UIWebView 实现自适应高度

UIWebView加载本地html文件，要做到自适应高度，以满足视图其他控件对它的位置的依赖，比如webView 下面还有两个button, button的frame要根据webView的实际高度来计算，实现方法即可以调用webView代理方法， 有以下4种方法：

方法1：获取webview中scrovllview的contentsize进行设置
#pragma mark - webView Delegate

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

//capture the contentSize of WebView, and reset self.myWebView frame

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];

// CGFloat webViewHeight= [[webView stringByEvaluatingJavaScriptFromString:@"document.body.scrollHeight"]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

}

}

}

}