ios准确获取webview的size

在webViewDidFinishLoad方法中实现

- (void)webViewDidFinishLoad:(UIWebView *)wb{

// 如果要获取webView内容高度必须在网页加载完成之后获取

self.webViewHeight = [[self.webView stringByEvaluatingJavaScriptFromString:@"document.body.offsetHeight"] floatValue];

//NSLog(@"------->:%f",self.webViewHeight);

self.webView.frame = CGRectMake(0, 0, Width,self.webViewHeight);

[(UIScrollView *)[[self.webView subviews] objectAtIndex:0] setBounces:NO];

[(UIScrollView *)[[self.webView subviews] objectAtIndex:0] setScrollEnabled:NO];

[self.tableView reloadData];

}

在webViewDidFinishLoad之后获取到网页内容高度的变化？

给webView的scrollView的contentSize属性添加监听，每当内容发生变化，contentSize一定会跟着变，捕获这个变动，在监听方法中实现webViewDidFinishLoad中的代码，也就是获取最新的内容高度赋给webView：

[self.webView.scrollView addObserver:self forKeyPath:@"contentSize" options:NSKeyValueObservingOptionNew context:nil];

//监听contentSize,获取web界面的size-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary*)change context:(void *)context

{

if ([keyPath isEqualToString:@"contentSize"]) {

CGSize webSize = [self.webView sizeThatFits:CGSizeZero];

//NSLog(@"----->:%f",webSize.height);

self.webViewHeight = webSize.height;

self.webView.frame = CGRectMake(0, 0, Width,self.webViewHeight);

[(UIScrollView *)[[self.webView subviews] objectAtIndex:0] setBounces:NO];

[(UIScrollView *)[[self.webView subviews] objectAtIndex:0] setScrollEnabled:NO];

[self.tableView reloadData];

}

}