UIWebView dynamic content size
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
}
Solution 1:
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
}
Solution 2:
this only worked for me
func webViewDidFinishLoad(_ webView: UIWebView) {
webView.frame.size.height = 1
webView.frame.size = webView.sizeThatFits(.zero)
webView.scrollView.isScrollEnabled=false;
myWebViewHeightConstraint.constant = webView.scrollView.contentSize.height
webView.scalesPageToFit = true
}
make sure you've created an outlet for myWebViewHeightConstraint
Solution 3:
Here is my custom class to work with custom UIWebViews, it has everything in it to get the correct scrollview content height, set UIWebView height and create a custom height constraint to get autolayout working. It also loads some custom CSS styling...
class CustomUIWebView: UIWebView, UIWebViewDelegate {
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
self.scrollView.scrollEnabled = false
self.scrollView.bounces = false
self.delegate = self
}
override init(frame: CGRect) {
super.init(frame: frame)
self.scrollView.scrollEnabled = false
self.scrollView.bounces = false
self.delegate = self
}
override func loadHTMLString(string: String!, baseURL: NSURL!) {
var cssURL:String = NSBundle.mainBundle().pathForResource("webview", ofType: "css")!
var s:String = "<html><head><title></title><meta name=\"viewport\" content=\"initial-scale=1, user-scalable=no, width=device-width\" /><link rel=\"stylesheet\" href=\"./webview.css\" ></link></head><body>"+string+"</body></html>";
var url:NSURL
if baseURL == nil {
url = NSBundle.mainBundle().bundleURL
} else {
url = baseURL
}
super.loadHTMLString(s, baseURL: url)
}
func webViewDidFinishLoad(webView: UIWebView) {
self.webViewResizeToContent(webView)
}
func webViewResizeToContent(webView: UIWebView) {
webView.layoutSubviews()
// Set to smallest rect value
var frame:CGRect = webView.frame
frame.size.height = 1.0
webView.frame = frame
var height:CGFloat = webView.scrollView.contentSize.height
println("UIWebView.height: \(height)")
webView.setHeight(height: height)
let heightConstraint = NSLayoutConstraint(item: webView, attribute: NSLayoutAttribute.Height, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.Height, multiplier: 1.0, constant: height)
webView.addConstraint(heightConstraint)
// Set layout flag
webView.window?.setNeedsUpdateConstraints()
webView.window?.setNeedsLayout()
}
}
Solution 4:
I had problem with:
let height = webView.scrollView.contentSize.height
Sometimes my web view height simply didn't calculacte and stayed on default value. So finally I manage to find better solution that works fine, just replace that line code with:
let height = webView.stringByEvaluatingJavaScript(from: "document.body.scrollHeight")
This is mine final complete code:
func webViewDidFinishLoad(_ webView: UIWebView) {
//webview height
webView.frame.size.height = 1
webView.frame.size = webView.sizeThatFits(.zero)
webView.scrollView.isScrollEnabled = false
let height = webView.stringByEvaluatingJavaScript(from: "document.body.scrollHeight")
if let height = height {
if let heightInt = Int(height) {
let heightFloat = Float(heightInt)
webViewHeightConstraint.constant = CGFloat(heightFloat)
}
}
webView.scalesPageToFit = true
}
Solution 5:
I'm using HTML string in my load and have to use the following method in Webview delegate:
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
webView.evaluateJavaScript("document.documentElement.scrollHeight", completionHandler: { (height, error) in
self.webviewHeightConstraint?.constant = height as! CGFloat
})
}
and the full code:
import UIKit
import WebKit
class ViewController: UIViewController, WKNavigationDelegate {
@IBOutlet weak var webviewHeightConstraint: NSLayoutConstraint!
@IBOutlet weak var webview: WKWebView!
var observing = false
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
webview.navigationDelegate = self
webview.scrollView.isScrollEnabled = false
self.webview.loadHTMLString("""
<html>
<head>
<style>
ul {
list-style: none;
}
ul li::before {
content: "\\2022";
color: red;
font-weight: bold;
display: inline-block;
width: 1em;
margin-left: -1em;
}
</style>
</head>
<body>
<h2>Change Bullet Color of List Items</h2>
<ul>
<li>Adele</li>
<li>Agnes</li>
<li>Billy</li>
<li>Bob</li>
<li>Bob</li>
<li>Bob</li>
<li>Bob</li>
<li>Bob</li>
<li>Bob</li>
<li>Bob</li>
<li>Bob</li>
<li>Bob</li>
<li>Bob</li>
<li>Bob</li>
</ul>
</body>
</html>
""", baseURL: nil)
}
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
webView.evaluateJavaScript("document.documentElement.scrollHeight", completionHandler: { (height, error) in
self.webviewHeightConstraint?.constant = height as! CGFloat
})
}
}