iOS获取 当前设备 可用内存 及应用所占内存

获取当前设备可用内存及所占内存的头文件

#import<sys/sysctl.h> 
#import<mach/mach.h>

获取当前设备可用内存(单位：MB）

- (double)availableMemory
{
  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) / 1024.0) / 1024.0;
}

获取当前任务所占用的内存（单位：MB）

- (double)availableMemory
{
  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) / 1024.0) / 1024.0;
}