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);}原文：http://blog.csdn.net/yangchen9931/article/details/44957787