获取当前任务所占的内存：

#include 
     
      #include 
      
     

// 任务占用内存double usedMemory(){#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)    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 0;    }    return taskInfo.resident_size / 1024.0 / 1024.0;#else    return 0;#endif}

当前设备可用内存：

#include 
     
      #include 
      
       - (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;}
      
     

《注》http://blog.csdn.net/zaitianaoxiang/article/details/6859628 （转）