swift dispatch after
let deadlineTime = DispatchTime.now() + .seconds(1)
DispatchQueue.main.asyncAfter(deadline: deadlineTime) {
print("test")
}swift dispatch after
let deadlineTime = DispatchTime.now() + .seconds(1)
DispatchQueue.main.asyncAfter(deadline: deadlineTime) {
print("test")
}DispatchGroup example swift
class DispatchGroupExample: UIViewController {
private let dispatchGroup = DispatchGroup()
override func viewDidLoad() {
super.viewDidLoad()
fetchData(url: xxx)
fetchData(url: yyy)
// 3: notify job done
dispatchGroup.notify(queue: .main) {
self.goToNext()
}
}
private func fetchData(url: URL) {
// 1: enter group
dispatchGroup.enter()
URLSession.shared.dataTask(with: url) {
[weak self] (data, urlResponse, error) in
// parse data
...
// 2: leave group
self?.dispatchGroup.leave()
}
}
}Copyright © 2021 Codeinu
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