//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;
}
//获取当前任务所占的内存，单位：MB
-(double)usedMemory{
? ? task_basic_info_data_t taskInfo;
? ? mach_msg_type_number_t infoCount;
? ? 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);
}
