iOS 获取 当前设备 可用内存 及当前 应用 所占内存

// 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;

}