:@"iphone7,1"]) return @"iphone 6 plus (a1522/a1524)";
    if ([platform isequaltostring:@"iphone7,2"]) return @"iphone 6 (a1549/a1586)";
    if ([platform isequaltostring:@"iphone8,1"]) return @"iphone 6 s (a1522/a1524)";
    if ([platform isequaltostring:@"iphone8,2"]) return @"iphone 6 s plus";

    //        if ([platform isequaltostring:@"ipod1,1"])   return @"ipod touch 1g (a1213)";
    //        if ([platform isequaltostring:@"ipod2,1"])   return @"ipod touch 2g (a1288)";
    //        if ([platform isequaltostring:@"ipod3,1"])   return @"ipod touch 3g (a1318)";
    //        if ([platform isequaltostring:@"ipod4,1"])   return @"ipod touch 4g (a1367)";
    //        if ([platform isequaltostring:@"ipod5,1"])   return @"ipod touch 5g (a1421/a1509)";
    //
    //        if ([platform isequaltostring:@"ipad1,1"])   return @"ipad 1g (a1219/a1337)";
    //
    //        if ([platform isequaltostring:@"ipad2,1"])   return @"ipad 2 (a1395)";
    //        if ([platform isequaltostring:@"ipad2,2"])   return @"ipad 2 (a1396)";
    //        if ([platform isequaltostring:@"ipad2,3"])   return @"ipad 2 (a1397)";
    //        if ([platform isequaltostring:@"ipad2,4"])   return @"ipad 2 (a1395+new chip)";
    //        if ([platform isequaltostring:@"ipad2,5"])   return @"ipad mini 1g (a1432)";
    //        if ([platform isequaltostring:@"ipad2,6"])   return @"ipad mini 1g (a1454)";
    //        if ([platform isequaltostring:@"ipad2,7"])   return @"ipad mini 1g (a1455)";
    //
    //        if ([platform isequaltostring:@"ipad3,1"])   return @"ipad 3 (a1416)";
    //        if ([platform isequaltostring:@"ipad3,2"])   return @"ipad 3 (a1403)";
    //        if ([platform isequaltostring:@"ipad3,3"])   return @"ipad 3 (a1430)";
    //        if ([platform isequaltostring:@"ipad3,4"])   return @"ipad 4 (a1458)";
    //        if ([platform isequaltostring:@"ipad3,5"])   return @"ipad 4 (a1459)";
    //        if ([platform isequaltostring:@"ipad3,6"])   return @"ipad 4 (a1460)";
    //
    //        if ([platform isequaltostring:@"ipad4,1"])   return @"ipad air (a1474)";
    //        if ([platform isequaltostring:@"ipad4,2"])   return @"ipad air (a1475)";
    //        if ([platform isequaltostring:@"ipad4,3"])   return @"ipad air (a1476)";
    //        if ([platform isequaltostring:@"ipad4,4"])   return @"ipad mini 2g (a1489)";
    //        if ([platform isequaltostring:@"ipad4,5"])   return @"ipad mini 2g (a1490)";
    //        if ([platform isequaltostring:@"ipad4,6"])   return @"ipad mini 2g (a1491)";
    //
    //        if ([platform isequaltostring:@"i386"])      return @"iphone simulator";
    //        if ([platform isequaltostring:@"x86_64"])    return @"iphone simulator";

    return platform;
}