97 lines
3.7 KiB
Swift
97 lines
3.7 KiB
Swift
//
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// Animation.swift
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// TPGHorizontalMenu
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//
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// Created by David Livadaru on 10/03/2017.
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// Copyright © 2017 3Pillar Global. All rights reserved.
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//
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import UIKit
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/// A class which provides and abstraction for an animation
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///
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/// - seealso:
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/// [UIView - animateWithDuration:delay:usingSpringWithDamping:initialSpringVelocity:options:animations:completion:]
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/// (apple-reference-documentation://hcEaMPVO1d)
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public class Animation: NSObject {
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public typealias AnimationClosure = () -> Void
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public typealias CompletionClosure = ((_ finished: Bool) -> Void)
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/// Animation's duration in seconds.
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public let duration: TimeInterval
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/// The amount of time to wait before animation begins. The time is specifed in seconds.
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public let delay: TimeInterval
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/// An object which provides facility to use dynamics for animation.
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public let dynamics: AnimationDynamics?
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/// Animation's options.
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public let options: UIView.AnimationOptions
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/// Closure where changes will be performed using an animation.
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public private (set) var animation: AnimationClosure?
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/// Closure which specifies the end of animation.
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public private (set) var completion: CompletionClosure?
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/// Property which says if the animation is in progress or not.
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public private (set) var inProgress: Bool = false
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/// Create an animation with specified parameters.
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///
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/// - Parameters:
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/// - duration: duration in seconds.
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/// - delay: the amount of time to wait before animation begins. The time is specifed in seconds.
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/// - dynamics: an object which provides facility to use dynamics for animation.
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/// - options: animation's options.
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/// - animation: closure where changes will be performed using an animation.
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/// - completion: closure which specifies the end of animation.
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public init(duration: TimeInterval, delay: TimeInterval = 0.0, dynamics: AnimationDynamics? = nil,
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options: UIView.AnimationOptions = [], animation: AnimationClosure? = nil,
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completion: CompletionClosure? = nil) {
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self.duration = duration
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self.delay = delay
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self.dynamics = dynamics
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self.options = options
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self.animation = animation
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self.completion = completion
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super.init()
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}
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public func addAnimation(_ animation: @escaping AnimationClosure) {
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let currentAnimation = self.animation
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self.animation = {
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currentAnimation?()
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animation()
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} as Animation.AnimationClosure
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}
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public func addCompletion(_ completion: @escaping CompletionClosure) {
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let currentCompletion = self.completion
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self.completion = { finished in
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currentCompletion?(finished)
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completion(finished)
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}
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}
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/// Performs animation using the provided properties. Must be called on main queue.
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public func animate() {
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inProgress = true
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let animation = self.animation
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let completion = { [weak self] (_ finished: Bool) in
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guard let strongSelf = self else { return }
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strongSelf.inProgress = false
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strongSelf.completion?(finished)
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}
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if let dynamics = dynamics {
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UIView.animate(withDuration: duration, delay: delay,
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usingSpringWithDamping: dynamics.dampingRatio,
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initialSpringVelocity: dynamics.velocity, options: options, animations: {
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animation?()
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}, completion: completion)
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} else {
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UIView.animate(withDuration: duration, delay: delay, options: options, animations: {
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animation?()
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}, completion: completion)
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}
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}
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}
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