How do i add a delay in Xcode?
self.label1.alpha = 1.0
//delay
self.label1.alpha = 0.0
I'd like to make it wait about 2 seconds. I've read about time_dispatch and importing the darwin library, but i haven't been able to make it work. So can someone please explain it properly step by step?
You only have to write this code:
self.label1.alpha = 1.0
let delay = 2 * Double(NSEC_PER_SEC)
let time = dispatch_time(DISPATCH_TIME_NOW, Int64(delay))
dispatch_after(time, dispatch_get_main_queue()) {
// After 2 seconds this line will be executed
self.label1.alpha = 0.0
}
'2' is the seconds you want to wait
Regards
This is another option that works -
import Darwin
sleep(2)
Then, you can use the sleep function, which takes a number of seconds as a parameter.
Might be better to use blocks for this one:
self.label1.alpha = 1.0;
UIView animateWithDuration:2.0 animations:^(void) {
self.label1.alpha = 0.0;
}];
For Swift 5:
self.label1.alpha = 1.0
let delay : Double = 2.0 //delay time in seconds
let time = DispatchTime.now() + delay
DispatchQueue.main.asyncAfter(deadline:time){
// After 2 seconds this line will be executed
self.label1.alpha = 0.0
}
This works for me.
Referring to: Delay using DispatchTime.now() + float?
I wouldn't recommend for production, but does the trick
import Foundation
func block(for t: Double) {
let group = DispatchGroup()
group.enter()
let _ = group.wait(timeout: .now() + t)
}
