获取当前设备可用内存

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#import <sys/sysctl.h>#import <mach/mach.h>// 获取当前设备可用内存(单位：MB）double CommonUI::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 CommonUI::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;}

// 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;

}

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