まとまった記事が意外となかったので。

宣言

MyWebView.h

# import <UIKit/UIKit.h>
# import <WebKit/WebKit.h>

@interface MyWebView : UIView <WKNavigationDelegate, WKUIDelegate>
@property (strong) WKWebView *webView;
@end

初期化

MyWebView.m

_webView = [[WKWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 568)];
_webView.navigationDelegate = self;
_webView.UIDelegate = self;
[self addSubview:_webView];

ロード

MyWebView.m

[_webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:url]]];

進む、戻る、リロード

MyWebView.m

[_webView canGoBack];
[_webView canGoForward];
[_webView reload];
[_webView goForward];
[_webView goBack];

デリゲート

shouldStartLoadWithRequest

MyWebView.m

- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation;

didStartLoad

MyWebView.m

- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation;

didFinishLoad

MyWebView.m

- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation;

didFailWithError

MyWebView.m

- (void)webView:(WKWebView *)webView didFailNavigation:(WKNavigation *)navigation withError:(NSError *)error;

Basic認証

UIAlertControllerWrapperはUIAlertControllerをラップしたクラスです。
こちらを参考に作りました。

MyWebView.m

- (void)webView:(WKWebView *)webView didReceiveAuthenticationChallenge:(nonnull NSURLAuthenticationChallenge *)challenge completionHandler:(nonnull void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential * _Nullable))completionHandler {
    if([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodHTTPBasic] == YES){ 
        NSLog(@"didReceiveAuthenticationChallenge");

        [UIAlertControllerWrapper showAlertViewWithIdAndPassword:@"Authentication" message:@"Input username and password." ok:^(UIAlertAction *action, UIAlertController *cntr){
            NSURLCredential *credential = [NSURLCredential credentialWithUser:[cntr.textFields objectAtIndex:0].text password:[cntr.textFields objectAtIndex:1].text persistence:NSURLCredentialPersistenceForSession];
            completionHandler(NSURLSessionAuthChallengeUseCredential, credential);
        
        }cancel:^(UIAlertAction *cancel){
            completionHandler(NSURLSessionAuthChallengeCancelAuthenticationChallenge, nil);
        }];
    }else{
        completionHandler(NSURLSessionAuthChallengeRejectProtectionSpace, nil);
    }
}

Javascript実行

MyWebView.m

[webView evaluateJavaScript:@"document.title"
          completionHandler:^(NSString *result, NSError *error){
}];