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Swift4.1轉(zhuǎn)場動畫實現(xiàn)側(cè)滑抽屜效果

來源：本站原創(chuàng)|時間：2020-01-11|欄目：Swift|點擊： 次

本文實現(xiàn)使用了Modal轉(zhuǎn)場動畫，原因是項目多由導航控制器和標簽控制器作為基類，為了不影響導航控制器的代理，轉(zhuǎn)場動畫使用模態(tài)交互。

代碼使用SnapKit進行布局，能夠適應(yīng)屏幕旋轉(zhuǎn)。手勢速率大于300或進度超過30%的時候直接完成動畫，否則動畫回滾取消，具體數(shù)值可以修改對應(yīng)的常量。抽屜出現(xiàn)的時候，主控制有遮罩，對應(yīng)關(guān)鍵字是mask。

實現(xiàn)文件只有兩個

DrawerControl：控制抽屜出現(xiàn)，一行代碼即可調(diào)用

Animator：負責動畫實現(xiàn)，包括了交互式的代理事件和非交互式的代理事件

//
// DrawerControl.swift
// PratiseSwift
//
// Created by EugeneLaw on 2018/7/31.
// Copyright © 2018年 EugeneLaw. All rights reserved.
//
 
import UIKit
 
enum DrawerSize {
 case Left
 case Right
}
 
class DrawerControl: NSObject {
 
 /**主頁面*/
 var base: UIViewController?
 /**抽屜控制器*/
 var drawer: UIViewController?
 /**抽屜在左邊還是右邊，默認左邊，沒有實現(xiàn)右邊，要右邊自己去animator里面加判斷*/
 var whichSize = DrawerSize.Left
 /**拖拽手勢*/
 var panBase: UIPanGestureRecognizer?
 var panDrawer: UIPanGestureRecognizer?
 /**主頁面在抽屜顯示時保留的寬度*/
 var baseWidth: CGFloat {
 get {
 return self.animator!.baseWidth
 }
 set {
 self.animator?.baseWidth = newValue
 }
 }
 /**是否應(yīng)該響應(yīng)手勢*/
 var shouldResponseRecognizer = false
 /**效果響應(yīng)*/
 var animator: Animator?
 
 
 init(base: UIViewController, drawer: UIViewController) {
 super.init()
 self.base = base
 self.drawer = drawer
 animator = Animator(base: self.base!, drawer: self.drawer!)
 self.panBase = UIPanGestureRecognizer(target: self, action: #selector(panBaseAction(pan:)))
 base.view.addGestureRecognizer(self.panBase!)
 self.panDrawer = UIPanGestureRecognizer(target: self, action: #selector(panDrawerAction(pan:)))
 drawer.view.addGestureRecognizer(self.panDrawer!)
 self.drawer?.transitioningDelegate = self.animator
 }
 
 deinit {
 if self.panBase != nil {
 self.base?.view.removeGestureRecognizer(self.panBase!)
 self.panBase = nil
 }
 if self.panDrawer != nil {
 self.drawer?.view.removeGestureRecognizer(self.panDrawer!)
 self.panDrawer = nil
 }
 }
 
}
 
extension DrawerControl {
 
 ///顯示抽屜
 func show() {
 if (self.base?.view.frame.origin.x)! > SCREEN_WIDTH/2 {
 return
 }
 self.animator?.interative = false
 self.base?.present(self.drawer!, animated: true, completion: nil)
 }
 
 ///關(guān)閉抽屜，或直接dismiss即可
 func close() {
 self.animator?.interative = false
 self.drawer?.dismiss(animated: true, completion: nil)
 }
 
}
 
extension DrawerControl {
 
 @objc func panBaseAction(pan: UIPanGestureRecognizer) {
 let transition = pan.translation(in: self.drawer?.view)
 let percentage = CGFloat(transition.x/SCREEN_WIDTH)
 let velocity = CGFloat(fabs(pan.velocity(in: self.drawer?.view).x))
 switch pan.state {
 case .began:
 if transition.x < 0 {
 shouldResponseRecognizer = false
 }else {
 shouldResponseRecognizer = true
 }
 if shouldResponseRecognizer {
 self.beginAnimator(showDrawer: true)
 }
 case .changed:
 if shouldResponseRecognizer {
 self.updateAnimator(percentage)
 }
 default:
 if shouldResponseRecognizer {
 self.cancelAnimator(percentage, velocity: velocity)
 }
 }
 }
 
