标记

DispatchSemaphore

let semaphore = DispatchSemaphore(value: 0)    let dispatchQueue = DispatchQueue.global()    dispatchQueue.async {        WKManager().requestPreiodTrendData(symbol: self.compare1Item.code) { obj in            if let obj = obj {                self.trend1Data = obj.sorted(by: { (obj1, obj2) -> Bool in                    return obj1.key < obj2.key                })                semaphore.signal()            }        }        semaphore.wait()                WKManager().requestPreiodTrendData(symbol: self.compare2Item.code) { obj in            if let obj = obj {                self.trend2Data = obj.sorted(by: { (obj1, obj2) -> Bool in                    return obj1.key < obj2.key                })                semaphore.signal()            }        }        semaphore.wait()                DispatchQueue.main.async {            if self.indicatorView.isAnimating {                self.indicatorView.stopAnimating()            }            self.loadDataAndShow()        }    }复制代码

DispatchGroup

let group = DispatchGroup()    group.enter()    WKManager().requestPreiodTrendData(symbol: self.compare1Item.code) { obj in        if let obj = obj {            self.trend1Data = obj.sorted(by: { (obj1, obj2) -> Bool in                return obj1.key < obj2.key            })            group.leave()        }    }    group.enter()    WKManager().requestPreiodTrendData(symbol: self.compare2Item.code) { obj in        if let obj = obj {            self.trend2Data = obj.sorted(by: { (obj1, obj2) -> Bool in                return obj1.key < obj2.key            })            group.leave()        }    }    group.notify(queue: .main) {        if self.indicatorView.isAnimating {            self.indicatorView.stopAnimating()        }        self.loadDataAndShow()    }复制代码