iOS 添加WKWebView導致控制器無法釋放的問題

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在WkWebView與JavaScript互動中，經常會在原生中注入MessageHandler,app中注入MessageHandler的方法

    WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];    config.userContentController = [WKUserContentController new];    //注入handler    [config.userContentController addScriptMessageHandler:self name:@"HandlerName"];

這裡我們發現在向JS中注入handler的時候強引用了self,最終導致記憶體流失

解決方案 添加一個新類 WeakScriptMessageDelegate

@interface WeakScriptMessageDelegate : NSObject<WKScriptMessageHandler>@property (nonatomic, weak) id<WKScriptMessageHandler> scriptDelegate;- (instancetype)initWithDelegate:(id<WKScriptMessageHandler>)scriptDelegate;@end@implementation WeakScriptMessageDelegate- (instancetype)initWithDelegate:(id<WKScriptMessageHandler>)scriptDelegate {    self = [super init];    if (self) {        _scriptDelegate = scriptDelegate;    }    return self;}- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {    [self.scriptDelegate userContentController:userContentController didReceiveScriptMessage:message];}@end

使用 添加了下面這行代碼之後ViewController就會調用dealloc方法，此時ViewController已經正常釋放。但是WeakScriptMessageDelegate沒有釋放，需要在dealloc中將WeakScriptMessageDelegate釋放掉。

    WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];    config.userContentController = [WKUserContentController new];    //注入handler    [config.userContentController addScriptMessageHandler:[[WeakScriptMessageDelegate alloc] initWithDelegate:self] name:@"HandlerName"];

釋放WeakScriptMessageDelegate 在dealloc方法中實現

    [self.webView.configuration.userContentController removeScriptMessageHandlerForName:@"HandlerName"];

iOS 添加WKWebView導致控制器無法釋放的問題