小编Jac*_*120的帖子

我正在尝试创建循环进度指示器.不幸的是,drawRect例程仅从setNeedsDisplay调用第一次和最后一次,它不会创建我正在寻找的渐进填充模式.我已经创建了一个UIView子类,我在其中填充背景,然后更新绘制进度,如下所示:

- (void)drawRect:(CGRect)rect
{
    // draw background
    CGFloat lineWidth = 5.f;
    UIBezierPath *processBackgroundPath = [UIBezierPath bezierPath];
    processBackgroundPath.lineWidth = lineWidth;
    processBackgroundPath.lineCapStyle = kCGLineCapRound;
    CGPoint center = CGPointMake(self.bounds.size.width / 2, self.bounds.size.width / 2);
    CGFloat radius = (self.bounds.size.width - lineWidth) / 2;
    CGFloat startAngle = (2 * (float)M_PI / 2); // 90 degrees
    CGFloat endAngle = (2 * (float)M_PI) + startAngle;
    [processBackgroundPath addArcWithCenter:center radius:radius startAngle:startAngle endAngle:endAngle clockwise:YES];
    [[UIColor grayColor] set];
    [processBackgroundPath stroke];

    // draw progress
    UIBezierPath *processPath = [UIBezierPath bezierPath];
    processPath.lineCapStyle = kCGLineCapRound; …

在我的项目中,我使用volley来下载一个JSON流,我将其解析并显示在列表视图中.我使用以下方法加载我的数据:

private void loadEventData(int year, final int month) {

    // get volley request queue
    requestQueue = cpcApplication.getRequestQueue(getActivity());

    String url = "****************?year=" + year
            + "&month=" + month;

    pd = ProgressDialog.show(getActivity(), "Loading Events", "Retrieving Data from Server");
    pd.setCancelable(true);

    JsonObjectRequest jr = new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {

        @Override
        public void onResponse(JSONObject response) {

            Log.i(TAG, response.toString());

            // parse the incoming response
            parseJson(response, month);

            // notify the listview that the data set has changed
            adapter.notifyDataSetChanged();

            // set the listview at the top …