import "UIDevice+Category.h"

import <sys/mount.h>

@implementation UIDevice (Category)

• (CGFloat)deviceGetBatteryQuantity {

  [UIDevice currentDevice].batteryMonitoringEnabled = YES;

  return ([[UIDevice currentDevice] batteryLevel]) * 100;
  }

• (long long)deviceGetTotalMemorySize {

  return [NSProcessInfo processInfo].physicalMemory;
  }

• (long long)deviceGetTotalDiskSize {
  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;
  }

• (long long)deviceGetAvailableDiskSize {
  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;
  }

/******************************/

import "ViewController.h"

import "UIDevice+Category.h"

@interface ViewController ()

@end

@implementation ViewController

• (void)viewDidLoad {
  [super viewDidLoad];

  CGFloat battery = [UIDevice deviceGetBatteryQuantity];

  long long memorySize = [UIDevice deviceGetTotalMemorySize];

  long long diskSize = [UIDevice deviceGetTotalDiskSize];

  long long availableDiskSize = [UIDevice deviceGetAvailableDiskSize];

  NSLog(@"\n battery:%f \n memorySize:%lld \n diskSize:%lld \n availableDiskSize:%lld ",battery,memorySize,diskSize,availableDiskSize);
  /**
  battery:100.000000
  memorySize:1048576000
  diskSize:12075704320
  availableDiskSize:3585474560
  */
  }

Demo https://github.com/550872569/UIDeviceCategory.git