UIScrollView 的嵌套以及加载图片太多的问题

最近我遇到一个问题,在ios开发中做一个类似于手机相册的功能,具体内容如下:
1.有一个200/300百张的图片数组放在沙河中,做一个左右手动的轮播图,每张图都要可以实现缩放问题。
2.差不多已经实现了,就是利用scrollView的嵌套,由于加载是一张张的,导致首次在滚动的过程中会出现空白。
主要代码如下:
//结束减速

  • (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView { if (scrollView == self.sv) { int index = scrollView.contentOffset.x / scrollView.frame.size.width; NSString *filePath = [fileDestination stringByAppendingString:@"/images"]; NSString *imagePath =[NSString stringWithFormat:@"/%@/%@",filePath,self.imageArr[index]]; UIImageView *imv = [self.imageViews objectAtIndex:index]; imv.image = [UIImage imageWithContentsOfFile:imagePath]; } }
  • (UIScrollView *)sv {
    if(_sv == nil) {
    _scrollViews = [[NSMutableArray alloc] init];
    _imageViews = [[NSMutableArray alloc]init];

    _sv = [[UIScrollView alloc] initWithFrame:(CGRectMake(0, 64, KScrollViewWidth,  KScrollViewHeight - 128))];
    _sv.contentSize = CGSizeMake(KScrollViewWidth * self.imageArr.count, KScrollViewHeight - 128);
    _sv.delegate = self;
    CGFloat x = self.index * KScrollViewWidth;
    _sv.contentOffset = CGPointMake(x, 0);
    _sv.pagingEnabled = YES;
    //_sv是横向滚动的股东栏
    [self.view addSubview:_sv];
    for (int i = 0; i < self.imageArr.count; i ++) {
        UIScrollView * scrollView = [[UIScrollView alloc] initWithFrame:(CGRectMake(KScrollViewWidth * i, 0, KScrollViewWidth, KScrollViewHeight - 128))];
        scrollView.minimumZoomScale = 1;
        scrollView.maximumZoomScale = 10;
        [_sv addSubview:scrollView];
        scrollView.delegate = self;
        UIImageView *iv = [[UIImageView alloc] initWithFrame:(CGRectMake(0, 0, KScrollViewWidth, KScrollViewHeight - 128))];
        NSString *filePath = [fileDestination stringByAppendingString:@"/images"];
         [iv setImage:[UIImage imageNamed:@"789.png"]];
        if (self.index == i) {
            NSString *imagePath =[NSString stringWithFormat:@"/%@/%@",filePath,self.imageArr[i]];
            iv.image = [UIImage imageWithContentsOfFile:imagePath];
        }
    
        self.icon = iv;
        iv.contentMode = UIViewContentModeScaleAspectFit;
        [scrollView addSubview:iv];
        iv.tag = 1000;
        [self.imageViews addObject:iv];
        [self.scrollViews addObject:scrollView];
    }
    

    }
    return _sv;
    }
    在这里我添加了一张默认的图片,但是在使用的时候还是很别扭,哪位大神帮帮忙呀?

1个回答

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