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August 29, 2015 14:09
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Swift class extension on UIViewController using the navigation item to display a toast for a given number of seconds.
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| import UIKit | |
| import Dispatch | |
| struct PromptToast { | |
| static let ErrorMessageDisplayDuration = 5.2 | |
| } | |
| extension UIViewController { | |
| func toast(message: String, duration: Double) { | |
| /* Make sure we have a navigation controller */ | |
| if let n = navigationController { | |
| navigationItem.prompt = message | |
| let mainQueue = dispatch_get_main_queue() | |
| let dispatch_duration = dispatch_time(DISPATCH_TIME_NOW, Int64(duration * Double(NSEC_PER_SEC))) | |
| /* See Grand Central Dispatch Reference for note on NSEC_PER_SEC */ | |
| /* Push or pop controllers and the prompt will change to that | |
| * controller’s prompt (default is nil). Tested iOS 8, 8.1 */ | |
| dispatch_after(dispatch_duration, mainQueue, { | |
| self.navigationItem.prompt = nil | |
| }) | |
| } | |
| /* else { | |
| * println("View controller cannot toast without a navigation controller") | |
| * /* Debugging only. */ | |
| * } */ | |
| } | |
| } |
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