IOS- 得到系统版本

-(void)getSystemInfo{
    size_t size;
    sysctlbyname("hw.machine", NULL, &size, NULL, 0);
    char *machine = (char*)malloc(size);
    sysctlbyname("hw.machine", machine, &size, NULL, 0);
    NSString *platform = [NSString stringWithCString:machine encoding:NSUTF8StringEncoding];
    machine = nil;

    NSString *strSysName = [[UIDevice currentDevice] systemVersion];



    [AppManager setUserDefaultsValue:platform key:@"phoneType"];
    [AppManager setUserDefaultsValue:strSysName key:@"phoneSystem"];
    [AppManager setUserDefaultsValue:g_versionSNO key:@"version"];
    platform = nil;
    strSysName = nil;
}