> On Oct 16, 2016, at 11:25 AM, Thierry Passeron via swift-users 
> <swift-users@swift.org> wrote:
> 
> Hello All,
> 
> I’m in the process of migrating older code to Swift 3 and I’m stuck on this 
> one.
> How do you create a timer dispatch source?
> 
> Old code:
> 
> let source = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue)
> 
> dispatch_source_set_timer(source, dispatch_time(DISPATCH_TIME_NOW, 0), 
> UInt64(interval * 1000_000_000), 0)
> dispatch_source_set_event_handler(source) {
>   // Do something useful
> }
> 
> dispatch_resume(source)
> 
> New code:

let timer = DispatchSource.makeTimerSource(queue: queue)
timer.scheduleRepeating(wallDeadline: .now(), interval: .seconds(1))
timer.setEventHandler {
    // Do something useful
}
timer.resume()

Isn’t it nice? It is a pity it is not well documented yet.

> Xcode is not helping me with any of the required refactoring. The convert 
> tool throws many errors but no proposition.
> I have tried to explore the New Dispatch headers with no luck. 
> DISPATCH_SOURCE_TYPE_TIMER can’t be found… ok so It seems to be replaced with 
> a protocol DispatchSourceTimer and … no initializer… I think I don’t yet 
> catch with the whole philosophy of this new version. 
> 
> I’d be pleased if anyone cared to enlighten me.
> 
> Thanks and regards,
> Thierry
> 
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