 @objc func panDrawerAction(pan: UIPanGestureRecognizer) {
 let transition = pan.translation(in: self.drawer?.view)
 let percentage = CGFloat(-transition.x/SCREEN_WIDTH)
 let velocity = CGFloat(fabs(pan.velocity(in: self.drawer?.view).x))
 switch pan.state {
 case .began:
 if transition.x > 0 {
 shouldResponseRecognizer = false
 }else {
 shouldResponseRecognizer = true
 }
 if shouldResponseRecognizer {
 self.beginAnimator(showDrawer: false)
 }
 case .changed:
 if shouldResponseRecognizer {
 self.updateAnimator(percentage)
 }
 default:
 if shouldResponseRecognizer {
 self.cancelAnimator(percentage, velocity: velocity)
 }
 }
 }
 
 func beginAnimator(showDrawer: Bool) {
 self.animator?.interative = true
 if showDrawer {
 self.base?.transitioningDelegate = self.animator
 self.base?.present(self.drawer!, animated: true, completion: nil)
 }else {
 self.drawer?.transitioningDelegate = self.animator
 self.drawer?.dismiss(animated: true, completion: nil)
 }
 }
 
 func updateAnimator(_ percentage: CGFloat) {
 self.animator?.update(percentage)
 }
 
 func cancelAnimator(_ percentage: CGFloat, velocity: CGFloat) {
 if percentage < 0.3 && velocity < 300 {
 self.animator?.cancel()
 }else {
 self.animator?.finish()
 }
 }
 
}

//
// Animator.swift
// PratiseSwift
//
// Created by EugeneLaw on 2018/7/31.
// Copyright © 2018年 EugeneLaw. All rights reserved.
//
 
import UIKit
 
let DRAWER_ANIMATION_TIME = 0.3
 
class Animator: UIPercentDrivenInteractiveTransition, UIViewControllerTransitioningDelegate, UIViewControllerAnimatedTransitioning {
 
 /**是否交互轉(zhuǎn)場*/
 var interative = false
 var showDrawer = false
 var base: UIViewController?
 var drawer:UIViewController?
 /**主頁面在抽屜顯示時保留的寬度*/
 var baseWidth: CGFloat = 100
 lazy var mask = { () -> UIButton in
 let mask = UIButton()
 mask.addTarget(self, action: #selector(maskClicked(_:)), for: .touchUpInside)
 return mask
 }()
 
 init(base: UIViewController, drawer: UIViewController) {
 super.init()
 self.base = base
 self.drawer = drawer
 UIDevice.current.beginGeneratingDeviceOrientationNotifications()
 NotificationCenter.default.addObserver(self, selector: #selector(observeDeviceOrientation(_:)), name: .UIDeviceOrientationDidChange, object: nil)
 }
 
 @objc func observeDeviceOrientation(_ notification: NSObject) {
 if let superView = self.base?.view.superview {
 if showDrawer {
 self.base?.view.snp.remakeConstraints({ (make) in
 make.width.equalTo(SCREEN_WIDTH)
 make.left.equalTo(superView.snp.right).offset(-self.baseWidth)
 make.top.bottom.equalTo(superView)
 })
 }else {
 self.base?.view.snp.remakeConstraints({ (make) in
 make.edges.equalTo(superView)
 })
 }
 superView.layoutIfNeeded()
 }
 }
 
