最全的iOS 如何获取设备的各种信息

作者: Anchoriter | 来源:发表于2017-08-14 19:09 被阅读257次

一、目录结构:

获取屏幕宽度与高度
获取设备版本号
获取iPhone名称
获取app版本号
获取电池电量
获取当前系统名称
获取当前系统版本号
获取通用的唯一识别码UUID
获取当前设备IP
获取总内存大小
获取当前可用内存
获取精准电池电量
获取电池当前的状态（共有4种状态）
获取设备当前的语言
获取device_model
获取mac 地址
获取IP地址
获取设备上次重启的时间
获取广告位标识符
获取CPU总数目
获取已使用的CPU比例
获取每个cpu的使用比例
获取磁盘总空间
获取未使用的磁盘空间
获取已使用的磁盘空间
获取系统总内存空间
获取活跃的内存,正在使用或者很短时间内被使用过
获取最近使用过,但是目前处于不活跃状态的内存
获取空闲的内存空间
获取已使用的内存空间
用来存放内核和数据结构的内存,framework、用户级别的应用无法分配
可释放的内存空间：内存吃紧自动释放，针对大对象存放所需的大块内存空间

二、具体内容

1. 获取屏幕宽度与高度

// 屏幕宽度
+ (CGFloat)getDeviceScreenWidth {
    return [UIScreen mainScreen].bounds.size.width;
}
// 屏幕高度
+ (CGFloat)getDeviceScreenHeight {
    return [UIScreen mainScreen].bounds.size.height;
}

[UIScreen mainScreen].bounds.size.width用的很普遍，一般来说定义成宏更好，然后根据屏幕宽高进行尺寸的适配。

2. 获取设备版本号

+ (NSString *)getDeviceName {
    // 需要#import "sys/utsname.h"
    struct utsname systemInfo;
    uname(&systemInfo);
    NSString *deviceString = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];
     if ([deviceString isEqualToString:@"iPhone3,1"])    return @"iPhone 4";
    if ([deviceString isEqualToString:@"iPhone3,2"])    return @"iPhone 4";
    if ([deviceString isEqualToString:@"iPhone3,3"])    return @"iPhone 4";
    if ([deviceString isEqualToString:@"iPhone4,1"])    return @"iPhone 4S";
    if ([deviceString isEqualToString:@"iPhone5,1"])    return @"iPhone 5";
    if ([deviceString isEqualToString:@"iPhone5,2"])    return @"iPhone 5 (GSM+CDMA)";
    if ([deviceString isEqualToString:@"iPhone5,3"])    return @"iPhone 5c (GSM)";
    if ([deviceString isEqualToString:@"iPhone5,4"])    return @"iPhone 5c (GSM+CDMA)";
    if ([deviceString isEqualToString:@"iPhone6,1"])    return @"iPhone 5s (GSM)";
    if ([deviceString isEqualToString:@"iPhone6,2"])    return @"iPhone 5s (GSM+CDMA)";
    if ([deviceString isEqualToString:@"iPhone7,1"])    return @"iPhone 6 Plus";
    if ([deviceString isEqualToString:@"iPhone7,2"])    return @"iPhone 6";
    if ([deviceString isEqualToString:@"iPhone8,1"])    return @"iPhone 6s";
    if ([deviceString isEqualToString:@"iPhone8,2"])    return @"iPhone 6s Plus";
    if ([deviceString isEqualToString:@"iPhone8,4"])    return @"iPhone SE";
    // 日行两款手机型号均为日本独占，可能使用索尼FeliCa支付方案而不是苹果支付
    if ([deviceString isEqualToString:@"iPhone9,1"])    return @"国行、日版、港行iPhone 7";
    if ([deviceString isEqualToString:@"iPhone9,2"])    return @"港行、国行iPhone 7 Plus";
    if ([deviceString isEqualToString:@"iPhone9,3"])    return @"美版、台版iPhone 7";
    if ([deviceString isEqualToString:@"iPhone9,4"])    return @"美版、台版iPhone 7 Plus";
    if ([deviceString isEqualToString:@"iPhone10,1"])   return @"国行(A1863)、日行(A1906)iPhone 8";
    if ([deviceString isEqualToString:@"iPhone10,4"])   return @"美版(Global/A1905)iPhone 8";
    if ([deviceString isEqualToString:@"iPhone10,2"])   return @"国行(A1864)、日行(A1898)iPhone 8 Plus";
    if ([deviceString isEqualToString:@"iPhone10,5"])   return @"美版(Global/A1897)iPhone 8 Plus";
    if ([deviceString isEqualToString:@"iPhone10,3"])   return @"国行(A1865)、日行(A1902)iPhone X";
    if ([deviceString isEqualToString:@"iPhone10,6"])   return @"美版(Global/A1901)iPhone X";
    
