ios开发中怎么判断各类设备

代码如下

//获得设备型号

+ (NSString *)getCurrentDeviceModel:(UIViewController *)controller

{

    int mib[2];

    size_t len;

    char *machine;

    mib[0] = CTL_HW;

    mib[1] = HW_MACHINE;

    sysctl(mib, 2, NULL, &len, NULL, 0);

    machine = malloc(len);

    sysctl(mib, 2, machine, &len, NULL, 0);

    NSString *platform = [NSString stringWithCString:machine encoding:NSASCIIStringEncoding];

    free(machine);

    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:@"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;

}