起源
- 有一个界面的数据需要涉及多个网络请求，然后等所有网络请求完成后统一处理数据
代码
// MARK: 网络请求调度组
func datesRequestGroup(_ pickpickId: String){
let group = DispatchGroup()
let groupQueue = DispatchQueue(label: "hot_comment_requst")
// 网络请求A
group.enter()
groupQueue.async {
CommentService.init().hotCommentInfo(withPickPickId: pickpickId) { (responseData, code, responseString) in
guard code == 200 else {
group.leave()
return
}
self.hotCommentBaseData = CommentBaseData.model(with: responseData)
guard let list = self.hotCommentBaseData?.data else {
group.leave()
return
}
self.hotcomments.removeAll()
self.hotcomments = self.commentDataHandle(list, isHotComment: true)
group.leave()
}
}
// 网络请求B
group.enter()
groupQueue.async {
UserService.init().queryPickItemCommentList(withPickId: pickpickId, scroll: "") { (responseObject, code, responseString) in
guard code == 200 else {
group.leave()
return
}
self.commentsBaseData = CommentBaseData.model(with: responseObject)
guard let list = self.commentsBaseData?.data else {
group.leave()
return
}
self.comments.removeAll()
self.comments = self.commentDataHandle(list)
}
}
// 调度组里的任务都执行完毕执行
group.notify(queue: groupQueue) {
self.totalList.removeAll()
self.totalList = self.hotcomments + self.comments
}
}
注意
-
group.enter()和group.leave()必须成对出现
