iOS清除缓存

参考：http://www.open-open.com/lib/view/open1425625126743.html

-(float)fileSizeAtPath:(NSString *)path{

    NSFileManager *fileManager=[NSFileManagerdefaultManager];

    if([fileManager fileExistsAtPath:path]){

        long long size=[fileManagerattributesOfItemAtPath:path error:nil].fileSize;

        return size/1024.0/1024.0;

    }

    return 0;

}

-(float)folderSizeAtPath:(NSString *)path{

    NSFileManager *fileManager=[NSFileManagerdefaultManager];

    float folderSize;

    if ([fileManager fileExistsAtPath:path]) {

        NSArray *childerFiles=[fileManager subpathsAtPath:path];

        for (NSString *fileNamein childerFiles) {

            NSString *absolutePath=[path stringByAppendingPathComponent:fileName];

            folderSize +=[self fileSizeAtPath:absolutePath];

        }

        //SDWebImage框架自身计算缓存的实现

        folderSize+=[[SDImageCache sharedImageCache] getSize]/1024.0/1024.0;

        return folderSize;

    }

    return 0;

}

-(void)clearCache:(NSString *)path{

    NSFileManager *fileManager=[NSFileManagerdefaultManager];

    if ([fileManager fileExistsAtPath:path]) {

        NSArray *childerFiles=[fileManager subpathsAtPath:path];

        for (NSString *fileNamein childerFiles) {

           //如有需要，加入条件，过滤掉不想删除的文件

            NSString *absolutePath=[path stringByAppendingPathComponent:fileName];

            [fileManager removeItemAtPath:absolutePatherror:nil];

        }

    }

    [[SDImageCachesharedImageCache] cleanDisk];

}

NSString *cachPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES) objectAtIndex:0]; //获取的缓存文件夹路径