iOS-GCD+RAC(信号量,用于多个请求)
2019-03-06 本文已影响0人
032c6843a285
需求:开发过程中某个界面多个请求,且有顺序~ 推荐2个方法,直接上代码块(即复制即用)
一、gcd 队列组
- (void)text_gcd{
weakSelf(self);
dispatch_group_t group = dispatch_group_create();
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
// 主线程 顺序执行。dispatch_sync
// 异步线程 顺序打乱 dispatch_async
dispatch_group_enter(group);
dispatch_sync(queue, ^{
SWLog(@"开始请求1111111");
[weakSelf get_TaskData:^{
SWLog(@"请求完成 11111111");
dispatch_group_leave(group);
}];
});
dispatch_group_enter(group);
dispatch_sync(queue, ^{
SWLog(@"开始请求2222222");
[weakSelf get_TaskData:^{
SWLog(@"请求完成 222222222");
dispatch_group_leave(group);
}];
});
dispatch_group_enter(group);
dispatch_sync(queue, ^{
SWLog(@"开始请求33333");
[weakSelf get_TaskData:^{
SWLog(@"请求完成 3333333");
dispatch_group_leave(group);
}];
});
dispatch_group_notify(group, dispatch_get_main_queue(), ^{
SWLog(@"请求上面123 后走这里,回到主线程 刷新UI");
});
}
#pragma mark - request
//模拟耗时请求
- (void)get_TaskData:(void(^)())successBlock{
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
successBlock();
});
}
- 打印结果
2019-03-06 16:22:30.365326+0800 MVVM+RAC[7201:533505] < ViewController.m:(109) > 开始请求1111111
2019-03-06 16:22:30.365474+0800 MVVM+RAC[7201:533505] < ViewController.m:(121) > 开始请求2222222
2019-03-06 16:22:30.365560+0800 MVVM+RAC[7201:533505] < ViewController.m:(130) > 开始请求33333
2019-03-06 16:22:30.463713+0800 MVVM+RAC[7201:533710] [] nw_proxy_resolver_create_parsed_array PAC evaluation error: NSURLErrorDomain: -1004
2019-03-06 16:22:32.447209+0800 MVVM+RAC[7201:533505] < ViewController.m:(111) > 请求完成 11111111
2019-03-06 16:22:32.447537+0800 MVVM+RAC[7201:533505] < ViewController.m:(123) > 请求完成 222222222
2019-03-06 16:22:32.447944+0800 MVVM+RAC[7201:533505] < ViewController.m:(132) > 请求完成 3333333
2019-03-06 16:22:32.448110+0800 MVVM+RAC[7201:533505] < ViewController.m:(138) > 请求上面123 后走这里,回到主线程 刷新UI
二、RAC(ReactiveCocoa（其简称为RAC）是由GitHub开源的一个应用于iOS和OS X开发的新框架。RAC具有函数式编程和响应式编程的特性)
pod 'ReactiveObjC', '~> 3.0.0' //建议纯oc代码使用ReactiveObjC
//信号量请求 类似gcd
- (void)liftSelector{
RACSignal *signal1 = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
SWLog(@"请求111");
[subscriber sendNext:@"11111成功"];
return nil;
}];
RACSignal *signal2 = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
SWLog(@"请求2222");
[subscriber sendNext:@"222222成功"];
return nil;
}];
[self rac_liftSelector:@selector(refeshUI::) withSignals:signal1,signal2, nil];
}
-(void)refeshUI:(id)one :(id)two{
NSLog(@"%@---%@",one,two);
}
Log 输出
2019-03-07 14:14:29.163017+0800 MVVM+RAC[9845:694036] < ViewController.m:(115) > 请求111
2019-03-07 14:14:32.189107+0800 MVVM+RAC[9845:694036] < ViewController.m:(121) > 请求2222
2019-03-07 14:14:34.192020+0800 MVVM+RAC[9845:694036] 11111成功---222222成功