 deinit {
 NotificationCenter.default.removeObserver(self)
 }
 
}
 
extension Animator {
 
 func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
 if showDrawer {
 let fromView = transitionContext.view(forKey: .from)
 addShadowToView(fromView!, color: .black, offset: CGSize(width: -1, height: 0), radius: 3, opacity: 0.1)
 let toView = transitionContext.view(forKey: .to)
 let containerView = transitionContext.containerView
 containerView.addSubview(toView!)
 containerView.addSubview(fromView!)
 fromView?.snp.remakeConstraints({ (make) in
 make.edges.equalTo(containerView)
 })
 toView?.snp.remakeConstraints({ (make) in
 make.edges.equalTo(containerView)
 })
 containerView.layoutIfNeeded()
 UIView.animate(withDuration: DRAWER_ANIMATION_TIME, animations: {
 fromView?.snp.remakeConstraints({ (make) in
 make.left.equalTo((toView?.snp.right)!).offset(-self.baseWidth)
 make.width.top.bottom.equalTo(toView!)
 })
 containerView.layoutIfNeeded()
 }) { (finish) in
 let cancel = transitionContext.transitionWasCancelled
 transitionContext.completeTransition(!cancel)
 if !cancel {//取消狀態(tài)下區(qū)分添加到哪一個父視圖，弄錯會導致黑屏
 if self.drawer?.view.superview != nil {
 self.drawer?.view?.snp.remakeConstraints({ (make) in
 make.edges.equalTo((self.drawer?.view?.superview)!)
 })
 }
 self.showPartOfView()
 }else {
 fromView?.snp.remakeConstraints({ (make) in
 make.edges.equalTo((fromView?.superview)!)
 })
 }
 }
 }else {
 let fromView = transitionContext.view(forKey: .from)
 let toView = transitionContext.view(forKey: .to)
 addShadowToView(toView!, color: .black, offset: CGSize(width: -1, height: 0), radius: 3, opacity: 0.1)
 let containerView = transitionContext.containerView
 containerView.addSubview(fromView!)
 containerView.addSubview(toView!)
 fromView?.snp.remakeConstraints({ (make) in
 make.edges.equalTo(containerView)
 })
 toView?.snp.remakeConstraints({ (make) in
 make.left.equalTo(containerView.snp.right).offset(-self.baseWidth)
 make.width.equalTo(SCREEN_WIDTH)
 make.height.equalTo(SCREEN_HEIGHT)
 make.top.bottom.equalTo(containerView)
 })
 containerView.layoutIfNeeded()
 UIView.animate(withDuration: DRAWER_ANIMATION_TIME, animations: {
 toView?.snp.remakeConstraints({ (make) in
 make.edges.equalTo(containerView)
 })
 containerView.layoutIfNeeded()
 }) { (finish) in
 let cancel = transitionContext.transitionWasCancelled
 transitionContext.completeTransition(!cancel)
 toView?.snp.remakeConstraints({ (make) in
 make.edges.equalTo((toView?.superview)!)
 })
 if minX((self.base?.view)!) <= 0 {//判斷結(jié)束時候是否回到主視圖
 self.base?.view.isUserInteractionEnabled = true
 }
 }
 }
 }
 
 func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
 return DRAWER_ANIMATION_TIME
 }
 
 override func startInteractiveTransition(_ transitionContext: UIViewControllerContextTransitioning) {
 super.startInteractiveTransition(transitionContext)
 }
 
 func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
 self.showDrawer = true
 return self
 }
 
 func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
 self.showDrawer = false
 return self
 }
 
 func interactionControllerForPresentation(using animator: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning? {
 if interative {
 return self
 }else {
 return nil
 }
 }
 
 func interactionControllerForDismissal(using animator: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning? {
 if interative {
 return self
 }else {
 return nil
 }
 }
 
}
 
 
extension Animator {
 
 func showPartOfView() {
 self.drawer?.view.addSubview((self.base?.view)!)
 self.base?.view.snp.remakeConstraints({ (make) in
 make.left.equalTo((self.drawer?.view.snp.right)!).offset(-self.baseWidth)
 make.top.bottom.equalTo((self.drawer?.view)!)
 make.width.equalTo(SCREEN_WIDTH)
 })
 //遮罩
 self.drawer?.view.insertSubview(mask, aboveSubview: (self.base?.view)!)
 self.base?.view.isUserInteractionEnabled = false//阻止交互
 mask.snp.remakeConstraints { (make) in
 make.left.equalTo((mask.superview?.snp.right)!).offset(-baseWidth)
 make.top.width.bottom.equalTo(mask.superview!);
 }
 self.drawer?.view.superview?.layoutIfNeeded()
 }
 
 @objc func maskClicked(_ button: UIButton) {
 button.removeFromSuperview()
 self.drawer?.dismiss(animated: true, completion: nil)
 }
 
}

按鈕調(diào)用例子：（手勢控制已經(jīng)自動添加到主控制器和抽屜控制器的view上）

創(chuàng)建推出抽屜的控制類，參數(shù)分別是主控制器和抽屜控制器。在我自己的練習工程中，把這個控制類定義為總控制器（包括了導航控制器和標簽控制器的控制類）的一個屬性。創(chuàng)建這個抽屜控制類的時候，我把導航控制器（它的root是標簽控制器）當做主控制器傳給第一個參數(shù)。 

self.drawer = DrawerControl(base: self.navigation!, drawer: self.drawerPage)

調(diào)用的時候只需要使用抽屜控制類的show方法即可，練習工程中我把該按鈕封裝在導航菜單里面，它響應(yīng)的時候會調(diào)用總控制器的單例，調(diào)用單例記錄的抽屜控制器屬性。

@objc func btnMenuClicked(_ button: UIButton) {
 TotalControl.instance().drawer?.show()
}

