Yes you can set the text for a textfield in the UIWebView using javascript
As an example if you have a textfield in this form
<input id="textFieldID" type="text" value="TextValue"/>
Setting value:
[theWebView stringByEvaluatingJavaScriptFromString:@"document.getElementById('textFieldID').value = 'Hello World'"]
Getting value:
NSString* value = [theWebView stringByEvaluatingJavaScriptFromString:@"document.getElementById('textFieldID').value"];
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