33 lines
977 B
Swift
33 lines
977 B
Swift
//
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// UITextFieldExtension.swift
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// passKit
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//
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// Created by Yishi Lin on 5/4/17.
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// Copyright © 2017 Yishi Lin. All rights reserved.
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//
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import Foundation
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import UIKit
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private var kAssociationKeyNextField: UInt8 = 0
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extension UITextField {
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@IBOutlet var nextField: UITextField? {
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get {
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objc_getAssociatedObject(self, &kAssociationKeyNextField) as? UITextField
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}
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set(newField) {
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objc_setAssociatedObject(self, &kAssociationKeyNextField, newField, .OBJC_ASSOCIATION_RETAIN)
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}
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}
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func shake() {
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let animation = CAKeyframeAnimation(keyPath: "transform.translation.x")
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animation.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.linear)
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animation.repeatCount = 3
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animation.duration = 0.2 / TimeInterval(animation.repeatCount)
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animation.autoreverses = true
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animation.values = [3, -3]
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layer.add(animation, forKey: "shake")
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}
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}
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