Visual Studio Xamarin.iOS Xcode Objective-C - WKWebView implementation - objective-c

Question

I am currently trying to display a simple HTML-page within my iOS app used to control my smart mirror, which is supposed to display the current content displayed by the mirror. Unfortunately, I can't find any helpful tutorials online (only for the programming language Swift, which I am not allowed to use) and can't figure out how to properly implement WKWebView. If anyone could provide me with a useful tutorial or maybe even guide me through the steps, I would be very thankful!
EDIT: I've made some progress, however, the page won't load and will only display a white screen.
It is supposed to display a loading indicator (until the page is loaded), which is displayed for a fraction of a second before the screen turns white.
Here's my code:
"ThirdViewController.h":
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
#import <WebKit/WebKit.h>
#interface ThirdViewController : UIViewController <WKNavigationDelegate>
#property (strong, nonatomic) IBOutlet WKWebView *webView;
#property (strong, nonatomic) IBOutlet UIActivityIndicatorView *activityIndicator;
#end
"ThirdViewController.m":
#import "ThirdViewController.h"
#implementation ThirdViewController
#synthesize webView;
- (void) viewDidLoad {
[super viewDidLoad];
webView = [[WKWebView alloc] initWithFrame:[[self view] bounds]];
NSURL *url = [NSURL URLWithString:#"http://192.168.178.34:8080/"];
NSURLRequest *urlReq = [NSURLRequest requestWithURL:url];
[webView loadRequest:urlReq];
[self.view addSubview:webView];
}
- (void) webViewdidCommitNavigation:(WKNavigation *)navigation {
[self.activityIndicator startAnimating];
}
- (void) webViewdidFinishNavigation:(WKNavigation *)navigation {
[self.activityIndicator stopAnimating];
self.activityIndicator.hidesWhenStopped = YES;
}
#end
I have also added the following to Info.plist to allow for the use of non-https URLs:
<key>NSAppTransportSecurity</key>
<dict>
<key>NSAllowsArbitraryLoads</key>
<true/>
</dict>
Sincerely,
Lukas

Answer 1

If you want the same effect with the Objecive-C, you could have a try with following C# code:
public partial class ViewController : UIViewController
{
private readonly NSUrl url = new NSUrl("https://visualstudio.microsoft.com/xamarin/");
public UIActivityIndicatorView indicatorView;
protected ViewController(IntPtr handle) : base(handle) { }
partial void OpenWebView(UIButton sender)
{
indicatorView = new UIActivityIndicatorView(new CoreGraphics.CGRect(UIScreen.MainScreen.Bounds.Size.Width/2 - 25, UIScreen.MainScreen.Bounds.Size.Height/2 - 25, 25 ,25));
indicatorView.Hidden = true;
var webView = new WKWebView(View.Frame, new WKWebViewConfiguration());
View.AddSubview(webView);
View.AddSubview(indicatorView);
webView.NavigationDelegate = new CustomNavigationDelegate(this);
webView.LoadRequest(new NSUrlRequest(url));
}
partial void OpenSafari(UIButton sender)
{
UIApplication.SharedApplication.OpenUrl(url);
}
partial void OpenSafariViewController(UIButton sender)
{
var viewController = new SFSafariViewController(url);
PresentViewController(viewController, true, null);
}
}
internal class CustomNavigationDelegate : WKNavigationDelegate
{
private ViewController viewController;
public CustomNavigationDelegate(ViewController viewController)
{
this.viewController = viewController;
}
public override void DidCommitNavigation(WKWebView webView, WKNavigation navigation)
{
viewController.indicatorView.Hidden = true;
viewController.indicatorView.StartAnimating();
}
public override void DidFinishNavigation(WKWebView webView, WKNavigation navigation)
{
viewController.indicatorView.StopAnimating();
viewController.indicatorView.HidesWhenStopped = true;
}
}