Reader电子书阅读器优化实战(一)

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#pragma mark - - - - UIScrollViewDelegate - - - -
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{

    NSInteger index = scrollView.contentOffset.x/ scrollView.bounds.size.width;
    if (index == self.cellCount-1 || index == 0) {
        [self scrollToOriginCell];
    }
}

#pragma mark - - - - UICollectionViewDataSource - - - -
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath*)indexPath {

    JKPageCollectionCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:[JKPageCollectionCell CellIndentifier] forIndexPath:indexPath];
    [self refreshTheReadModelWithIndex:indexPath.item];
    NSInteger count = indexPath.item - self.middleIndex;
    if (count >= [self eyeProductCellCount]) {
        self.eyeProductView.backgroundColor = [LSYReadConfig shareInstance].theme;
        self.eyeProductView.hidden = NO;
    }

    self.lastPageIndex = indexPath.item;
    [cell updateViewWithModel:self.model];
    return cell;
}

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if (@available(iOS 10.0,*)) {
       self.collectionView.prefetchingEnabled = NO;
    }

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+(id)getLocalModelWithURL:(NSURL *)url
{
    NSString *key = [url.path lastPathComponent];
    NSData *data = [[NSUserDefaults standardUserDefaults] objectForKey:key];
    if (!data) {
        if ([[key pathExtension] isEqualToString:@"txt"]) {
            LSYReadModel *model = [[LSYReadModel alloc] initWithContent:[LSYReadUtilites encodeWithURL:url]];
            model.resource = url;
            [LSYReadModel updateLocalModel:model url:url];
            return model;
        }
        else if ([[key pathExtension] isEqualToString:@"epub"]){
            LSYReadModel *model = [[LSYReadModel alloc] initWithePub:url.path];
            model.resource = url;
            [LSYReadModel updateLocalModel:model url:url];
            return model;
        }
        else{
            @throw [NSException exceptionWithName:@"FileException" reason:@"文件格式错误" userInfo:nil];
        }

    }
    NSKeyedUnarchiver *unarchive = [[NSKeyedUnarchiver alloc]initForReadingWithData:data];
    //主线程操作
    LSYReadModel *model = [unarchive decodeObjectForKey:key];
    if ([[key pathExtension] isEqualToString:@"epub"]){
       model.chapters = [LSYReadUtilites ePubFileHandle:url.path];//重新从path下解析获取epubchapter的内容。
    }

    model.record.chapterModel = model.chapters.firstObject;
    return model;
}