方法1：获取webview中scrovllview的contentsize进行设置
-(void)webViewDidFinishLoad:(UIWebView *)webView{
CGFloat webViewHeight = [webView.scrollView contentSize].height;
CGRect newFrame = webView.frame;
newFrame.size.height = webViewHeight;
webView.frame = newFrame;
}
方法2：执行js语句 直接获取html文档的dom高度
-(void)webViewDidFinishLoad:(UIWebView *)webView{
CGFloat webViewHeight = [[webView stringByEvaluatingJavaScriptFromString:@"document.body.offsetHeight"] floatValue];
CGRect newFrame = webView.frame;
newFrame.size.height = webViewHeight;
webView.frame = newFrame;
}
方法3.先将UIWebView的高度设为最小，然后再使用sizeThatFits就会返回刚好合适的大小
-(void)webViewDidFinishLoad:(UIWebView *)webView{
CGSize actualSize = [webView sizeThatFits:CGSizeZero];
CGRect newFrame = webView.frame;
newFrame.size.height = actualSize.height;
webView.frame = newFrame;
}
方法4.遍历webview子视图 获取UIWebDocumentView高度即实际高度
-(void)webViewDidFinishLoad:(UIWebView *)webView{
CGFloat webViewHeight = 0.0f;
if ([webView.subviews count] > 0) {
UIView *scrollerView = webView.subviews[0];
if ([scrollerView.subviews count] > 0) {
UIView *webDocView = scrollerView.subviews.lastObject;
if ([webDocView isKindOfClass:[NSClassFromString(@"UIWebDocumentView") class]]) {
webViewHeight = webDocView.frame.size.height; //获取文档的高度
webView.frame = webDocView.frame; //更新UIWebView 的高度
}
}
}
}
原文：http://www.cnblogs.com/anyezhuixing/p/4866937.html