UIWebView not loading a new url - ios

Question

Everytime I try to load another URL on a UIWebView i get the same error:
SendDelegateMessage(NSInvocation *): delegate (webView:decidePolicyForNavigationAction:request:frame:decisionListener:) failed to return after waiting 10 seconds.
My code about the webView is like:
#IBAction func changeUrl(sender: UIButton) {
if LEDON {
let urlStr = NSString(format: "%#/?Led=0", self.url)
let req = URLRequest(url: URL(string: urlStr as String)!)
webView.loadRequest(req)
while(webView.isLoading) {
sender.isEnabled = false
}
sender.isEnabled = true
LEDON = false;
} else {
let urlStr = NSString(format: "%#/?Led=1", self.url)
let req = URLRequest(url: URL(string: urlStr as String)!)
webView.loadRequest(req)
while(webView.isLoading) {
sender.isEnabled = false
}
sender.isEnabled = true
LEDON = true;
}
}
If I press the UIButton the first time the code works perfectly, but when I tap it again I get that error.
Where am I doing wrong?
"url" variable in the code is a global var and I already check that is correct.

Answer 1

Problem in
while(webView.isLoading) {
sender.isEnabled = false
}
You have frozen main thread and webView:decidePolicyForNavigationAction:request:frame:decisionListener: can't be invoke.
Try to use this:
func viewDidLoad()
{
...
webView.delegate = self;//UIWebView
//webView. navigationDelegate = self;//WKWebView
}
#IBAction func changeUrl(sender: UIButton) {
if LEDON {
let urlStr = NSString(format: "%#/?Led=0", self.url)
let req = URLRequest(url: URL(string: urlStr as String)!)
webView.loadRequest(req)
sender.isEnabled = false
LEDON = false;
} else {
let urlStr = NSString(format: "%#/?Led=1", self.url)
let req = URLRequest(url: URL(string: urlStr as String)!)
webView.loadRequest(req)
sender.isEnabled = false
LEDON = true;
}
}
For UIWebView you need to use
func webViewDidFinishLoad(UIWebView)
{
yourButton.isEnabled = true
}
For WKWebView
func webView(_ webView: WKWebView,
didFinish navigation: WKNavigation!)
{
yourButton.isEnabled = true
}
======================================
If you want use while loop try to change it for this:
while(webView.isLoading) {
sender.isEnabled = false
RunLoop.current.run(until: Date(timeIntervalSinceNow: 0.5))
}

Answer 2

You need to allow http and https on your app :
In your info.plist :
In Info.plist file add a dictionary with key 'NSAppTransportSecurity'
Add another element inside dictionary with key 'Allow Arbitrary Loads'