iOS Code Snippet WebView "extra"

B4i didn't have WebView extra library (yet) so I collect the code from around the forum. Hope it's useful for you.

1. Hide scrollbar of WebView:

Dim no As NativeObject = WebView1
no.GetField("scrollView").SetField("showsHorizontalScrollIndicator", False)
no.GetField("scrollView").SetField("showsVerticalScrollIndicator", False)

2. Set background to transparent:

Dim no As NativeObject = WebView1
no.SetField("opaque", False)

3. Disable Scroll:

Dim no As NativeObject = WebView1
no.GetField("scrollView").SetField("scrollEnabled", False)

4. Go Back:

Sub GoBack(wv As WebView)
Dim no As NativeObject = wv
  If no.RunMethod("canGoBack", Null).AsBoolean = True Then
   no.RunMethod("goBack", Null)
  End If
End Sub

5. Clear Cache:

Dim no As NativeObject
no.Initialize("NSURLCache").RunMethod("sharedURLCache", null).RunMethod("removeAllCachedResponses", null)

I will update more.

 

[Erel]

Inject JavaScript:

Dim no As NativeObject = WebView1
Log(no.RunMethod("stringByEvaluatingJavaScriptFromString:", Array("your java script here"))

Use WebView.EvaluateJavaScript.

 

[moster67]

Snippet to obtain title of loaded webpage (corresponding to the getTitle method in the WebViewXtender-library in B4a).
This snippet requires that JavaScript is always enabled in UIWebView but apparently it cannot be turned off in iOS so this snippet should always work.

(Based upon Erel's example for injecting JavaScript)

Dim no As NativeObject = WebView1
Log(no.RunMethod("stringByEvaluatingJavaScriptFromString:", Array("document.title")))

 

[klarsys]

This is cool.

Is there any way to raise an app event from javascript?

 

[Erel]

You can handle the OverrideUrl event and then navigate to a different page in the JavaScript.

 

[ivan.tellez]

Hi!

Is there any equivalent to the "WebView.CaptureBitmap" in B4A?

Thanks

 

[Erel]

Yes. See this post: https://www.b4x.com/android/forum/t...eb-page-into-another-image.53072/#post-332601

 

[youjunjer]

Is there any method to detect page on loading, I need to make a msgbox to show "page on loading".
And if network or website is error or unavailable, I need to redirect to a local page.
Thank for a lot....

 

[Erel]

Please start a new thread for this question.

 

[joop]

Instead of full screen , inline media playing

A Boolean value that determines whether HTML5 videos play inline or use the native full-screen controller.


B4I code:

Dim no As NativeObject = WebView1
no.SetField("allowsInlineMediaPlayback", True)

And the HTML code :

<iframe webkit-playsinline width="200" height="200" src="https://www.youtube.com/embed/KKYTdhfwrAM?feature=player_detailpage&playsinline=1" frameborder="0"></iframe>

 

[Baris Karadeniz]

Hi, is it possible to get "Main" completely?

 

[Baris Karadeniz]

B4i didn't have WebView extra library (yet) so I collect the code from around the forum. Hope it's useful for you.

1. Hide scrollbar of WebView:

Dim no As NativeObject = WebView1
no.GetField("scrollView").SetField("showsHorizontalScrollIndicator", False)
no.GetField("scrollView").SetField("showsVerticalScrollIndicator", False)

2. Set background to transparent:

Dim no As NativeObject = WebView1
no.SetField("opaque", False)

3. Disable Scroll:

Dim no As NativeObject = WebView1
no.GetField("scrollView").SetField("scrollEnabled", False)

4. Go Back:

Sub GoBack(wv As WebView)
Dim no As NativeObject = wv
  If no.RunMethod("canGoBack", Null).AsBoolean = True Then
   no.RunMethod("goBack", Null)
  End If
End Sub

5. Clear Cache:

Dim no As NativeObject
no.Initialize("NSURLCache").RunMethod("sharedURLCache", null).RunMethod("removeAllCachedResponses", null)

I will update more.

Can please send Main?

 

[Erick Kalugdan]

In B4A there is a method "addJavascriptInterface" so that if I want to call an app Sub from the javascript inside the webview, I just call it via APP.CallSub

Does this exist in B4i too? How? Sample code would be greatly appreciated.

Thanks in advance!

 

[youjunjer]

what i use is to detect the webview's url.
for example, when webview load a url compete, it will do an event is load onPageFinished, so that you can do something when the url is what you need

 

[Erel]

Please post questions in the questions forum.