    if ([deviceString isEqualToString:@"iPod1,1"])      return @"iPod Touch 1G";
    if ([deviceString isEqualToString:@"iPod2,1"])      return @"iPod Touch 2G";
    if ([deviceString isEqualToString:@"iPod3,1"])      return @"iPod Touch 3G";
    if ([deviceString isEqualToString:@"iPod4,1"])      return @"iPod Touch 4G";
    if ([deviceString isEqualToString:@"iPod5,1"])      return @"iPod Touch (5 Gen)";
    
    if ([deviceString isEqualToString:@"iPad1,1"])      return @"iPad";
    if ([deviceString isEqualToString:@"iPad1,2"])      return @"iPad 3G";
    if ([deviceString isEqualToString:@"iPad2,1"])      return @"iPad 2 (WiFi)";
    if ([deviceString isEqualToString:@"iPad2,2"])      return @"iPad 2";
    if ([deviceString isEqualToString:@"iPad2,3"])      return @"iPad 2 (CDMA)";
    if ([deviceString isEqualToString:@"iPad2,4"])      return @"iPad 2";
    if ([deviceString isEqualToString:@"iPad2,5"])      return @"iPad Mini (WiFi)";
    if ([deviceString isEqualToString:@"iPad2,6"])      return @"iPad Mini";
    if ([deviceString isEqualToString:@"iPad2,7"])      return @"iPad Mini (GSM+CDMA)";
    if ([deviceString isEqualToString:@"iPad3,1"])      return @"iPad 3 (WiFi)";
    if ([deviceString isEqualToString:@"iPad3,2"])      return @"iPad 3 (GSM+CDMA)";
    if ([deviceString isEqualToString:@"iPad3,3"])      return @"iPad 3";
    if ([deviceString isEqualToString:@"iPad3,4"])      return @"iPad 4 (WiFi)";
    if ([deviceString isEqualToString:@"iPad3,5"])      return @"iPad 4";
    if ([deviceString isEqualToString:@"iPad3,6"])      return @"iPad 4 (GSM+CDMA)";
    if ([deviceString isEqualToString:@"iPad4,1"])      return @"iPad Air (WiFi)";
    if ([deviceString isEqualToString:@"iPad4,2"])      return @"iPad Air (Cellular)";
    if ([deviceString isEqualToString:@"iPad4,4"])      return @"iPad Mini 2 (WiFi)";
    if ([deviceString isEqualToString:@"iPad4,5"])      return @"iPad Mini 2 (Cellular)";
    if ([deviceString isEqualToString:@"iPad4,6"])      return @"iPad Mini 2";
    if ([deviceString isEqualToString:@"iPad4,7"])      return @"iPad Mini 3";
    if ([deviceString isEqualToString:@"iPad4,8"])      return @"iPad Mini 3";
    if ([deviceString isEqualToString:@"iPad4,9"])      return @"iPad Mini 3";
    if ([deviceString isEqualToString:@"iPad5,1"])      return @"iPad Mini 4 (WiFi)";
    if ([deviceString isEqualToString:@"iPad5,2"])      return @"iPad Mini 4 (LTE)";
    if ([deviceString isEqualToString:@"iPad5,3"])      return @"iPad Air 2";
    if ([deviceString isEqualToString:@"iPad5,4"])      return @"iPad Air 2";
    if ([deviceString isEqualToString:@"iPad6,3"])      return @"iPad Pro 9.7";
    if ([deviceString isEqualToString:@"iPad6,4"])      return @"iPad Pro 9.7";
    if ([deviceString isEqualToString:@"iPad6,7"])      return @"iPad Pro 12.9";
    if ([deviceString isEqualToString:@"iPad6,8"])      return @"iPad Pro 12.9";
    if ([machineString isEqualToString:@"iPad6,11"])    return @"iPad 5 (WiFi)";
    if ([machineString isEqualToString:@"iPad6,12"])    return @"iPad 5 (Cellular)";
    if ([machineString isEqualToString:@"iPad7,1"])     return @"iPad Pro 12.9 inch 2nd gen (WiFi)";
    if ([machineString isEqualToString:@"iPad7,2"])     return @"iPad Pro 12.9 inch 2nd gen (Cellular)";
    if ([machineString isEqualToString:@"iPad7,3"])     return @"iPad Pro 10.5 inch (WiFi)";
    if ([machineString isEqualToString:@"iPad7,4"])     return @"iPad Pro 10.5 inch (Cellular)";
    
