判断ios设备型号

判断代码如下:

- (NSString *)getMachine
{
size_t size;

// 隐式声明的函数sysctlbyname 在c99中是无效的
int nR;
// = sysctlbyname("hw.machine", NULL, &size, NULL,
// 0);
char *machine = (char *)malloc(size);

nR = sysctlbyname("hw.machine", machine, &size, 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;
}

其中 nR = sysctlbyname("hw.machine", machine, &size, NULL, 0);这个函数在c99中是无效的,判断当前编译器是否C99标准,执行如下操作:

#include<stdio.h>
int main()
{
#if (!defined(__STDC__))
 printf("非标准C！");
#elif defined(__STDC_VERSION__)
 printf("标准C版本：%ld。", __STDC_VERSION__);
#else
 printf("旧的标准C。");
#endif
 getchar();
 return 0;
}
预定义宏__STDC__表示标准C。__STDC_VERSION__表示标准C版本。C99对应的是199901L。
（注意有些编译器默认没有定义__STDC_VERSION__，甚至没定义__STDC__。所以查编译器手册更保险一点。ios支持C99）

struct utsname systemInfo;
uname(&systemInfo);
NSString *deviceString = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];
NSLog(@"%@",deviceString);

这个函数也可以达到效果,