メモリ使用量（使用済み／残メモリ）取得（Swift)

Swiftで使用済みメモリ、残メモリ容量を取得する方法

        

func showMemoryInfo() {

    //使用済みメモリ

    var taskInfo = mach_task_basic_info()

    var count = mach_msg_type_number_t(MemoryLayout<mach_task_basic_info>.size)/4

    var ret: kern_return_t = withUnsafeMutablePointer(to: &taskInfo) {

        $0.withMemoryRebound(to: integer_t.self, capacity: 1) {

            task_info(mach_task_self_, task_flavor_t(MACH_TASK_BASIC_INFO), $0, &count)

        }

    }

    let usedMemory = (ret == KERN_SUCCESS ? taskInfo.resident_size as UInt64 : 0)

            

    //フリーメモリ

    var size: mach_msg_type_number_t =

        UInt32(MemoryLayout<vm_statistics64_data_t>.size / MemoryLayout<integer_t>.size) as mach_msg_type_number_t

    var vmStatInfo = vm_statistics64()

    ret = withUnsafeMutablePointer(to: &vmStatInfo) {

        $0.withMemoryRebound(to: integer_t.self, capacity: 1) {

            host_statistics64(mach_host_self(), host_flavor_t(HOST_VM_INFO64), $0, &size)

        }

    }

    let freeMemory = (ret == KERN_SUCCESS ? vmStatInfo.free_count * 
vm_kernel_page_size : 0)

            

    print("\(usedMemory), \(freeMemory)");

}