GCD实现单个页面多个网络请求，需要监听所有网络请求结束后刷新UI的处理

dispatch_group_t group = dispatch_group_create(); dispatch_queue_t serialQueue = dispatch_queue_create("com.tikeyc.tikeyc", DISPATCH_QUEUE_SERIAL); dispatch_group_enter(group); dispatch_group_async(group, serialQueue, ^{ // 网络请求一 [TServiceTool GET:@"" parameters:@"" progress:^(NSProgress * _Nonnull downloadProgress) { } success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) { dispatch_group_leave(group); } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) { dispatch_group_leave(group); }]; }); dispatch_group_enter(group); dispatch_group_async(group, serialQueue, ^{ // 网络请求二 [TServiceTool GET:@"" parameters:@"" progress:^(NSProgress * _Nonnull downloadProgress) { } success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) { dispatch_group_leave(group); } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) { dispatch_group_leave(group); }]; }); dispatch_group_enter(group); dispatch_group_async(group, serialQueue, ^{ // 网络请求三 [TServiceTool GET:@"" parameters:@"" progress:^(NSProgress * _Nonnull downloadProgress) { } success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) { dispatch_group_leave(group); } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) { dispatch_group_leave(group); }]; }); // 所有网络请求结束后会来到这个方法 dispatch_group_notify(group, serialQueue, ^{ dispatch_async(dispatch_get_global_queue(0, 0), ^{ dispatch_async(dispatch_get_main_queue(), ^{ // 刷新UI }); }); });