获取ios内存使用情况

//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_tkernReturn = 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;
}