Loading a UIWebview when pressing a UIButton - ios

Question

I am developing a simple testing app for iPhone. I want to click a button to change the URL of webview, then load the new URL. Here is my code:
NSString *nurl = [NSString stringWithFormat: #"http://www.abc.com/abc.aspx?SN=%#&fdate=%#&tdate=%#", SNstr, fDate, tDate];
NSLog(#"################: %#", nurl);
NSURL *url = [NSURL URLWithString:nurl];
NSLog(#"################: %#", url);
NSURLRequest *req = [NSURLRequest requestWithURL:url];
[Logs loadRequest:req];
It is working well inside viewDidLoad.
I move it into a button:
-(IBAction)CheckLog:(id)sender
{
// codes here
}
When I press the button, it gives nurl's value correct, but url's value is null. So nothing is changed on the UIWebView Logs.
Why could this be, when the code runs correctly in viewDidLoad?

Answer 1

your button action will be like this...
-(IBAction)CheckLog:(id)sender
{
[[NSURLCache sharedURLCache] removeAllCachedResponses];
NSString *nurl = [NSString stringWithFormat: #"http://www.abc.com/abc.aspx?SN=%#&fdate=%#&tdate=%#", SNstr, fDate, tDate];
NSURL *url = [NSURL URLWithString: [nurl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding] ];
// NSURL *theURL = [NSURL URLWithString:#"https://www.google.co.in/"]; // Your new URL
[self.myWebView loadRequest:[NSURLRequest requestWithURL:url]];
}

Answer 2

The first thing to check is that the method is definitely being called. Are your NSLog statements being printed? If not, check that you have connected the button to the IBAction correctly in Interface Builder.
I can't see anything in your code that is immediately jumping out to me as incorrect, so your best bet is to set a breakpoint at the start of the method and step through it line-by-line, checking the values of each variable as you go.