Question

I have an application working on the following envirnoment:

• Monotouch 2.1
• MonoDevelop 2.4.2
• MacOS 10.6.8
• iOS SDK 4.3

The same application, migrated to iOS 5.0/5.1 and Monotouch 5.2.10 with MonoDevelop 2.8.8.4 under, has the following problem: When i click a button to navigate in a UIWebView do not work.

Code is that:(obviously it’s same in Monotouch 2.1)

public void ScrollToTop (object sender, EventArgs evt)
{
    webView.EvaluateJavascript("window.scrollTo(0,0)");
}

What could i do?

SOLVED (with Jonathan.Peppers help):

public void ScrollToTop (object sender, EventArgs evt)
{
    if((UIDevice.CurrentDevice.CheckVersion(5, 0)){                 
                System.Drawing.PointF p = new System.Drawing.PointF(0, 0);
                webView.ScrollView.SetContentOffset(p,true);
            }
            else{
                webView.EvaluateJavascript("window.scrollTo(0,0)");                 
            }
}

i have made in that way because on 4.3 webView.ScrollView.SetContentOffset make application crash.

Answer 1

Try this:

string error = webView.EvaluateJavascript("try { window.scrollTo(0,0); } catch (e) { return e.message; }");

(double check my code)

It should get you a better error message. Tell us the value of the string returned.

I suspect the issue isn’t MonoTouch, but perhaps iOS5? Safari had drastic changes in iOS5, new javascript engine, etc.