<分区>
<分区>
我写了一个非常简单的应用程序来测试 Combine 和 NotificationCenter:
extension Notification.Name {
static let Test = Notification.Name(rawValue: "Test")
}
// SOLUTION 1
NotificationCenter.default
.publisher(for: .Test)
.sink(receiveCompletion: { _ in
print("SOLUTION 1: COMPLETION")
}, receiveValue: { _ in
print("SOLUTION 1: VALUE")
})
// SOLUTION 2
NotificationCenter.Publisher(center: .default, name: .Test)
.sink(receiveCompletion: { _ in
print("SOLUTION 2: COMPLETION")
}, receiveValue: { _ in
print("SOLUTION 2: VALUE")
})
// SOLUTION 3
NotificationCenter.default.addObserver(self, selector: #selector(doSomething), name: .Test, object: nil)
@objc
func doSomething() {
print("SOLUTION 3: VALUE")
}
// RAISE NOTIFICATION
NotificationCenter.default.post(name: .Test, object: nil)NotificationCenter.default.post(name: .Test, object: nil)
使用 Combine 无法捕获通知。唯一可行的解决方案是第三种，旧式的。奇怪的是，如果我在 Playground 中运行相同的代码，它会起作用!
该项目的部署目标是 iOS 13。我已经在物理设备和模拟器上执行了该应用程序。我还安装了 iOS 13.2.2 模拟器。
有什么建议吗？
最佳答案
不要忘记将可取消实例存储在集合或变量中。 示例(使用 Set):
private var cancellableBag = Set<AnyCancellable>()
NotificationCenter.default
.publisher(for: .Test)
.sink(receiveCompletion: { _ in
print("SOLUTION 1: COMPLETION")
}, receiveValue: { _ in
print("SOLUTION 1: VALUE")
})
.store(in: &cancellableBag)
或者使用变量:
private let cancellable: AnyCancellable?
cancellable = NotificationCenter.default
.publisher(for: .Test)
.sink(receiveCompletion: { _ in
print("SOLUTION 1: COMPLETION")
}, receiveValue: { _ in
print("SOLUTION 1: VALUE")
})
关于ios - 合并和 NotificationCenter : Notifications not working，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/59666945/