   if ([deviceString isEqualToString:@"AppleTV2,1"])    return @"Apple TV 2";
   if ([deviceString isEqualToString:@"AppleTV3,1"])    return @"Apple TV 3";
   if ([deviceString isEqualToString:@"AppleTV3,2"])    return @"Apple TV 3";
   if ([deviceString isEqualToString:@"AppleTV5,3"])    return @"Apple TV 4";

    if ([deviceString isEqualToString:@"i386"])         return @"Simulator";
    if ([deviceString isEqualToString:@"x86_64"])       return @"Simulator";
    return deviceString;
}

3. 获取iPhone名称

// 获取iPhone名称
+ (NSString *)getiPhoneName {
    return [UIDevice currentDevice].name;
}

4. 获取app版本号

// 获取app版本号
+ (NSString *)getAPPVerion {
    return [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"];
}

5. 获取电池电量

// 获取电池电量
+ (CGFloat)getBatteryLevel {
    return [UIDevice currentDevice].batteryLevel;
}

这个方法获取电池电量不是很精确，下边会介绍一个获取精确电池电量的。

6. 获取当前系统名称

// 当前系统名称
+ (NSString *)getSystemName {
    return [UIDevice currentDevice].systemName;
}

7. 获取当前系统版本号

// 当前系统版本号
+ (NSString *)getSystemVersion {
    return [UIDevice currentDevice].systemVersion;
}

8. 获取通用的唯一识别码UUID

// 通用唯一识别码UUID
+ (NSString *)getUUID {
    return [[UIDevice currentDevice] identifierForVendor].UUIDString;
}

9. 获取当前设备IP

// 获取当前设备IP
+ (NSString *)getDeviceIPAdress {
    NSString *address = @"an error occurred when obtaining ip address";
    struct ifaddrs *interfaces = NULL;
    struct ifaddrs *temp_addr = NULL;
    int success = 0;
    success = getifaddrs(&interfaces);
    if (success == 0) { // 0 表示获取成功
        temp_addr = interfaces;
        while (temp_addr != NULL) {
            if( temp_addr->ifa_addr->sa_family == AF_INET) {
                // Check if interface is en0 which is the wifi connection on the iPhone
                if ([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {
                    // Get NSString from C String
                    address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
                }
            }
            temp_addr = temp_addr->ifa_next;
        }
    }
    freeifaddrs(interfaces);
    return address;
}

