//获取当前设备可用内存及所占内存的头文件#import

#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_tvmStats;

     mach_msg_type_number_tinfoCount =HOST_VM_INFO_COUNT;

     kern_return_tkernReturn =host_statistics(mach_host_self(), 

    HOST_VM_INFO,

    (host_info_t)&vmStats,

                                             &infoCount);

    if(kernReturn !=KERN_SUCCESS) {

       returnNSNotFound;

  }

    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_ttaskInfo;

 mach_msg_type_number_tinfoCount =TASK_BASIC_INFO_COUNT;

kern_return_tkernReturn =task_info(mach_task_self(),

TASK_BASIC_INFO,

(task_info_t)&taskInfo,

                                       &infoCount);

if(kernReturn !=KERN_SUCCESS

      ) {

   returnNSNotFound;

  }

returntaskInfo.resident_size/1024.0/1024.0;

}