Swift – UIWebView dynamic content size

swiftuiwebview

I've been looking around and wasnt able to see any swift related ways to do this. I'm trying to get my UIWebViews height to be dynamic. I have a UIWebView that loads data using the loadHtmlString function.The thing is that I am loading the data from an sqlite database, each time I load a different string with different length and naturally the web view obtains different height.
Now I need to know how to make the UIWebView that exact height in order to load my next content right under the webView. This is what I have so far

var jobSkillView = UIWebView(frame: CGRectMake(-5, 480.0, screenWidth, 300.0))
jobSkillView.loadHTMLString("<html><body p style='font-family:arial;font-size:16px;'>" + jobSkills + "</body></html>", baseURL: nil)
jobSkillView.stringByEvaluatingJavaScriptFromString("document.body.innerHTML")
jobSkillView.scrollView.scrollEnabled = true
jobSkillView.scrollView.bounces = true
jobSkillView.sizeToFit()
border.addSubview(jobSkillView)

I found something like this on SO but not sure how to link it to the UIWebView's frame:

func webViewDidFinishLoad(jobSkillView : UIWebView){
    // Change the height dynamically of the UIWebView to match the html content
    var jobSkillViewFrame: CGRect = jobSkillView.frame
    jobSkillViewFrame.size.height = 1
    jobSkillView.frame = jobSkillViewFrame
    var fittingSize: CGSize = (jobSkillView.sizeThatFits(CGSizeZero))
    jobSkillViewFrame.size = fittingSize
    // webViewFrame.size.width = 276; Making sure that the webView doesn't get wider than 276 px
    jobSkillView.frame = jobSkillViewFrame
    var jobSkillViewHeight = jobSkillView.frame.size.height
}

Best Answer

This post has been updated for Swift 5 & WKWebView

So this is a really great function you wrote there, OP!
Here is just a shorter, more elegant version of your code:

// make sure to declare the delegate when creating your webView (add UIWebViewDelegate to class declaration as well)
myWebView.delegate = self

func webViewDidFinishLoad(webView: UIWebView) {
     webView.frame.size.height = 1
     webView.frame.size = webView.sizeThatFits(CGSize.zero)
}

Migrating to WKWebView

1) import WebKit
2) make your ViewController inherit from WKNavigationDelegate
3) hook up the WKWebView’s delegate: webView.navigationDelegate = self
4) implement the following protocol function:

webView(_ webView: WKWebView, didFinish navigation: WKNavigation!)

After migrating from UIWebView to WKWebView, above approach doesn’t seem to work anymore.
What you can do instead, is change the line with webView.sizeThatFits(CGSize.zero) to:

webView.frame.size = webView.scrollView.contentSize

The full code for WKWebView would then be:

func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
    webView.frame.size.height = 1
    webView.frame.size = webView.scrollView.contentSize
}
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