iOS清除缓存

 

 

#pragma mark === 暂时不用清除缓存=====
-(void)myClearCacheAction{
    dispatch_async(
                   dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
                   , ^{
                       NSString *cachPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0];

                       NSArray *files = [[NSFileManager defaultManager] subpathsAtPath:cachPath];
                       NSLog(@"files :%lu",(unsigned long)[files count]);
                       for (NSString *p in files) {
                           NSError *error;
                           NSString *path = [cachPath stringByAppendingPathComponent:p];
                           if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {
                               [[NSFileManager defaultManager] removeItemAtPath:path error:&error];
                           }
                       }
                       [self performSelectorOnMainThread:@selector(clearCacheSuccess) withObject:nil waitUntilDone:YES];});
}


-(void)clearCacheSuccess
{
    NSLog(@"清理成功");

}



//获取缓存大小。。
CGFloat fileSize = [self folderSizeAtPath:cachePath];

        dispatch_async(dispatch_get_main_queue(), ^{
            cache.subtitle = [NSString stringWithFormat:@"%.2fMB",fileSize];
            [self.tableView reloadData];

        });


- (CGFloat)folderSizeAtPath:(NSString *)folderPath
{
    NSFileManager *manager = [NSFileManagerdefaultManager];
    if (![manager fileExistsAtPath:folderPath]) {
        return 0;
    }

    NSEnumerator *childFilesEnumerator = [[manager subpathsAtPath:folderPath] objectEnumerator];

    NSString *fileName = nil;
    long long folderSize = 0;
    while ((fileName = [childFilesEnumerator nextObject]) != nil) {
        NSString *fileAbsolutePath = [folderPath stringByAppendingPathComponent:fileName];
        folderSize += [self fileSizeAtPath:fileAbsolutePath];
    }
    return folderSize/(1024.0*1024.0);
}

- (long long)fileSizeAtPath:(NSString *)filePath
{
    NSFileManager* manager = [NSFileManagerdefaultManager];
    if ([manager fileExistsAtPath:filePath]){
        return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];
    }
    return 0;

}