swift中利用系统线程实现异步加载数据同步更新UI

swift中的使用案例样式

// Mark: -数据源更新

typealias AddDataBlock = () ->Void

var updataBlock:AddDataBlock?

func loadLiveData(){

let grpup = DispatchGroup()

grpup.enter()

//        //首页直播接口请求

HomeLiveProvider.request(.liveList) { result in

if case let .success(response) = result {

//解析数据

let data = try? response.mapJSON()

let json = JSON(data!)

if let mappedObject = JSONDeserializer<HomeLiveModel>.deserializeFrom(json: json.description) { // 从字符串转换为对象实例

self.lives = mappedObject.data?.lives

self.categoryVoList = mappedObject.data?.categoryVoList

//                    self.collectionView.reloadData()

// 更新tableView数据

//                    self.updataBlock?()

grpup.leave()

}

}

}

grpup.enter()

//        //首页直播滚动图接口请求

HomeLiveProvider.request(.liveBannerList) { result in

if case let .success(response) = result {

//解析数据

let data = try? response.mapJSON()

let json = JSON(data!)

if let mappedObject = JSONDeserializer<HomeLiveBanerModel>.deserializeFrom(json: json.description) { // 从字符串转换为对象实例

self.homeLiveBanerList = mappedObject.data

//                    let index: IndexPath = IndexPath.init(row: 0, section: 1)

//                    self.collectionView.reloadItems(at: [index])

// 更新tableView数据

//                    self.updataBlock?()

grpup.leave()

}

}

}

grpup.enter()

//        //首页直播排行榜接口请求

HomeLiveProvider.request(.liveRankList) { result in

if case let .success(response) = result {

//解析数据

let data = try? response.mapJSON()

let json = JSON(data!)

if let mappedObject = JSONDeserializer<HomeLiveRankModel>.deserializeFrom(json: json.description) { // 从字符串转换为对象实例

self.multidimensionalRankVos = mappedObject.data?.multidimensionalRankVos

//                    let index: IndexPath = IndexPath.init(row: 0, section: 2)

//                    self.collectionView.reloadItems(at: [index])

// 更新tableView数据

//                    self.updataBlock?()

grpup.leave()

}

}

}

grpup.notify(queue: DispatchQueue.main) {

self.updataBlock?()

}

}

oc中的使用样式

//一个并发队列

dispatch_queue_t queueE = dispatch_queue_create("group.queue", DISPATCH_QUEUE_CONCURRENT);

//一个线程组

dispatch_group_t groupE = dispatch_group_create();

////1.请求轮播图的数据

dispatch_group_async(groupE, queueE, ^{

dispatch_group_enter(groupE);

dispatch_async(dispatch_get_global_queue(0, 0), ^{

[self requestCarousel:^{

dispatch_group_leave(groupE);

}];

});

});

////2.请求新闻轮播图的数据

dispatch_group_async(groupE, queueE, ^{

dispatch_group_enter(groupE);

dispatch_async(dispatch_get_global_queue(0, 0), ^{

[self requestNews:^{

dispatch_group_leave(groupE);

}];

});

});

////3.校园活动【师生展评】

dispatch_group_async(groupE, queueE, ^{

dispatch_group_enter(groupE);

dispatch_async(dispatch_get_global_queue(0, 0), ^{

//3.校园活动【师生展评】

[self requestCampAcitivetis:^{

dispatch_group_leave(groupE);

}];

});

});

////4.尾部视图

dispatch_group_async(groupE, queueE, ^{

dispatch_group_enter(groupE);

dispatch_async(dispatch_get_global_queue(0, 0), ^{

//3.尾部视图

[self requestClass:^{

dispatch_group_leave(groupE);

}];

});

});

dispatch_group_notify(groupE, dispatch_get_main_queue(), ^{

//staticWeakSelf 随情况而定

[staticWeakSelf setUpUI];

});

//1.请求轮播图的数据

- (void)requestCarousel:(void(^)(void))leveBlock{

　　

[AFHTTPRequestManager reqesutSuccess{

　　　　

　　

　　if (leveBlock) {

leveBlock();

}

　　} requestFaliure{

　　　　

　　if (leveBlock) {

leveBlock();

}

　　}

}