[IOS 开发] 获取当前设备可用内存及所占内存

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// 获取当前设备可用内存及所占内存的头文件#import <sys/sysctl.h>#import <mach/mach.h>// 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;}// 获取当前任务所占用的内存（单位：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;}
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