After I installed xcode13 and updated pods of my swiftui project by executing pod update, it occurred an unexpected compile error when I tried to run my project.
Cannot assign value of type '()' to type 'DispatchSourceTimer?'
Is this a new bug? or I did something wrong? See my code below:
//use case for counting down time
self.timer = DispatchSource.dispatchTimer(timeInterval: 1, handler: { dispatchTimer in
self.time -= 1
if self.time < 0 {
dispatchTimer?.cancel()
self.next()
}
}, needRepeat: true)
//DispatchSource extension function
public extension DispatchSource {
class func dispatchTimer(timeInterval: Double, handler: @escaping (DispatchSourceTimer?) -> Void, needRepeat: Bool) {
let timer = DispatchSource.makeTimerSource(flags: [], queue: DispatchQueue.main)
timer.schedule(deadline: .now(), repeating: timeInterval)
timer.setEventHandler {
DispatchQueue.main.async {
if needRepeat {
handler(timer)
} else {
timer.cancel()
handler(nil)
}
}
}
timer.resume()
}
}
Please help!
You are not showing all your code, but it looks like...
- self.timer is a DispatchSourceTimer
- dispatchTimer(timeInterval:handler:) has no return type
...so your assignment of dispatchTimer() to self.timer will not compile (you are trying to assign a closure, when a DispatchSourceTimer is expected).
Perhaps you intended?
class func dispatchTimer(timeInterval: Double, handler: @escaping (DispatchSourceTimer?) -> Void, needRepeat: Bool) -> DispatchSourceTimer {
Then dispatchTimer() could return "timer", and the assignment would work.