10. 获取总内存大小

// 获取总内存大小
+ (long long)getTotalMemorySize {
    return [NSProcessInfo processInfo].physicalMemory;
}

11. 获取当前可用内存

// 获取当前可用内存
+ (long long)getAvailableMemorySize {
    vm_statistics_data_t vmStats;
    mach_msg_type_number_t infoCount = HOST_VM_INFO_COUNT;
    kern_return_t kernReturn = host_statistics(mach_host_self(), HOST_VM_INFO, (host_info_t)&vmStats, &infoCount);
    if (kernReturn != KERN_SUCCESS)
    {
        return NSNotFound;
    }
    return ((vm_page_size * vmStats.free_count + vm_page_size * vmStats.inactive_count));
}

12. 获取精准电池电量

// 获取精准电池电量
+ (CGFloat)getCurrentBatteryLevel {
    UIApplication *app = [UIApplication sharedApplication];
    if (app.applicationState == UIApplicationStateActive||app.applicationState==UIApplicationStateInactive) {
        Ivar ivar=  class_getInstanceVariable([app class],"_statusBar");
        id status  = object_getIvar(app, ivar);
        for (id aview in [status subviews]) {
            int batteryLevel = 0;
            for (id bview in [aview subviews]) {
                if ([NSStringFromClass([bview class]) caseInsensitiveCompare:@"UIStatusBarBatteryItemView"] == NSOrderedSame&&[[[UIDevice currentDevice] systemVersion] floatValue] >=6.0) {
                    Ivar ivar=  class_getInstanceVariable([bview class],"_capacity");
                    if(ivar) {
                        batteryLevel = ((int (*)(id, Ivar))object_getIvar)(bview, ivar);
                        if (batteryLevel > 0 && batteryLevel <= 100) {
                            return batteryLevel;
                        } else {
                            return 0;
                        }
                    }
                }
            }
        }
    }
    return 0;
}

上面这个方法是通过runtime获取电池电量控件类私有变量的值，较为精确。

13. 获取电池当前的状态（共有4种状态）

// 获取电池当前的状态，共有4种状态
+ (NSString *) getBatteryState {
    UIDevice *device = [UIDevice currentDevice];
    if (device.batteryState == UIDeviceBatteryStateUnknown) {
        return @"UnKnow";
    } else if (device.batteryState == UIDeviceBatteryStateUnplugged){
        return @"Unplugged";
    } else if (device.batteryState == UIDeviceBatteryStateCharging){
        return @"Charging";
    } else if (device.batteryState == UIDeviceBatteryStateFull){
        return @"Full";
    }
    return nil;
}

14. 获取设备当前的语言

// 获取当前语言
+ (NSString *)getDeviceLanguage {
    NSArray *languageArray = [NSLocale preferredLanguages];
    return [languageArray objectAtIndex:0];
}

15. 获取device_model

// 获取device_model
+ (NSString *)getDeviceModel {
    struct utsname systemInfo;
    uname(&systemInfo);
    NSString *device_model = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];
    return device_model;
}

16. 获取mac 地址

// 获取mac 地址
+ (NSString *) getMacAddress {
    int mib[6];
    size_t len;
    char *buf;
    unsigned char *ptr;
    struct if_msghdr *ifm;
    struct sockaddr_dl *sdl;
    
    mib[0] = CTL_NET;
    mib[1] = AF_ROUTE;
    mib[2] = 0;
    mib[3] = AF_LINK;
    mib[4] = NET_RT_IFLIST;
    
    if ((mib[5] = if_nametoindex("en0")) == 0) {
        printf("Error: if_nametoindex error/n");
        return NULL;
    }
    
    if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {
        printf("Error: sysctl, take 1/n");
        return NULL;
    }
    
    if ((buf = malloc(len)) == NULL) {
        printf("Could not allocate memory. error!/n");
        return NULL;
    }
    
    if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
        printf("Error: sysctl, take 2");
        return NULL;
    }
    
    ifm = (struct if_msghdr *)buf;
    sdl = (struct sockaddr_dl *)(ifm + 1);
    ptr = (unsigned char *)LLADDR(sdl);
    
