在UIWebView滚动时调用方法 [英] Calling a method when UIWebView scrolls

问题描述

我有一个包含大量文本内容的UIWebView。我需要能够在每次移动时获取UIWebView的位置。我正在使用此代码来说明问题：

I have a UIWebView that contains a lot of text content. I need to be able to get the location of the UIWebView every time it moves. I am using this code to get the point:

pageYOffset = [[webView stringByEvaluatingJavaScriptFromString:@"window.pageYOffset"] intValue];

现在我只需要这样做，以便每次UIWebView位置移动时更新此变量值，或者有任何滚动。是否可以在UIWebView滚动时调用方法？

now I just need to make it so that this variables value is updated everytime the UIWebView position moves, or there is any scrolling. Is it possible to call a method whenever the UIWebView scrolls?

推荐答案

您应该扩展UIWebView，如下所示

You should extend UIWebView, like below

@implementation UIWebView(CustomScroll)
- (void) scrollViewDidScroll:(UIScrollView *)scrollView{
    [self.delegate scrollViewDidScroll: scrollView];
}
@end

并在你的控制器上实现scrollViewDidScroll，如：

and implement scrollViewDidScroll on your controller like:

- (void) scrollViewDidScroll:(UIScrollView *)scrollView{
    NSLog("webview scrolled");
}

并且不要忘记将控制器设置为UIWebView的委托属性。

and don't forget to set your controller to the delegate property of UIWebView.

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