一、引入頭文件
#import <sys/sysctl.h>
#import <mach/mach.h>
#import <malloc/malloc.h>
二劝篷、實(shí)現(xiàn)方法
獲取當(dāng)前設(shè)備可用內(nèi)存(單位：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;
}
獲取當(dāng)前任務(wù)所占用的內(nèi)存（單位：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;
}
//獲取實(shí)例對(duì)象的成員變量所占用的內(nèi)存大小（單位：KB）
+ (double)usedMemoryWithObject:(NSObject *)object
{
return class_getInstanceSize([object class]) / 1024.0;
}
