swift - In iOS, how do I create a button that is always on top of all other view controllers? - Stack Overflow
func floatingButtonWasTapped() {
let alert = UIAlertController(title: "Warning", message: "Don't do that!", preferredStyle: .Alert)
let action = UIAlertAction(title: "Sorry…", style: .Default, handler: nil)
window?.rootViewController?.presentViewController(alert, animated: true, completion: nil)
ios  swift  button  callindicator 
january 2020
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online  courses  programming  computer  science 
september 2019
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