IOS中计算文件的大小

通常用于删除缓存的时，计算缓存大小//单个文件的大小- (long long) fileSizeAtPath:(NSString*) filePath{NSFileManager* manager = [NSFileManager defaultManager];if ([manager fileExistsAtPath:filePath]){return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];}return 0;}//遍历文件夹获得文件夹大小，返回多少M- (float ) folderSizeAtPath:(NSString*) folderPath{NSFileManager* manager = [NSFileManager defaultManager];if (![manager fileExistsAtPath:folderPath]) return 0;NSEnumerator *childFilesEnumerator = [[manager subpathsAtPath:folderPath] objectEnumerator];NSString* fileName;long long folderSize = 0;while ((fileName = [childFilesEnumerator nextObject]) != nil){NSString* fileAbsolutePath = [folderPath stringByAppendingPathComponent:fileName];folderSize += [self fileSizeAtPath:fileAbsolutePath];}return folderSize/(1024.0*1024.0);}

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