你应该能够使用Task_info和mach库中的mach_msg_type_number_t函数的组合来获得CPU使用率......至少AI是这么说的。：）
示例：

import Foundation
import mach

func getCPUUsage() -> Float {
    var kern: kern_return_t
    var task_info_count: mach_msg_type_number_t

    task_info_count = mach_msg_type_number_t(TASK_INFO_MAX)
    var tinfo = [integer_t](repeating: 0, count: Int(task_info_count))

    kern = task_info(mach_task_self_, task_flavor_t(TASK_BASIC_INFO), &tinfo, &task_info_count)
    if kern != KERN_SUCCESS {
        return -1
    }

    var taskInfo = task_basic_info()
    memcpy(&taskInfo, &tinfo, Int(task_info_count))

    let cpuUsage = Float(taskInfo.cpu_usage) / Float(TH_USAGE_SCALE * 100.0)

    return cpuUsage
}