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获取设备上的一些信息

• 获取电池电量(一般用百分数表示,大家自行处理就好)

-(CGFloat)getBatteryQuantity
{    
    return [[UIDevice currentDevice] batteryLevel];
}

• 获取电池状态(UIDeviceBatteryState为枚举类型)

-(UIDeviceBatteryState)getBatteryStauts
{    
    return [UIDevice currentDevice].batteryState;
}

• 获取总内存大小

-(long long)getTotalMemorySize
{    
    return [NSProcessInfo processInfo].physicalMemory;
}

• 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));
}

• 获取已使用内存

- (double)getUsedMemory
{
  task_basic_info_data_t taskInfo;
  mach_msg_type_number_t infoCount = TASK_BASIC_INFO_COUNT;
  kern_return_t kernReturn = task_info(mach_task_self(), 
                                       TASK_BASIC_INFO, 
(task_info_t)&taskInfo, 
                                       &infoCount);
  if (kernReturn != KERN_SUCCESS
      ) {
    return NSNotFound;
  }
  return taskInfo.resident_size;
}

• 获取总磁盘容量

include 
-(long long)getTotalDiskSize
{
    struct statfs buf;
    unsigned long long freeSpace = -1;
    if (statfs("/var", &buf) >= 0)
    {
        freeSpace = (unsigned long long)(buf.f_bsize * buf.f_blocks);
    }
    return freeSpace;
}

• 获取可用磁盘容量

-(long long)getAvailableDiskSize
{
    struct statfs buf;
    unsigned long long freeSpace = -1;
    if (statfs("/var", &buf) >= 0)
    {
        freeSpace = (unsigned long long)(buf.f_bsize * buf.f_bavail);
    }
    return freeSpace;
}

• 容量转换

-(NSString )fileSizeToString:(unsigned long long)fileSize{
    NSInteger KB = 1024;
    NSInteger MB = KB*KB;
    NSInteger GB = MB*KB;
    if (fileSize 

import 和#import

 - (NSString *)deviceIPAdress {
    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;
}

• 当前手机连接的WIFI名称(SSID)
  需要#import

- (NSString *)getWifiName
{
    NSString *wifiName = nil;
    CFArrayRef wifiInterfaces = CNCopySupportedInterfaces();
    if (!wifiInterfaces) {
        return nil;
    }
    NSArray *interfaces = (__bridge NSArray *)wifiInterfaces;
    for (NSString *interfaceName in interfaces) {
        CFDictionaryRef dictRef = CNCopyCurrentNetworkInfo((__bridge CFStringRef)(interfaceName));
        if (dictRef) {
            NSDictionary *networkInfo = (__bridge NSDictionary *)dictRef;
            wifiName = [networkInfo objectForKey:(__bridge NSString *)kCNNetworkInfoKeySSID];
            CFRelease(dictRef);
        }
    }
    CFRelease(wifiInterfaces);
    return wifiName;
}