iOS - 获取目录中文件大小的总和 [英] iOS - Get sum of filesize in directory

问题描述

  NSURL * urlForPhoto = [FlickrFetcher urlForPhoto：self.photo格式：FlickrPhotoFormatLarge]; 
 NSString * rootPath = [NSSearchPathForDirectoriesInDomains（NSDocumentDirectory，NSUserDomainMask，YES）objectAtIndex：0]; 
 NSString * imagePath = [rootPath stringByAppendingString：[self.photo objectForKey：FLICKR_PHOTO_ID]]; 
 NSData * dataForPhoto; 
 NSError * error = nil; 
 if（[[NSFileManager defaultManager] fileExistsAtPath：imagePath]）{
 dataForPhoto = [NSData dataWithContentsOfFile：imagePath]; 
} else {
 dataForPhoto = [NSData dataWithContentsOfURL：urlForPhoto]; 
 [dataForPhoto writeToFile：imagePath atomically：YES]; 
} 
  

我想将此限制为10MB，然后如果达到限制，缓存中最旧的照片，如何获取我保存的所有文件的总大小，并检查哪个文件是最旧的？

解决方案

你可以得到这样一个文件的大小

  NSError * attributesError = nil; 
 
 NSDictionary * fileAttributes = [[NSFileManager defaultManager] attributesOfItemAtPath：URL error：& attributesError]; 
 
 int fileSize = [fileAttributes fileSize]; 
  

所以你可以遍历文件夹中的所有文件并添加文件大小...不知道如果这是一个直接的方式来获取目录大小，也是这个SO发表谈论这个aswell，你可以找到一个解决方案这里

要查找文件的创建日期，您可以执行

  NSString * path = @; 
 NSDictionary * fileAttribs = [[NSFileManager defaultManager] attributesOfItemAtPath：path error：nil]; 
 NSDate * result = [fileAttribs valueForKey：NSFileCreationDate]; //或NSFileModificationDate 
  

希望它有帮助

I have the following code I use to cache photos I load off Flickr in the device's memory:

NSURL *urlForPhoto = [FlickrFetcher urlForPhoto:self.photo format:FlickrPhotoFormatLarge];
NSString *rootPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *imagePath = [rootPath stringByAppendingString:[self.photo objectForKey:FLICKR_PHOTO_ID]];
NSData *dataForPhoto;
NSError *error = nil;
if ([[NSFileManager defaultManager] fileExistsAtPath:imagePath]) {
    dataForPhoto = [NSData dataWithContentsOfFile:imagePath];
} else {
    dataForPhoto = [NSData dataWithContentsOfURL:urlForPhoto];
    [dataForPhoto writeToFile:imagePath atomically:YES];
}

I want to limit this to 10MB and then if the limit is reached to remove the oldest photo in the cache, how can I get the total size of all the files I've saved and check which one is the oldest?

解决方案

You can get the size of a file like so

NSError *attributesError = nil;

    NSDictionary *fileAttributes = [[NSFileManager defaultManager] attributesOfItemAtPath:URL error:&attributesError];

    int fileSize = [fileAttributes fileSize];

So you can maybe iterate through all the files in the folder and add up the file sizes...not sure if theres a direct way to get the directory size, also theres this SO post talking about this aswell, you can find a solution here

To find the creation date of the file you can do

NSString *path = @"";
    NSDictionary* fileAttribs = [[NSFileManager defaultManager] attributesOfItemAtPath:path error:nil];
    NSDate *result = [fileAttribs valueForKey:NSFileCreationDate]; //or NSFileModificationDate

Hope it helps

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