iOS开发,如何在多个接口请求到数据之后,再刷新UI界面
1、使用 DispatchGroup解决,如下图,我在自己项目中使用真实的网络请求接口实现( 这种是不开启子线程的线程组)
1 func test() { 2 let group = DispatchGroup() 3 group.enter() 4 productListParaDict["storeId"] = getCurrentStoreId() 5 NetWorkRequest(.storeProductList(parameters: productListParaDict), completion: { (responseString) -> (Void) in 6 print("商品列表数据已成功获取") 7 group.leave() 8 }) { (responseString) -> (Void) in 9 print("商品列表数据获取失败") 10 group.leave() 11 } 12 print("开始请求商品数量") 13 group.enter() 14 var param : [String:Any] = Dictionary() 15 param["storeId"] = getCurrentStoreId() 16 param["enable"] = "1" 17 NetWorkRequest(.storeProductGetStateCount(parameters: param), completion: { (responseString) -> (Void) in 18 print("商品数量数据已成功获取") 19 group.leave() 20 }) { (responseString) -> (Void) in 21 print("商品数量数据获取失败") 22 group.leave() 23 } 24 group.notify(queue: DispatchQueue.main) { 25 print("更新UI") 26 } 27 }
来看下控制台的打印输出,是不是实现了,两个接口数据都拿到了,然后到主线程去刷新UI界面了
2、开启子线程的线程组
1 func test1() { 2 let queneE = DispatchQueue(label: "group.quene") 3 let groupE = DispatchGroup() 4 queneE.async(group: groupE, qos: .default, flags: []) { 5 groupE.enter() 6 self.productListParaDict["storeId"] = getCurrentStoreId() 7 NetWorkRequest(.storeProductList(parameters: self.productListParaDict), completion: { (responseString) -> (Void) in 8 print("商品列表数据已成功获取") 9 groupE.leave() 10 }) { (responseString) -> (Void) in 11 print("商品列表数据获取失败") 12 groupE.leave() 13 } 14 } 15 print("开始请求商品数量") 16 queneE.async(group: groupE, qos: .default, flags: []) { 17 groupE.enter() 18 var param : [String:Any] = Dictionary() 19 param["storeId"] = getCurrentStoreId() 20 param["enable"] = "1" 21 NetWorkRequest(.storeProductGetStateCount(parameters: param), completion: { (responseString) -> (Void) in 22 print("商品数量数据已成功获取") 23 groupE.leave() 24 }) { (responseString) -> (Void) in 25 print("商品数量数据获取失败") 26 groupE.leave() 27 } 28 } 29 groupE.notify(queue: DispatchQueue.main) { 30 print("更新UI") 31 } 32 }
同样的,来看下控制台的打印输出