检测我何时在页面顶部滚动 UIWebView-移动开发问题

Detect when I scroll my UIWebView at top of the page(检测我何时在页面顶部滚动 UIWebView)

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问题描述

我想在我的 webview 顶部添加一个 URL/google 栏，并像 Safari 一样通过向上滚动我的网页来访问它.为此，我会检测用户何时滚动页面，以及何时滚动到达顶部.

I would like to add an URL/google bar on top of my webview, and access it by scrolling up my web page exactly as Safari do. To do this, I would detect when the user is scrolling the page, and more over when the scroll reaches the top.

但我真的不知道怎么做.

But I really don't know how.

一个想法?非常感谢.

马丁

推荐答案

我也在挖掘同样的问题并找到了解决方案.我编写了以下方法来检测滚动坐标.见下文:

I was also digging for the same and found a solution. I coded the following method to detect the scrolling coordinates. See below:

-(void)userDidScrollWebView:(id)scrollPoint{
    // NSLog(@"scrolled:::");

    NSString *x1 = [webView stringByEvaluatingJavaScriptFromString: @"scrollX"];


    NSString *y1 = [webView stringByEvaluatingJavaScriptFromString: @"scrollY"];


    NSLog(@"scroll x=%@ y=%@", x1,y1);      

    if ([y1 isEqualToString: @"0"]) {
        NSLog(@"RELAOD ME");
    }   
}

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