Ios UIWebview在完全加载之前崩溃

UIWebView

委托方法在

func webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebViewNavigationType)

在加载完成之前委托方法

    thread #1: tid = 0x17c17, 0x000000010f7273ea libswiftFoundation.dylib`static Foundation.URLRequest._unconditionallyBridgeFromObjectiveC (Swift.Optional<__ObjC.NSURLRequest>) -> Foundation.URLRequest + 42, queue = 'com.apple.main-thread', stop reason = EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)
    frame #0: 0x000000010f7273ea libswiftFoundation.dylib`static Foundation.URLRequest._unconditionallyBridgeFromObjectiveC (Swift.Optional<__ObjC.NSURLRequest>) -> Foundation.URLRequest + 42
    frame #1: 0x00000001075ade6b StoreFront`@objc SFDocSigningViewController.webView(UIWebView, shouldStartLoadWith : URLRequest, navigationType : UIWebViewNavigationType) -> Bool + 75 at SFDocSigningViewController.swift:0
    frame #2: 0x000000010dbcbf1e UIKit`-[UIWebView webView:decidePolicyForNavigationAction:request:frame:decisionListener:] + 280

代码>线程Th 1：TID= 0x17000 C17，0x000 000 F1073EA LBiSWIFTFAST。DyLIB静态基础。URL请求。 第0帧：0x000 000 010F727 3EA LIVSWIFT基金会。 框架#1:0x00000001075ade6b店面`@objc SFDocSigningViewController.webView（UIWebView，shouldStartLoadWith:URLRequest，navigationType:UIWebViewNavigationType）->SFDocSigningViewController处的Bool+75。swift:0 帧#2:0x000000010dbcbf1e UIKit`-[UIWebView-webView:DecisionPolicyFornavigation操作：请求：帧：decisionListener:+280

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