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UIWebView dynamic content size

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北海茫月
北海茫月 2020-12-01 09:21

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

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9条回答
  • 故里飘歌
    2020-12-01 09:56

    When font change at that time change Webview height to 1 than get proper offsetHeight for Webview

    webView1.frame.size.height = 1
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  • 天命终不由人
    2020-12-01 09:57

    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()
    }

}
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  • 醉梦人生
    2020-12-01 10:05

    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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  • 借酒劲吻你
    2020-12-01 10:06

    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
}
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  • 萌比男神i
    2020-12-01 10:13

    Use the following code to make your UIWebView height dynamic in Swift 3.x

    func webViewDidFinishLoad(_ webView: UIWebView) {        

 let height = webView.scrollView.contentSize.height
 var wRect = webView.frame
 wRect.size.height = height
 webView.frame = wRect

}
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  • 天命终不由人
    2020-12-01 10:18

    Okay I figured out what I was doing wrong so now I know how to call this function. First of all I was supposed to call a UIWebViewDelegate in my class. Then set my var jobSkillView to (jobSkillView.delegate = self). Now this is where I made my major mistake. In my code I had a if else statement that I was throwing my func webViewDidLoad in. I was supposed to put it out of that statement and into the actual class to override my frame for the UIWebView. Speaking of frame **** DONT FORGET TO SET YOUR FRAME HEIGHT TO 1. Then and only then this function will work for your UIWebView. After that you should have a fully functional based height for your UIWebView for Swift.

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