I want to make an Activity Indicator start animating and then stop after one second.
So does anyone know how I could do that?
class stuff {
@IBOutlet weak var indicator: UIActivityIndicatorView!
func iGotTriggeredBySomething {
indicator.startAimating()
//delay?
indicator.stopAnimating()
}
}
Thanks for answering.
dispatch_after()
is the standard way of delaying actions.
indicator.startAnimating()
let delay = 4.5 * Double(NSEC_PER_SEC)
let time = dispatch_time(DISPATCH_TIME_NOW, Int64(delay))
dispatch_after(time, dispatch_get_main_queue()) {
indicator.stopAnimating()
}
See: dispatch_after - GCD in swift?
Update for Swift 3.0
indicator.startAnimating()
let delay = Int(4.5 * Double(1000))
DispatchQueue.main.after(when: .now() + .milliseconds(delay)) {
indicator.stopAnimating()
}
However, in the spirit of Swift 3.0, I think extending DispatchQueue
would be a better solution.
extension DispatchQueue {
func delay(_ timeInterval: TimeInterval, execute work: () -> Void) {
let milliseconds = Int(timeInterval * Double(1000))
after(when: .now() + .milliseconds(milliseconds), execute: work)
}
}
This leaves us with a very nice
indicator.startAnimating()
DispatchQueue.main.delay(4.5) {
indicator.stopAnimating()
}
Update 2
Digging into the Xcode 8.0 beta, I found public func +(time: DispatchTime, seconds: Double) -> DispatchTime
. So, I guess this is valid…
indicator.startAnimating()
DispatchQueue.main.after(when: .now() + 4.5) {
indicator.stopAnimating()
}
I don't think there is a need to extend DispatchQueue
for something this clean already.
--
Update for Swift 3.1
There is new syntax for Swift 3.1. They just likes to change things don't they.
indicator.startAnimating()
DispatchQueue.main.asyncAfter(deadline: .now() + 4.5) {
indicator.stopAnimating()
}