`+ (NSString *) platform{

size_t size;

sysctlbyname("hw.machine", NULL, &size, NULL, 0);

char *machine = malloc(size);

sysctlbyname("hw.machine", machine, &size, NULL, 0);

NSString *platform = [NSString stringWithCString:machine encoding:NSUTF8StringEncoding];

free(machine);

return platform;

}`

`+ (NSString *) platformString{

NSString *platform = [self platform];

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:@"iPhone8,2"]) return @"iPhone 6s Plus";
if ([platform isEqualToString:@"iPhone8,1"]) return @"iPhone 6s";
if ([platform isEqualToString:@"iPhone8,4"]) return @"iPhone SE";
return platform;

}`
用类名直接调用第二个方法即可得到iPhone型号。