附錄：用到的一些變量

//
// Headers.swift
// PratiseSwift
//
// Created by EugeneLaw on 2018/7/23.
// Copyright © 2018年 EugeneLaw. All rights reserved.
//
 
import UIKit
 
//MARK: 設(shè)備
let isRetina = (UIScreen.instancesRespond(to: #selector(getter: UIScreen.currentMode)) ? __CGSizeEqualToSize(CGSize(width: 640, height: 960), (UIScreen.main.currentMode?.size)!) : false)
let iPhone5 = (UIScreen.instancesRespond(to: #selector(getter: UIScreen.currentMode)) ? __CGSizeEqualToSize(CGSize(width: 640, height: 1136), (UIScreen.main.currentMode?.size)!) : false)
let iPhone6 = (UIScreen.instancesRespond(to: #selector(getter: UIScreen.currentMode)) ? __CGSizeEqualToSize(CGSize(width: 750, height: 1334), (UIScreen.main.currentMode?.size)!) : false)
let iPhone6Plus = (UIScreen.instancesRespond(to: #selector(getter: UIScreen.currentMode)) ? __CGSizeEqualToSize(CGSize(width: 1242, height: 2208), (UIScreen.main.currentMode?.size)!) : false)
let isPad = (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiom.pad)
let isPhone = (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiom.phone)
let isiPhoneX = (UIScreen.instancesRespond(to: #selector(getter: UIScreen.currentMode)) ? __CGSizeEqualToSize(CGSize(width: 1125, height: 2436), (UIScreen.main.currentMode?.size)!) : false)
 
//MARK: 界面
let TABBAR_HEIGHT = (isiPhoneX ? 83 : 49)
let NAVIGATION_HEIGHT = (isiPhoneX ? 88 : 64)
var SCREEN_WIDTH: CGFloat {
 get {
 return SCREEN_WIDTH_FUNC()
 }
}
var SCREEN_HEIGHT: CGFloat {
 get {
 return SCREEN_HEIGHT_FUNC()
 }
}
 
func SCREEN_WIDTH_FUNC() -> CGFloat {
 return UIScreen.main.bounds.size.width
}
 
func SCREEN_HEIGHT_FUNC() -> CGFloat {
 return UIScreen.main.bounds.size.height
}
 
//MARK: 顏色
let COLOR_WHITESMOKE = ColorHex("#F5F5F5")
 
/**
 *十六進制顏色值轉(zhuǎn)換成UIColor
 *@param "#000000"
 */
func ColorHex(_ color: String) -> UIColor? {
 if color.count <= 0 || color.count != 7 || color == "(null)" || color == "<null>" {
 return nil
 }
 var red: UInt32 = 0x0
 var green: UInt32 = 0x0
 var blue: UInt32 = 0x0
 let redString = String(color[color.index(color.startIndex, offsetBy: 1)...color.index(color.startIndex, offsetBy: 2)])
 let greenString = String(color[color.index(color.startIndex, offsetBy: 3)...color.index(color.startIndex, offsetBy: 4)])
 let blueString = String(color[color.index(color.startIndex, offsetBy: 5)...color.index(color.startIndex, offsetBy: 6)])
 Scanner(string: redString).scanHexInt32(&red)
 Scanner(string: greenString).scanHexInt32(&green)
 Scanner(string: blueString).scanHexInt32(&blue)
 let hexColor = UIColor.init(red: CGFloat(red)/255.0, green: CGFloat(green)/255.0, blue: CGFloat(blue)/255.0, alpha: 1)
 return hexColor
}
 
/**
 *給圖層添加陰影
 */
func addShadowToView(_ view: UIView, color: UIColor, offset: CGSize, radius: CGFloat, opacity: Float) {
 view.layer.shadowColor = color.cgColor
 view.layer.shadowOffset = offset
 view.layer.shadowOpacity = opacity
 view.layer.shadowRadius = radius
}
 
/**
 *計算圖層的寬度
 */
func width(_ object: UIView) -> CGFloat {
 return object.frame.width
}
 
/**
 *在父視圖中的x坐標
 */
func minX(_ object: UIView) -> CGFloat {
 return object.frame.origin.x
}
 
/**
 *在父視圖中的x坐標+自身寬度
 */
func maxX(_ object: UIView) -> CGFloat {
 return object.frame.origin.x+width(object)
}
 
/**
 *在父視圖中的y坐標
 */
func minY(_ object: UIView) -> CGFloat {
 return object.frame.origin.y
}
 
/**
 *在父視圖中的y坐標+自身高度
 */
func maxY(_ object: UIView) -> CGFloat {
 return object.frame.origin.y+height(object)
}
 
/**
 *計算圖層的高度
 */
func height(_ object: UIView) -> CGFloat {
 return object.frame.height
}

以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持我們。

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