ios webview自适应实际内容高度4种方法
有的时候会碰见类似的苦逼需求， webview自适应实际内容高度 下面有四种方法供使用
方法1：获取webview中scrovllview的contentsize进行设置
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-(void)webViewDidFinishLoad:(UIWebView *)webView{
CGFloat webViewHeight=[webView.scrollView contentSize].height;
CGRect newFrame = webView.frame;
newFrame.size.height = webViewHeight;
webView.frame = newFrame;
}
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方法2：执行js语句 直接获取html文档的dom高度
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-(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;
}
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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
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-(void)webViewDidFinishLoad:(UIWebView *)webView{
CGSize actualSize = [webView sizeThatFits:CGSizeZero];
CGRect newFrame = webView.frame;
newFrame.size.height = actualSize.height;
webView.frame = newFrame;
}
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方法4.遍历webview子视图 获取UIWebDocumentView高度即实际高度
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-(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
}
}
}
}
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