Desire result

Let’s take a look on the output above, the Event Description content.
Yes, it can achieved by using UILabel, but somehow HTML would be easy
to construct the format. Thus I’m showing a demo on how to use UIWebView
to achieve this.

This is using auto-layout

Add constraint

(I assumed that you know how to add constraint through storyboard)

Add constraint to UIWebView

Now add 4 or 5 constraints to UIWebView, make sure the Height constraint is added, you can put any value you like.

Set UIWebViewDelegate to self

ViewController.swift

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class ViewController: UIViewController, UIWebViewDelegate {
    // ...
}

Go back the storyboard, hold the right-click and drag it over to the controller

drag to delegate

Disable scroll, format subview

Here to disable the scroll, hide the scroll indicator, disable bounces,
clear the UIWebView background

ViewController.swift

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self.descriptionWebView.scrollView.scrollEnabled = false
self.descriptionWebView.scrollView.bounces = false
self.descriptionWebView.scrollView.showsHorizontalScrollIndicator = false
self.descriptionWebView.scrollView.showsVerticalScrollIndicator = false
for subview in self.descriptionWebView.subviews {
    if subview.isKindOfClass(UIScrollView) {
        for shadowView in subview.subviews {
            if shadowView.isKindOfClass(UIImageView) {
                (shadowView as UIView).hidden = true
            }
        }
    }
}

Add content & update height

Add a wrapper to the content (use main-wrapper here)

ViewController.swift

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self.descriptionWebView.loadHTMLString("<div id='main-wrapper'>\(html)</div>", baseURL: nil)

Implement the UIWebViewDelegate

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func webViewDidFinishLoad(webView: UIWebView) {
    if let output = webView.stringByEvaluatingJavaScriptFromString("document.getElementById(\"main-wrapper\").offsetHeight;") {
        
        if let height = output.toDouble() {
            println("webView content height \(height)")
            println("webview constraint before \(webView.constraints())")

            let heightConstraint = webView.constraints()[0] as NSLayoutConstraint
            // here is to update the height of UIWebView
            heightConstraint.constant = CGFloat(height)
            
            println("webview constraint after \(webView.constraints())")
        }
    }
}

The output would be

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webView content height 187.0
webview constraint before [<NSLayoutConstraint:0x786d49f0 V:[UIWebView:0x786d51e0(30)]>]
webview constraint after [<NSLayoutConstraint:0x786d49f0 V:[UIWebView:0x786d51e0(187)]>]

The UIWebView constraints here has only 1, thus I assumed that the first
constraint is the Height constraint, by changing the value of the first
constraint, the height of UIWebView will be changed.

Now, if you want user to open safari when they click on the link, implement
another method

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func webView(webView: UIWebView, shouldStartLoadWithRequest request: NSURLRequest, navigationType: UIWebViewNavigationType) -> Bool {
    if navigationType == .LinkClicked {
        UIApplication.sharedApplication().openURL(request.URL)
        return false
    }
    return true
}

Completed

Make sure the UIWebView is inside UIScrollView. As by using auto-layout,
the UIScrollView content height will be expand based on its subviews.