如何使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
}
到目前为止，这就是我所拥有的。
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
你要用NSOperation Queue吗？这是通过调度组实现的方法：
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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我来说两句