IOS中计算缓存文件的大小判断实例详解

//获取缓存文件路径
-(NSString *)getCachesPath{
  // 获取Caches目录路径
  NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask,YES);
  NSString *cachesDir = [paths objectAtIndex:0];
  
  NSString *filePath = [cachesDir stringByAppendingPathComponent:@"com.nickcheng.NCMusicEngine"];
  
  return filePath;
}
///计算缓存文件的大小的M
- (long long) fileSizeAtPath:(NSString*) filePath{
  NSFileManager* manager = [NSFileManager defaultManager];
  if ([manager fileExistsAtPath:filePath]){
    
//    //取得一个目录下得所有文件名
//    NSArray *files = [manager subpathsAtPath:filePath];
//    NSLog(@"files1111111%@ == %ld",files,files.count);
//    
//    // 从路径中获得完整的文件名（带后缀）
//    NSString *exe = [filePath lastPathComponent];
//    NSLog(@"exeexe ====%@",exe);
//    
//    // 获得文件名（不带后缀）
//    exe = [exe stringByDeletingPathExtension];
//    
//    // 获得文件名（不带后缀）
//    NSString *exestr = [[files objectAtIndex:1] stringByDeletingPathExtension];
//    NSLog(@"files2222222%@ ==== %@",[files objectAtIndex:1],exestr);
    
    
    return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];
  }
  
  return 0;
}
- (float ) folderSizeAtPath:(NSString*) folderPath{
  NSFileManager* manager = [NSFileManager defaultManager];
  if (![manager fileExistsAtPath:folderPath]) return 0;
  NSEnumerator *childFilesEnumerator = [[manager subpathsAtPath:folderPath] objectEnumerator];//从前向后枚举器／／／／//
  NSString* fileName;
  long long folderSize = 0;
  while ((fileName = [childFilesEnumerator nextObject]) != nil){
    NSLog(@"fileName ==== %@",fileName);
    NSString* fileAbsolutePath = [folderPath stringByAppendingPathComponent:fileName];
    NSLog(@"fileAbsolutePath ==== %@",fileAbsolutePath);
    folderSize += [self fileSizeAtPath:fileAbsolutePath];
  }
  NSLog(@"folderSize ==== %lld",folderSize);
  return folderSize/(1024.0*1024.0);
}
////////////
-(void)ss{
  // 获取Caches目录路径
  NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask,YES);
  NSString *cachesDir = [paths objectAtIndex:0];
  
  NSLog(@"cachesDircachesDir == %@",cachesDir);
  //读取缓存里面的具体单个文件/或全部文件//
  NSString *filePath = [cachesDir stringByAppendingPathComponent:@"com.nickcheng.NCMusicEngine"];
  NSArray *array = [[NSArray alloc]initWithContentsOfFile:filePath];
  NSLog(@"filePathfilePath%@ ==array==== %@",filePath, array);
  
  
  NSFileManager* fm=[NSFileManager defaultManager];
  if([fm fileExistsAtPath:filePath]){
    //取得一个目录下得所有文件名
    NSArray *files = [fm subpathsAtPath:filePath];
    NSLog(@"files1111111%@ == %ld",files,files.count);
    
    // 获得文件名（不带后缀）
    NSString * exestr = [[files objectAtIndex:1] stringByDeletingPathExtension];
    NSLog(@"files2222222%@ ==== %@",[files objectAtIndex:1],exestr);
  }

}