ios memory info

ios_memory.m

// 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)usedMemory  
{  
  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 / 1024.0 / 1024.0;  
}