WKWebView崩溃记录——SIGSEGV(11)

2019-06-20 20:49:10 浏览数 (1)

关键词: WKWebView SIGSEGV(11) WebKit::LegacyCustomProtocolManagerProxy::stopLoading(unsigned long long) WKProcessPool

在QA测试疯狂把玩App时,突然出现了crash问题,而且还是一个概率非常小的偶发crash。吓得我立马跑到bugly上查看crash记录。在通过符号表转换后,我得到了以下crash时的堆栈信息。

代码语言:javascript复制
0 WebKit    WebKit::LegacyCustomProtocolManagerProxy::stopLoading(unsigned long long)   20
1 CFNetwork ___65-[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:]_block_invoke   60
2 CFNetwork -[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:]   196
3 CFNetwork -[NSURLConnectionInternal _withActiveConnectionAndDelegate:]   56
4 CFNetwork ___ZN27URLConnectionClient_Classic26_delegate_didFinishLoadingEU13block_pointerFvvE_block_invoke   100
5 CFNetwork ___ZN27URLConnectionClient_Classic18_withDelegateAsyncEPKcU13block_pointerFvP16_CFURLConnectionPK33CFURLConnectionClientCurrent_VMaxE_block_invoke_2   108
6 libdispatch.dylib __dispatch_client_callout   16
7 libdispatch.dylib __dispatch_block_invoke_direct$VARIANT$armv81   216
8 CFNetwork RunloopBlockContext::_invoke_block(void const*, void*)   36
9 CoreFoundation    CFArrayApplyFunction   80
10 CFNetwork    RunloopBlockContext::perform()   128
11 CFNetwork    MultiplexerSource::perform()   312
12 CFNetwork    MultiplexerSource::_perform(void*)   60
13 CoreFoundation   ___CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__   24
14 CoreFoundation   ___CFRunLoopDoSource0   88
15 CoreFoundation   ___CFRunLoopDoSources0   176
16 CoreFoundation   ___CFRunLoopRun   1004
17 CoreFoundation   CFRunLoopRunSpecific   436
18 GraphicsServices GSEventRunModal   104
19 UIKitCore    UIApplicationMain   212
20 gymbo    0x0000000104f50000   717816
21 libdyld.dylib    _start   4

触发场景: 加载WKWebView的ViewController被释放,但WKWebView内容还在加载中,即使在VC的 dealloc(swift版本的是 deinit 方法)中设置webView stoploading以及WKWebView UIDelegate和navigationDelegate设置为nil,也会偶发该崩溃。

解决方案: WKWebView中的WKProcessPool类,设置成单例 代码:swift版 声明WKProcessPool为单例

代码语言:javascript复制
// MARK: - 扩展WKProcessPool,使其变成单例,所有WKWebView共享Cookie数据
extension WKProcessPool {
  static var SharedProcessPool: WKProcessPool = {
    var sharePool = WKProcessPool()
    return sharePool
  }()
  
  class func sharedProcessPool() -> WKProcessPool {
    return SharedProcessPool
  }
}

在WKWebView初始化时,配置processPool

代码语言:javascript复制
      let configuration = WKWebViewConfiguration()
      configuration.processPool = WKProcessPool.sharedProcessPool()
      let webView = WKWebView(frame: UIScreen.main.bounds, configuration: configuration)

后面会说明查找分析问题过程以及其中原理


bugly符号表解析后的出错堆栈截图

bugly自定义跟踪日志截图

方案有效的原因: WKProcessPool类的作用,以及崩溃触发的根本原因,还在研究中~后续会补充


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