-(float)fileSizeForDir:(NSString*)path//计算文件夹下文件的总大小{ NSFileManager *fileManager = [[NSFileManager alloc] init]; float size =0; NSArray* array = [fileManager contentsOfDirectoryAtPath:path error:nil]; for(int i = 0; i<[array count]; i++) { NSString *fullPath = [path stringByAppendingPathComponent:[array objectAtIndex:i]]; BOOL isDir; if ( !([fileManager fileExistsAtPath:fullPath isDirectory:&isDir] && isDir) ) { NSDictionary *fileAttributeDic=[fileManager attributesOfItemAtPath:fullPath error:nil]; size+= fileAttributeDic.fileSize/ 1024.0/1024.0; } else { [self fileSizeForDir:fullPath]; } } han = han + size; return size;}原文：http://www.cnblogs.com/zhanghuifeng/p/4760312.html