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)

#include <sys/sysctl.h>

#include <mach/mach.h>

- (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;

}

- (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)

#include <sys/sysctl.h>

#include <mach/mach.h>

- (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;

}