Calling a method when UIWebView scrolls
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 开发者_StackOverflow中文版the point:
pageYOffset = [[webView stringByEvaluatingJavaScriptFromString:@"window.pageYOffset"] intValue];
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?
You should extend UIWebView, like below
@implementation UIWebView(CustomScroll)
- (void) scrollViewDidScroll:(UIScrollView *)scrollView{
[self.delegate scrollViewDidScroll: scrollView];
}
@end
and implement scrollViewDidScroll on your controller like:
- (void) scrollViewDidScroll:(UIScrollView *)scrollView{
NSLog("webview scrolled");
}
and don't forget to set your controller to the delegate property of UIWebView.
I believe that if your header lists your VC as a UIScrollViewDelegate, you can use the
-(void)scrollViewDidScroll:(UIScrollView *)scrollView
method to find out when it scrolls.
This is not correct. If you will use:
@implementation UIWebView(CustomScroll)
- (void) scrollViewDidScroll:(UIScrollView *)scrollView{
[self.delegate scrollViewDidScroll: scrollView];
}
@end
You will lose focus when try to enter data on page on iOS7 and more
You need to implement custom class for UIWevView and overwrite scrollViewDidScroll:
- (void) scrollViewDidScroll:(UIScrollView *)scrollView{
[super scrollViewDidScroll:scrollView];
[((id<UIScrollViewDelegate>)self.delegate) scrollViewDidScroll:scrollView];
}
if your requirement is to keep loading webview when user scrolls then you should paste your code into
- (void)webViewDidStartLoad:(UIWebView *)webView
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