Question

我有一个UIScrollView，里面有很多项，类似于facebook feed。在那个Feed中，我有一堆图像从互联网上加载。当图像被加载时，它们会淡入。问题是如果我滚动滚动视图，那么直到我的手指从滚动视图上抬起才会出现淡入的图像动画。有没有办法在滚动时更新UIScrollView视图的子视图？

-(void)loadStuff:(DipticView*)diptic{
    //DipticView is a UIView subclass that holds the imageview and some other information
    ConnectionManager *conman = [[ConnectionManager alloc] init];
    WebImage *webimage = [diptic.item.images firstObject]; //webimage holds the imageurl and the image

    [conman getImageWithURL:webimage.image_URL inBackgroundWithBlock:^(NSString *error, id image) {
        webimage.image = image;
        diptic.imageView.image = image;
        diptic.imageView.alpha = 0;
        diptic.userInteractionEnabled = NO;
        [UIView animateWithDuration:.4 animations:^{
            diptic.imageView.alpha = 1;
        } completion:^(BOOL finished) {
            diptic.userInteractionEnabled = YES;
        }];
        //The diptics are all subviews of the scrollview.
    }];
}

Answer 1

   dispatch_async(dispatch_get_main_queue(), ^{
    [UIView animateWithDuration:.4 animations:^{
        diptic.imageView.alpha = 1;
    } completion:^(BOOL finished) {
        diptic.userInteractionEnabled = YES;
    }];
});

但我不确定此方法是否可以与animateWithDuration一起使用。

滚动UIScrollView时动画不起作用

1 个答案: