iOS 获取手机型号4s 5s 6s

//获取手机的型号 iPhone 4s iPhone 5s iPhone6s 。。。。
+ (NSString*) doDevicePlatform
{
size_t size;
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:NSUTF8StringEncoding];
free(machine);

if ([platform isEqualToString:@"iPhone3,1"]||[platform isEqualToString:@"iPhone3,2"]||[platform isEqualToString:@"iPhone3,3"]) {

platform = @"iPhone 4";

} else if ([platform isEqualToString:@"iPhone4,1"]) {

platform = @"iPhone 4S";

} else if ([platform isEqualToString:@"iPhone5,1"]||[platform isEqualToString:@"iPhone5,2"]) {

platform = @"iPhone 5";

}else if ([platform isEqualToString:@"iPhone5,3"]||[platform isEqualToString:@"iPhone5,4"]) {

platform = @"iPhone 5C";

}else if ([platform isEqualToString:@"iPhone6,2"]||[platform isEqualToString:@"iPhone6,1"]) {

platform = @"iPhone 5S";

}

return platform;
}