在Swift中我在哪里定义嵌套闭包的捕获引用？以这段代码为例:importFoundationclassExampleDataSource{varcontent:Any?funcloadContent(){ContentLoader.loadContentFromSource(){[weakself]loadedContentin//completionhandlercalledonbackgroundthreaddispatch_async(dispatch_get_main_queue()){[weakself]inself?.content=loadedContent}}}}cl
