[英]How do I perform an action after receiving data from two asynchronous functions? Swift
我执行 2 个 http 请求并异步从中获取数据。 接收到数据后,需要根据它组成一个数组并重新加载表,我该怎么做呢? 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))
}
})
}
最合适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,然后在您获得 API 成功时触发该变量,现在您需要做的就是在您的视图 controller 中绑定该变量并编写一个代码 indise 它是块。
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