iOS 擷取 當前裝置 可用記憶體 及當前 應用 所佔記憶體

http://aasheaa.blog.163.com/blog/static/99333120126311332613/

// 擷取當前裝置可用記憶體及所佔記憶體的標頭檔#import <sys/sysctl.h>#import <mach/mach.h>  // 擷取當前裝置可用記憶體(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;}// 擷取當前任務所佔用的記憶體（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;}