    NSString *outstring = [NSString stringWithFormat:@"%02x%02x%02x%02x%02x%02x", *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];
    free(buf);
    
    return [outstring uppercaseString];
}

17. 获取IP地址

// 获取IP地址
+ (NSString *) getDeviceIPAddresses {
    int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    
    NSMutableArray *ips = [NSMutableArray array];
    
    int BUFFERSIZE = 4096;
    
    struct ifconf ifc;
    
    char buffer[BUFFERSIZE], *ptr, lastname[IFNAMSIZ], *cptr;
    
    struct ifreq *ifr, ifrcopy;
    
    ifc.ifc_len = BUFFERSIZE;
    ifc.ifc_buf = buffer;
    
    if (ioctl(sockfd, SIOCGIFCONF, &ifc) >= 0){
        
        for (ptr = buffer; ptr < buffer + ifc.ifc_len; ){
            
            ifr = (struct ifreq *)ptr;
            int len = sizeof(struct sockaddr);
            
            if (ifr->ifr_addr.sa_len > len) {
                len = ifr->ifr_addr.sa_len;
            }
            
            ptr += sizeof(ifr->ifr_name) + len;
            if (ifr->ifr_addr.sa_family != AF_INET) continue;
            if ((cptr = (char *)strchr(ifr->ifr_name, ':')) != NULL) *cptr = 0;
            if (strncmp(lastname, ifr->ifr_name, IFNAMSIZ) == 0) continue;
            
            memcpy(lastname, ifr->ifr_name, IFNAMSIZ);
            ifrcopy = *ifr;
            ioctl(sockfd, SIOCGIFFLAGS, &ifrcopy);
            
            if ((ifrcopy.ifr_flags & IFF_UP) == 0) continue;
            
            NSString *ip = [NSString  stringWithFormat:@"%s", inet_ntoa(((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr)];
            [ips addObject:ip];
        }
    }
    
    close(sockfd);
    NSString *deviceIP = @"";
    
    for (int i=0; i < ips.count; i++) {
        if (ips.count > 0) {
            deviceIP = [NSString stringWithFormat:@"%@",ips.lastObject];
        }
    }
    return deviceIP;
}

18. 获取设备上次重启的时间

// 获取设备上次重启的时间
+ (NSString *)getDeviceModel {
    NSTimeInterval time = [[NSProcessInfo processInfo] systemUptime];
   NSDate *lastRestartDate = [[NSDate alloc] initWithTimeIntervalSinceNow:(0 - time)];
//用于格式化NSDate对象  
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];  
//设置格式：zzz表示时区  
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss zzz"];  
//NSDate转NSString  
NSString *currentDateString = [dateFormatter stringFromDate:currentDate]; 
   return currentDateString;
}

19. 获取广告位标识符

在同一个设备上的所有App都会取到相同的值，是苹果专门给各广告提供商用来追踪用户而设的，用户可以在设置|隐私|广告追踪里重置此id的值，或限制此id的使用，故此id有可能会取不到值，但好在Apple默认是允许追踪的，而且一般用户都不知道有这么个设置，所以基本上用来监测推广效果，是戳戳有余了

// 获取广告位标识符
+ (NSString *)getIDFA {
     NSString *idfa = [[[ASIdentifierManager sharedManager] advertisingIdentifier] UUIDString];
    return idfa;
}

20. 获取CPU总数目

// 获取CPU总数目
+ (NSString *) getCPUCount {
     return [NSProcessInfo processInfo].activeProcessorCount;
}

