清理app应用程序的缓存

#define CacheDirectory [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES) objectAtIndex:0]//程序缓存目录

#pragma mark - 清理缓存

- (void)clearCache{

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,
0), ^{

        NSArray * files=[[NSFileManager
defaultManager] subpathsAtPath:CacheDirectory];

        for (NSString * p
in files) {

            NSError * error;

            NSString * path=[CacheDirectory
stringByAppendingPathComponent:p];

            if ([[NSFileManager
defaultManager] fileExistsAtPath:path]) {

                [[NSFileManager
defaultManager] removeItemAtPath:path
error:&error];

            }

        }

        [self
performSelectorOnMainThread:@selector(clearCacheSuccess)
withObject:nil
waitUntilDone:YES];

    });

}

//返回多少M

 float m=[self
folderSizeAtPath:CacheDirectory];

        cell.textLabel.text=[NSString
stringWithFormat:@"     %@                                        %.2fM",[moreArray
objectAtIndex:indexPath.row],m];

#pragma mark - 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);

}