CODEWITHSUNDEEP
iosswiftuiscrollviewuiwebview
Bierbarbar
Bierbarbar

Reputation: 1479

Swift UIWebView initial zoom scale

Hey i asked similar question some Days ago but no on could help me and no i'm think im closer to the problem. I have an WebView on my rootViewController and saved some Values for zoom scale and position of an local PDF, now i want set the Webview to this values when it appears so i tried the following.

   override func viewDidAppear(animated: Bool) {

    doLayoutThings()


}
    func doLayoutThings(){

    if(defaults.objectForKey("positionY") != nil){


        WebView.scrollView.setZoomScale(defaults.objectForKey("zoomlevel") as! CGFloat, animated: false)
        let offest = CGPoint(x: defaults.objectForKey("positionX") as! CGFloat, y: defaults.objectForKey("positionY") as! CGFloat)
        WebView.scrollView.setContentOffset(offest, animated:false)
        println(defaults.objectForKey("zoomlevel") as! CGFloat)




    }

I know that there are the correct values are saved to UserDefaults but the Webview looks if i didn't make any scrolling or zooming. I'm really happy about any solution Ideas.

Upvotes: 0

Views: 4080

Answers (2)

Hari Narayanan
Hari Narayanan

Reputation: 774

I am used this link to resolved this issue

In Swift

Initially i am try to change the web view zoom scale but it was not so working fine . 

webview.scrollView.setZoomScale(1.5, animated: true)

so i try to change it in webViewDidFinishLoad

func webViewDidFinishLoad(_ webView: UIWebView) {
    webview.scalesPageToFit = true

    let str = "var meta = document.createElement('meta');"
    let str1 = "meta.setAttribute( 'name', 'viewport' ); "
    let str2 = "meta.setAttribute( 'content', 'width = device-width, initial-scale = 1.0, user-scalable = yes' ); "
    let str3 = "document.getElementsByTagName('head')[0].appendChild(meta)"

    webview.stringByEvaluatingJavaScript(from: "\(str)\(str1)\(str2)\(str3)")

}

if you need to change the zoom level, change the "initial-scale" to see the effect of initial level zooming. It's really helpful for me. Thanks "UIWebView set initial zoom scale programmatically when loading an external website?"

Upvotes: 1

joern
joern

Reputation: 27620

Setting the zoom scale in viewDidAppear is fine but you cannot set the contentOffset before the web view has loaded its content. So you have to set a delegate on the UIWebView and then set the contentOffset in the delegate method:

override func viewDidLoad() {
   webView.delegate = self
}

func webViewDidFinishLoad(webView: UIWebView) {
    let offset = CGPoint(x: defaults.objectForKey("positionX") as! CGFloat, y: defaults.objectForKey("positionY") as! CGFloat)
    webView.scrollView.setContentOffset(offset, animated: false)
}

Upvotes: 0

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