21. 获取已使用的CPU比例

// 获取已使用的CPU比例
+ (NSString *) getCPUUsage {
     float cpu = 0;
    NSArray *cpus = [self getPerCPUUsage];
    if (cpus.count == 0) return -1;
    for (NSNumber *n in cpus) {
        cpu += n.floatValue;
    }
NSString *stringFloat = [NSString stringWithFormat:@"%f",cpu];
return stringFloat;
}

22. 获取每个cpu的使用比例

// 获取每个cpu的使用比例
- (NSArray *)getPerCPUUsage {
    processor_info_array_t _cpuInfo, _prevCPUInfo = nil;
    mach_msg_type_number_t _numCPUInfo, _numPrevCPUInfo = 0;
    unsigned _numCPUs;
    NSLock *_cpuUsageLock;
    
    int _mib[2U] = { CTL_HW, HW_NCPU };
    size_t _sizeOfNumCPUs = sizeof(_numCPUs);
    int _status = sysctl(_mib, 2U, &_numCPUs, &_sizeOfNumCPUs, NULL, 0U);
    if (_status)
        _numCPUs = 1;
    
    _cpuUsageLock = [[NSLock alloc] init];
    
    natural_t _numCPUsU = 0U;
    kern_return_t err = host_processor_info(mach_host_self(), PROCESSOR_CPU_LOAD_INFO, &_numCPUsU, &_cpuInfo, &_numCPUInfo);
    if (err == KERN_SUCCESS) {
        [_cpuUsageLock lock];
        
        NSMutableArray *cpus = [NSMutableArray new];
        for (unsigned i = 0U; i < _numCPUs; ++i) {
            Float32 _inUse, _total;
            if (_prevCPUInfo) {
                _inUse = (
                          (_cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_USER]   - _prevCPUInfo[(CPU_STATE_MAX * i) + CPU_STATE_USER])
                          + (_cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_SYSTEM] - _prevCPUInfo[(CPU_STATE_MAX * i) + CPU_STATE_SYSTEM])
                          + (_cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_NICE]   - _prevCPUInfo[(CPU_STATE_MAX * i) + CPU_STATE_NICE])
                          );
                _total = _inUse + (_cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_IDLE] - _prevCPUInfo[(CPU_STATE_MAX * i) + CPU_STATE_IDLE]);
            } else {
                _inUse = _cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_USER] + _cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_SYSTEM] + _cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_NICE];
                _total = _inUse + _cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_IDLE];
            }
            [cpus addObject:@(_inUse / _total)];
        }
        
        [_cpuUsageLock unlock];
        if (_prevCPUInfo) {
            size_t prevCpuInfoSize = sizeof(integer_t) * _numPrevCPUInfo;
            vm_deallocate(mach_task_self(), (vm_address_t)_prevCPUInfo, prevCpuInfoSize);
        }
        return cpus;
    } else {
        return nil;
    }
}

23.获取磁盘总空间

// 获取磁盘总空间
- (int64_t)getTotalDiskSpace {
    NSError *error = nil;
    NSDictionary *attrs = [[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:&error];
    if (error) return -1;
    int64_t space =  [[attrs objectForKey:NSFileSystemSize] longLongValue];
    if (space < 0) space = -1;
    return space;
}

24. 获取未使用的磁盘空间

// 获取未使用的磁盘空间
- (int64_t)getFreeDiskSpace {
    NSError *error = nil;
    NSDictionary *attrs = [[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:&error];
    if (error) return -1;
    int64_t space =  [[attrs objectForKey:NSFileSystemFreeSize] longLongValue];
    if (space < 0) space = -1;
    return space;
}

25. 获取已使用的磁盘空间

// 获取已使用的磁盘空间
- (int64_t)getUsedDiskSpace {
    int64_t totalDisk = [self getTotalDiskSpace];
    int64_t freeDisk = [self getFreeDiskSpace];
    if (totalDisk < 0 || freeDisk < 0) return -1;
    int64_t usedDisk = totalDisk - freeDisk;
    if (usedDisk < 0) usedDisk = -1;
    return usedDisk;
}

