获取iOS的内存信息

memory.m

#import <sys/sysctl.h>
#import <mach/mach.h>

+ (double)getAvailableMemory
{
    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;
}

+ (double)getUsingMemory
{
    task_basic_info_32_data_t taskInfo;
    mach_msg_type_number_t infoCount = TASK_BASIC_INFO_COUNT;
    kern_return_t kernReturn = task_info(mach_host_self(),
                                         TASK_BASIC_INFO,
                                         (task_info_t)&taskInfo,
                                         &infoCount);
    if(kernReturn != KERN_SUCCESS)
    {
        return NSNotFound;
    }

    return taskInfo.resident_size / 1024.0 / 1024.0;
}