获取手机系统大小、可用空间大小,设备可用内存及当前应用所占内存等

设备可用内存及当前应用所占内存

// 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;  
}  

手机系统大小、可用空间大小

+(uint64_t)getFreeDiskspace {
    uint64_t totalSpace = 0.0f;
    uint64_t totalFreeSpace = 0.0f;
    NSError *error = nil;
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSDictionary *dictionary = [[NSFileManager defaultManager] attributesOfFileSystemForPath:[paths lastObject] error: &error];
    
    if (dictionary) {
        NSNumber *fileSystemSizeInBytes = [dictionary objectForKey: NSFileSystemSize];
        NSNumber *freeFileSystemSizeInBytes = [dictionary objectForKey:NSFileSystemFreeSize];
        totalSpace = [fileSystemSizeInBytes floatValue];
        totalFreeSpace = [freeFileSystemSizeInBytes floatValue];
        NSLog(@"Memory Capacity of %llu GB with %llu GB Free memory available.", ((totalSpace/1024ll)/1024ll/1024ll), ((totalFreeSpace/1024ll)/1024ll/1024ll));
    } else {
        NSLog(@"Error Obtaining System Memory Info: Domain = %@, Code = %d", [error domain], [error code]);
    }
    
    return totalFreeSpace;
}

其中

attributesOfFileSystemForPath:error:

返回的是一个字典。感兴趣的同学可用自己看下里面的其他信息