Never ending loop while loading HTML in Web View - swift

Question

I try to load webView with existing website.
I added buttons on a navigation bar which have url links:
override func viewDidLoad() {
super.viewDidLoad()
webView.delegate = self
var myHTMLString = ""
guard let myURL = URL(string: domainURLString) else {
print("Error: \(domainURLString) doesn't seem to be a valid URL")
return
}
do {
myHTMLString = try String(contentsOf: myURL, encoding: .utf8)
} catch let error {
print("Error: \(error)")
}
webView.frame = view.bounds
webView.scalesPageToFit = true
createBottomNavigationBar()
webView.loadHTMLString(myHTMLString as String, baseURL: nil)
}
func webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebViewNavigationType) -> Bool {
print("===============================start===============================")
let myURLString:String = (request.url?.absoluteString)!
var myHTMLString = ""
if navigationType == UIWebViewNavigationType.linkClicked {
print("link clicked")
webView.stopLoading()
var myHTMLString = ""
let myURL = URL(string: myURLString)
do {
myHTMLString = try String(contentsOf: myURL!, encoding: .utf8)
} catch let error {
print("Error: \(error)")
return true
}
webView.loadHTMLString(myHTMLString as String, baseURL: nil)
print("first")
print(request.url)
}else if(navigationType == UIWebViewNavigationType.other){
print("This is for Navigation Button click")
//webView.loadHTMLString(myHTMLString as String, baseURL: nil)
}
else{
print("else")
}
return true
However, When I uncomment
webView.loadHTMLString(myHTMLString as String, baseURL: nil)
in this statement:
}else if(navigationType == UIWebViewNavigationType.other){
the app loops forever.
The statement is for when one of the navigation buttons click fires. It redirects to internal url like "http://yahoo.com/mail".

Answer 1

That would be the expected behaviour based on your code. The line
webView.loadHTMLString(myHTMLString as String, baseURL: nil)
in viewDidLoad will try to load the HTML. This in turn will call the delegate method
webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebViewNavigationType) -> Bool
Inside the delegate method, when your code hits the else if case, it will again call
webView.loadHTMLString(myHTMLString as String, baseURL: nil)
which in turn will call the delegate method again. It's a cyclical loop. The code is working as it should. You need to change the logic.