IOS中計算文件的大小

通常用于刪除緩存的時，計算緩存大小
//單個文件的大小
-
 (long
long)
 fileSizeAtPath:(NSString*) filePath{

NSFileManager*

manager = [NSFileManager defaultManager];

if


([manager fileExistsAtPath:filePath]){

    return


[[manager attributesOfItemAtPath:filePath error:nil] fileSize];

}

return


0;
}
//遍歷文件夾獲得文件夾大小，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);
}
</pre>