WKWebView内存泄漏

WKWebView加载网页

当WKWebView与js交互时，会发生内存泄漏，造成webview无法释放。这可能造成进行js交互时响应异常

创建js交互的webview

//懒加载创建视图，并增加js监听
- (WKWebView *)webView {
    if (!_webView) {
        WKWebViewConfiguration *configuration = [[WKWebViewConfiguration alloc] init];
        configuration.userContentController = [WKUserContentController new];
        [configuration.userContentController addScriptMessageHandler:self name:@"goBack"];
        [configuration.userContentController addScriptMessageHandler:self name:@"getTokenInfo"];
//        [configuration.userContentController addScriptMessageHandler:self name:@"toPayWechat"];
//        [configuration.userContentController addScriptMessageHandler:self name:@"toPayAlipay"];
        [configuration.userContentController addScriptMessageHandler:self name:@"toPayApple"];
        [configuration.userContentController addScriptMessageHandler:self name:@"openUserAgreement"];

        [configuration.preferences setValue:@YES forKey:@"allowFileAccessFromFileURLs"];
        if (@available(iOS 10.0, *)) {
            [configuration setValue:@YES forKey:@"allowUniversalAccessFromFileURLs"];
        }
        WKPreferences *preferences = [WKPreferences new];
        preferences.javaScriptCanOpenWindowsAutomatically = YES;
        preferences.minimumFontSize = 10;
        configuration.preferences = preferences;
        _webView = [[WKWebView alloc] initWithFrame:CGRectZero configuration:configuration];
        _webView.navigationDelegate = self;
        _webView.UIDelegate = self;
        _webView.scrollView.backgroundColor = [UIColor whiteColor];
//        _webView.allowsBackForwardNavigationGestures = YES;
        
        // 垂直滚动
        //[_webView.scrollView setShowsVerticalScrollIndicator:NO];
        _webView.scrollView.bounces = NO;
        if (@available(iOS 11.0, *)) {
            _webView.scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
        }
    }
    return _webView;
}

解决泄漏

remove需要一一对应，dealloc中增加方法即可

//生命周期退出前，手动删除js交互，否则内存泄漏
- (void)removeJs{
    [_webView.configuration.userContentController removeScriptMessageHandlerForName:@"goBack"];
    [_webView.configuration.userContentController removeScriptMessageHandlerForName:@"getTokenInfo"];
    [_webView.configuration.userContentController removeScriptMessageHandlerForName:@"toPayApple"];
    [_webView.configuration.userContentController removeScriptMessageHandlerForName:@"openUserAgreement"];

}