1.参考自: http://blog.csdn.net/x1135768777/article/details/11158713
stackover:https://stackoverflow.com/questions/8223348/ios-get-cpu-usage-from-application （包含swift版）
2.源码
需导入头文件
#import <mach/mach.h>
- (float)cpu_usage { kern_return_t kr = { 0 }; task_info_data_t tinfo = { 0 }; mach_msg_type_number_t task_info_count = TASK_INFO_MAX; kr = task_info( mach_task_self(), TASK_BASIC_INFO, (task_info_t)tinfo, &task_info_count ); if ( KERN_SUCCESS != kr ) return 0.0f; task_basic_info_t basic_info = { 0 }; thread_array_t thread_list = { 0 }; mach_msg_type_number_t thread_count = { 0 }; thread_info_data_t thinfo = { 0 }; thread_basic_info_t basic_info_th = { 0 }; basic_info = (task_basic_info_t)tinfo; // get threads in the task kr = task_threads( mach_task_self(), &thread_list, &thread_count ); if ( KERN_SUCCESS != kr ) return 0.0f; long tot_sec = 0; long tot_usec = 0; float tot_cpu = 0; for ( int i = 0; i < thread_count; i++ ) { mach_msg_type_number_t thread_info_count = THREAD_INFO_MAX; kr = thread_info( thread_list[i], THREAD_BASIC_INFO, (thread_info_t)thinfo, &thread_info_count ); if ( KERN_SUCCESS != kr ) return 0.0f; basic_info_th = (thread_basic_info_t)thinfo; if ( 0 == (basic_info_th->flags & TH_FLAGS_IDLE) ) { tot_sec = tot_sec + basic_info_th->user_time.seconds + basic_info_th->system_time.seconds; tot_usec = tot_usec + basic_info_th->system_time.microseconds + basic_info_th->system_time.microseconds; tot_cpu = tot_cpu + basic_info_th->cpu_usage / (float)TH_USAGE_SCALE; } } kr = vm_deallocate( mach_task_self(), (vm_offset_t)thread_list, thread_count * sizeof(thread_t) ); if ( KERN_SUCCESS != kr ) return 0.0f; return tot_cpu; } 3.代码下载地址：
