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NSInternalInconsistencyException：webView：decidePolicyForNavigationAction：decisionHandlerが呼び出されませんでした

WkWebView内のリンクの読み込みを無効にしようとしているので、これにdecidePolicyForNavigationActionを使用していますが、アプリで次のエラーが発生します。

キャッチされなかった例外のためにアプリを終了します 'NSInternalInconsistencyException'理由： '完了ハンドラーが-[ViewControllerwebView：decidePolicyForNavigationAction：decisionHandler：]に渡されませんでした'

これは私にこのエラーを与える単純化されたコードです：

import UIKit
import WebKit

class ViewController: UIViewController, WKNavigationDelegate {

    var webView: WKWebView

    required init?(coder aDecoder: NSCoder) {
        let config = WKWebViewConfiguration()
        self.webView = WKWebView(frame: CGRectZero, configuration: config)
        super.init(coder: aDecoder)
        self.webView.navigationDelegate = self
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        view.insertSubview(webView, atIndex: 1)
        webView.translatesAutoresizingMaskIntoConstraints = false
        let height = NSLayoutConstraint(item: webView, attribute: .Height, relatedBy: .Equal, toItem: view, attribute: .Height, multiplier: 1, constant: -44)
        let width = NSLayoutConstraint(item: webView, attribute: .Width, relatedBy: .Equal, toItem: view, attribute: .Width, multiplier: 1, constant: 0)
        view.addConstraints([height, width])


        webView.loadRequest(NSURLRequest(URL:NSURL(string:"https://www.Apple.com")!))


    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func webView(webView: WKWebView, decidePolicyForNavigationAction navigationAction: WKNavigationAction, decisionHandler: ((WKNavigationActionPolicy) -> Void)) {

        if (navigationAction.navigationType == WKNavigationType.LinkActivated){
            print(navigationAction.request.URL?.relativeString)
            decisionHandler(WKNavigationActionPolicy.Cancel)
        }
    }
}
iosswiftwebviewwkwebview
10
jackbravo

ケースごとにdecisionHanlerを呼び出す必要があります。

func webView(webView: WKWebView, decidePolicyForNavigationAction navigationAction: WKNavigationAction, decisionHandler: ((WKNavigationActionPolicy) -> Void)) {
    if (navigationAction.navigationType == .linkActivated){
        decisionHandler(.cancel)
    } else {
        decisionHandler(.allow)
    }
}
21
Onato

つまり、decidePolicyForNavigationActionを呼び出す場合、一度に呼び出すことができるのはdecisionHandler(XX)のみです。それ以外の場合、アプリNSInternalInconsistencyException: webView:decidePolicyForNavigationAction:decisionHandler was not calledについてクラッシュする可能性があります

（1）スウィフト

func webView(webView: WKWebView, decidePolicyForNavigationAction navigationAction: WKNavigationAction, decisionHandler: ((WKNavigationActionPolicy) -> Void)) {
    if (custom condition){
        decisionHandler(XX) //  if... return as well
    } else {
        decisionHandler(XX)
    }
}

（2）OC

- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {

    NSString *url = [navigationAction.request.URL absoluteString];
    url = [url stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    if ([url rangeOfString:@"xxxx://"].location != NSNotFound) {
        // custom fundation
        decisionHandler(WKNavigationActionPolicyCancel);
         return; // the same as to use if...else 
    }
    decisionHandler(WKNavigationActionPolicyAllow);

}
5
Qun Li