Question

我有一系列图片网址，我必须首先下载图片然后以滑动方式显示。但我想异步下载图像。我一次使用3张图片，如下面的代码所示：

var imageViewArray = [];
var nextImageIndex;
var imageNameArray=[];

for (var i = 0; i < 3; i++) {
var imageView1 = Titanium.UI.createImageView({
});
imageViewArray[i] = imageView1;
}

var scrollingView = Titanium.UI.createScrollableView({
views : imageViewArray,
width : 310,
height : 450,
top : 5,
left : 5,
borderWidth : 2,
borderColor : '#000'
 });

scrollingView.addEventListener('scroll', function(e) {
Ti.API.info("C=" + e.currentPage);
Ti.API.info("N=" + nextImageIndex);
if (e.currentPage == 2 && nextImageIndex < imageNameArray.length - 2) {
    //Setting the current page to 1 will allow the smooth swipe functionality
    scrollingView.currentPage = 1;
    nextImageIndex += 1;
    var vw = scrollingView.views[0];
    imageViewArray[0] = scrollingView.views[1];
    imageViewArray[1] = scrollingView.views[2];
    scrollingView.removeView[vw];
    vw.image = imageNameArray[nextImageIndex + 1];
    imageViewArray[2] = vw;
    scrollingView.views = imageViewArray;
} else if (e.currentPage == 0 && nextImageIndex > 1) {
    nextImageIndex -= 1;
    scrollingView.currentPage = 1;
    var vw = scrollingView.views[2];
    imageViewArray[1] = scrollingView.views[0];
    imageViewArray[2] = scrollingView.views[1];

    scrollingView.removeView[vw];

    vw.image = imageNameArray[nextImageIndex - 1];
    imageViewArray[0] = vw;
    scrollingView.views = imageViewArray;
}

  });

 scrollingView.views[0].image = imageNameArray[0];
  scrollingView.views[1].image = imageNameArray[1];
   scrollingView.views[2].image = imageNameArray[2];
  nextImageIndex = 1;

有谁能告诉我在哪里需要从网址下载图片。感谢

Answer 1

首先，在加载此视图时，首先下载至少3张图像。然后在滚动事件中，您将下载更多图像。

问：为什么要从滚动视图中删除视图？

从服务器下载图像并在滚动视图中显示它

1 个答案: