oc 代码显示当前程序占用内存

#import <sys/sysctl.h>

#import <mach/mach.h>

UILabel *label;

- (void)usedMemory

{

    int64_tmemoryUsageInByte =0;

      task_vm_info_data_t vmInfo;

      mach_msg_type_number_t count = TASK_VM_INFO_COUNT;

      kern_return_tkernelReturn =task_info(mach_task_self(),TASK_VM_INFO, (task_info_t) &vmInfo, &count);

      if(kernelReturn ==KERN_SUCCESS) {

          memoryUsageInByte = (int64_t) vmInfo.phys_footprint;

          NSLog(@"Memory in use (in bytes): %lld", memoryUsageInByte);

      }else{

          NSLog(@"Error with task_info(): %s",mach_error_string(kernelReturn));

      }

    label.text= [NSStringstringWithFormat:@"memo: %lld", memoryUsageInByte/1024/1024];

  }