26. 获取系统总内存空间

// 获取系统总内存空间
- (int64_t)getTotalMemory {
    int64_t totalMemory = [[NSProcessInfo processInfo] physicalMemory];
    if (totalMemory < -1) totalMemory = -1;
    return totalMemory;
}

27. 获取活跃的内存,正在使用或者很短时间内被使用过

// 获取活跃的内存,正在使用或者很短时间内被使用过
- (int64_t)getActiveMemory {
    mach_port_t host_port = mach_host_self();
    mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
    vm_size_t page_size;
    vm_statistics_data_t vm_stat;
    kern_return_t kern;
    
    kern = host_page_size(host_port, &page_size);
    if (kern != KERN_SUCCESS) return -1;
    kern = host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size);
    if (kern != KERN_SUCCESS) return -1;
    return vm_stat.active_count * page_size;
}

28. 获取最近使用过,但是目前处于不活跃状态的内存

// 获取最近使用过,但是目前处于不活跃状态的内存
- (int64_t)getInActiveMemory {
    mach_port_t host_port = mach_host_self();
    mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
    vm_size_t page_size;
    vm_statistics_data_t vm_stat;
    kern_return_t kern;
    
    kern = host_page_size(host_port, &page_size);
    if (kern != KERN_SUCCESS) return -1;
    kern = host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size);
    if (kern != KERN_SUCCESS) return -1;
    return vm_stat.inactive_count * page_size;
}

29. 获取空闲的内存空间

// 获取空闲的内存空间
- (int64_t)getFreeMemory {
    mach_port_t host_port = mach_host_self();
    mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
    vm_size_t page_size;
    vm_statistics_data_t vm_stat;
    kern_return_t kern;
    
    kern = host_page_size(host_port, &page_size);
    if (kern != KERN_SUCCESS) return -1;
    kern = host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size);
    if (kern != KERN_SUCCESS) return -1;
    return vm_stat.free_count * page_size;
}

30. 获取已使用的内存空间

// 获取已使用的内存空间
- (int64_t)getUsedMemory {
    mach_port_t host_port = mach_host_self();
    mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
    vm_size_t page_size;
    vm_statistics_data_t vm_stat;
    kern_return_t kern;
    
    kern = host_page_size(host_port, &page_size);
    if (kern != KERN_SUCCESS) return -1;
    kern = host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size);
    if (kern != KERN_SUCCESS) return -1;
    return page_size * (vm_stat.active_count + vm_stat.inactive_count + vm_stat.wire_count);
}

31. 用来存放内核和数据结构的内存,framework、用户级别的应用无法分配

// 用来存放内核和数据结构的内存,framework、用户级别的应用无法分配
- (int64_t)getWiredMemory {
    mach_port_t host_port = mach_host_self();
    mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
    vm_size_t page_size;
    vm_statistics_data_t vm_stat;
    kern_return_t kern;
    
    kern = host_page_size(host_port, &page_size);
    if (kern != KERN_SUCCESS) return -1;
    kern = host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size);
    if (kern != KERN_SUCCESS) return -1;
    return vm_stat.wire_count * page_size;
}

32. 可释放的内存空间：内存吃紧自动释放，针对大对象存放所需的大块内存空间

// 可释放的内存空间：内存吃紧自动释放，针对大对象存放所需的大块内存空间
- (int64_t)getPurgableMemory {
    mach_port_t host_port = mach_host_self();
    mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
    vm_size_t page_size;
    vm_statistics_data_t vm_stat;
    kern_return_t kern;
    
    kern = host_page_size(host_port, &page_size);
    if (kern != KERN_SUCCESS) return -1;
    kern = host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size);
    if (kern != KERN_SUCCESS) return -1;
    return vm_stat.purgeable_count * page_size;
}