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25 lines
836 B
Swift
25 lines
836 B
Swift
//
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// Copyright (c) 2019 Open Whisper Systems. All rights reserved.
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//
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// Based on https://stackoverflow.com/questions/1823317/get-the-current-first-responder-without-using-a-private-api/11768282#11768282
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extension UIResponder {
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private weak static var firstResponder: UIResponder?
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@objc
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public class func currentFirstResponder() -> UIResponder? {
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firstResponder = nil
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// If target (`to:`) is nil, the app sends the message to the first responder,
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// from whence it progresses up the responder chain until it is handled.
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UIApplication.shared.sendAction(#selector(setSelfAsFirstResponder(sender:)), to: nil, from: nil, for: nil)
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return firstResponder
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}
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@objc
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private func setSelfAsFirstResponder(sender: AnyObject) {
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UIResponder.firstResponder = self
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}
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}
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