Question

Any idea how to call and send parameters to JS function from OBJ-C ??

Lets say in my html I have JS

function showPieChart (parameter1, parameter2) { … }

and from my obj c class in viewDidLoad I want to call this function. Any idea or examples ? Thanks in advance…

Answer 1

Add this in the webViewDidFinishLoad: of the UIWebViewDelegate:

NSString *functionCall = [NSString stringWithFormat:@"showPieChart(%@,%@)", param1, param2];
NSString *result = [webView stringByEvaluatingJavaScriptFromString:functionCall];

To set a view controller as delegate of a UIWebView, you have to add the <UIWebViewDelegate> protocol to the @interface header and link the delegate field of the UIWebView to the view controller.

If your parameters are inside an array, you can extract them one by one with [array objectForIndex:i] (i being the index for each parameter) or all at once with componentsJoinedByString:

NSArray *params = [NSArray arrayWithObjects:@"a",@"b",nil];
NSString *functionCall = [NSString stringWithFormat:@"showPieChart(%@)", [params componentsJoinedByString:@","]];