ios – NSOperationQueue如何等待两个异步 *** 作？

概述如何让NSOperationQueue(或其他任何东西)等待带有回调的两个异步网络调用？流程需要看起来像这样 Block Begins { Network call with call back/block begins { first network call is done }}Second Block Begins { Network call 如何让NSOperationQueue(或其他任何东西)等待带有回调的两个异步网络调用？流程需要看起来像这样

Block Begins {    Network call with call back/block begins {        first network call is done     }}Second Block Begins {    Network call with call back/block begins {        second network call is done     }} Only run this block once the NETWORK CALLS are done {    blah}

这是我到目前为止所拥有的.

NSOperationQueue *queue = [[NSOperationQueue alloc] init];__block Nsstring *var;[queue addOperation:[NSBlockOperation blockOperationWithBlock:^{   [AsyncReq get:^{       code    } onError:^(NSError *error) {       code    }];}]];[queue addOperation:[NSBlockOperation blockOperationWithBlock:^{   [AsyncReq get:^{       code    } onError:^(NSError *error) {       code    }];}]];[queue waitUntilAllOperationsAreFinished];//do something with both of the responses

解决方法 你必须使用NSOperation Queue吗？以下是您如何使用调度组执行此 *** 作：

dispatch_group_t group = dispatch_group_create();dispatch_group_enter(group);[AsyncReq get:^{    code    dispatch_group_leave(group); } onError:^(NSError *error) {    code    dispatch_group_leave(group);}];dispatch_group_enter(group);[AsyncReq get:^{    code    dispatch_group_leave(group); } onError:^(NSError *error) {    code    dispatch_group_leave(group);}];dispatch_group_notify(group,dispatch_get_main_queue(),^{    NSLog(@"Both operations completed!")});

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