内存检测

1、引入头文件

#include <sys/sysctl.h>

#include <mach/mach.h>

2、检测函数

//MARK: 可用内存

- (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;

}





//MARK: 已使用内存

- (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;

}

3、输出内存状况：

每隔三秒输出一次内存使用情况：

NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:3 

                                             target:self 

                                           selector:@selector(onTimer:) 

                                           userInfo:nil 

                                            repeats:YES];

 



- (void)onTimer:(id)sender

{

     NSLog(@" 使用内存  %f  剩余内存  %f",[self usedMemory],[self availableMemory]);

}