Question

I have been battling a problem now for about a week and it’s really annoying me. I have embedded html into a uiwebview in Xcode and i want to launch the my javascript function of

ZoomChanger(Enter Value Here)

based on the value of UIslider. I tried this code…

NSString *string = [NSString stringWithFormat:@"ZoomChanger(100,200,300);", slider.value];
[webView stringByEvaluatingJavaScriptFromString:string];

but it only zooms in once and doesn’t continue zooming and won’t unzoom when uislider is brought back to the beginning. It works fine on android but I can’t get it to work on iOS.

Answer 1

You are sending ZoomChanger(100,200,300); each time.
I believe you want to send a value from the slider.
What is ZoomChanger? I assume it is a javascript function function ZoomChanger(x)….

You will need something like:

NSString *string = [NSString stringWithFormat:@"ZoomChanger(%d);", slider.value * 10]; 
[webView stringByEvaluatingJavaScriptFromString:string];

See this doc.