我执行2个http请求,并从它们异步获取数据。数据收到后,我需要在其基础上形成一个数组并重新加载表,我如何做到这一点呢?代码:
override func viewDidLoad() {
super.viewDidLoad()
ApiManager.shared.getStocks(completion: {result in
DispatchQueue.main.async {
switch result {
case .success(let stocks):
self.stocks = stocks
case .failure:
self.stocks = []
}
print(self.stocks.count)
}
})
ApiManager.shared.getDowJones (completion: { result in
DispatchQueue.main.async {
switch result {
case .success(let dowJones):
self.dowJones = dowJones
case .failure:
self.dowJones = []
}
print(self.dowJones.prefix(10))
}
})
}
最佳匹配DispatchGroup
let g = DispatchGroup()
g.enter()
ApiManager.shared.getStocks(completion: {result in
DispatchQueue.main.async {
switch result {
case .success(let stocks):
self.stocks = stocks
case .failure:
self.stocks = []
}
g.leave()
print(self.stocks.count)
}
})
g.enter()
ApiManager.shared.getDowJones (completion: { result in
DispatchQueue.main.async {
switch result {
case .success(let dowJones):
self.dowJones = dowJones
case .failure:
self.dowJones = []
}
g.leave()
print(self.dowJones.prefix(10))
}
})
g.notify(queue:.main) {
// reload here
}
您可以将一个动态变量作为APISuccess,然后在API成功时激发它,现在您所需要做的就是将该变量绑定到视图控制器中,并编写一个代码以保护它的bolck。