NSInternalInconsistencyException：webView：decidePolicyForNavigationAction：decisionHandler 未调用

我正在尝试禁用 wkWebView 内的链接加载，因此我为此使用decidePolicyForNavigationAction，但我的应用程序给了我此错误：

由于未捕获的异常“NSInternalInconsistencyException”而终止应用程序 原因：“未调用传递给 -[ViewController webView:decidePolicyForNavigationAction:decisionHandler:] 的完成处理程序”

这是给我这个错误的简化代码：

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)
        }
    }
}

您必须致电decisionHanler对于每种情况。

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