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增加一些方法回调，支持外面配置成系统相册的展示效果 #54

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增加一些方法回调，支持外面配置成系统相册的展示效果 #54

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154 changes: 92 additions & 62 deletions Sources/Lantern/Lantern.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -8,112 +8,124 @@

import UIKit

/// 主界面vc
open class Lantern: UIViewController, UIViewControllerTransitioningDelegate, UINavigationControllerDelegate {

/// 通过本回调，把图片浏览器嵌套在导航控制器里
public typealias PresentEmbedClosure = (Lantern) -> UINavigationController

/// 打开方式类型
public enum ShowMethod {
case push(inNC: UINavigationController?)
case present(fromVC: UIViewController?, embed: PresentEmbedClosure?)
}

/// 滑动方向类型
public enum ScrollDirection {
case horizontal
case vertical
}

/// 自实现转场动画
open lazy var transitionAnimator: LanternAnimatedTransitioning = LanternFadeAnimator()

/// 滑动方向
open var scrollDirection: Lantern.ScrollDirection {
set { browserView.scrollDirection = newValue }
get { browserView.scrollDirection }
}

/// 项间距
open var itemSpacing: CGFloat {
set { browserView.itemSpacing = newValue }
get { browserView.itemSpacing }
}

/// 新增更多num之前的数据总量
open var lastNumberOfItems: Int {
set { browserView.lastNumberOfItems = newValue }
get { browserView.lastNumberOfItems }
}

/// 当前页码
open var pageIndex: Int {
set { browserView.pageIndex = newValue }
get { browserView.pageIndex }
}

/// 浏览过程中实时获取数据总量
open var numberOfItems: () -> Int {
set { browserView.numberOfItems = newValue }
get { browserView.numberOfItems }
}

/// 返回可复用的Cell类。用户可根据index返回不同的类。本闭包将在每次复用Cell时实时调用。
open var cellClassAtIndex: (_ index: Int) -> LanternCell.Type {
set { browserView.cellClassAtIndex = newValue }
get { browserView.cellClassAtIndex }
}

/// Cell刷新时用的上下文。index: 刷新的Cell对应的index；currentIndex: 当前显示的页
public typealias ReloadCellContext = (cell: LanternCell, index: Int, currentIndex: Int)

/// 刷新Cell数据。本闭包将在Cell完成位置布局后调用。
open var reloadCellAtIndex: (ReloadCellContext) -> Void {
set { browserView.reloadCellAtIndex = newValue }
get { browserView.reloadCellAtIndex }
}

/// 自然滑动引起的页码改变时回调
open lazy var didChangedPageIndex: (_ index: Int) -> Void = { _ in }

/// Cell将显示
open var cellWillAppear: (LanternCell, Int) -> Void {
set { browserView.cellWillAppear = newValue }
get { browserView.cellWillAppear }
}

/// Cell将不显示
open var cellWillDisappear: (LanternCell, Int) -> Void {
set { browserView.cellWillDisappear = newValue }
get { browserView.cellWillDisappear }
}

/// Cell已显示
open var cellDidAppear: (LanternCell, Int) -> Void {
set { browserView.cellDidAppear = newValue }
get { browserView.cellDidAppear }
}

/// 主视图
open lazy var browserView = LanternView()

/// 页码指示
open var pageIndicator: LanternPageIndicator?

/// 背景蒙版
open lazy var maskView: UIView = {
let view = UIView()
view.backgroundColor = .black
return view
}()


/// 导航条是否隐藏，默认为true
open var isNavigationBarHidden = true

/// 上面的导航条和下面的toolbar是否隐藏
open var isMenuHidden: Bool = false {
didSet {
self.navigationController?.setNavigationBarHidden(isMenuHidden, animated: true)
self.navigationController?.setToolbarHidden(isMenuHidden, animated: true)
}
}

open weak var previousNavigationControllerDelegate: UINavigationControllerDelegate?

deinit {
LanternLog.high("deinit - \(self.classForCoder)")
navigationController?.delegate = previousNavigationControllerDelegate
}

/// 显示图片浏览器
open func show(method: ShowMethod = .present(fromVC: nil, embed: nil)) {
switch method {
Expand All @@ -124,14 +136,14 @@ open class Lantern: UIViewController, UIViewControllerTransitioningDelegate, UIN
nav?.pushViewController(self, animated: true)
case .present(let fromVC, let embed):
let toVC = embed?(self) ?? self
toVC.modalPresentationStyle = .custom
toVC.modalPresentationStyle = .overFullScreen
toVC.modalPresentationCapturesStatusBarAppearance = true
toVC.transitioningDelegate = self
let from = fromVC ?? Lantern.topMost
from?.present(toVC, animated: true, completion: nil)
}
}

/// 刷新
open func reloadData() {
// 图片数量为0时，移除
Expand All @@ -142,42 +154,42 @@ open class Lantern: UIViewController, UIViewControllerTransitioningDelegate, UIN
browserView.reloadData()
pageIndicator?.reloadData(numberOfItems: numberOfItems(), pageIndex: pageIndex)
}

open override func viewDidLoad() {
super.viewDidLoad()

automaticallyAdjustsScrollViewInsets = false
hideNavigationBar(true)

browserView.lantern = self
transitionAnimator.lantern = self

view.backgroundColor = .clear
view.addSubview(maskView)
view.addSubview(browserView)

browserView.didChangedPageIndex = { [weak self] index in
guard let `self` = self else { return }
self.pageIndicator?.didChanged(pageIndex: index)
self.didChangedPageIndex(index)
}

view.setNeedsLayout()
view.layoutIfNeeded()
}

open override func viewWillLayoutSubviews() {
super.viewWillLayoutSubviews()
maskView.frame = view.bounds
browserView.frame = view.bounds
pageIndicator?.reloadData(numberOfItems: numberOfItems(), pageIndex: pageIndex)
}

open override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
hideNavigationBar(true)
}

open override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
navigationController?.delegate = previousNavigationControllerDelegate
Expand All @@ -186,41 +198,43 @@ open class Lantern: UIViewController, UIViewControllerTransitioningDelegate, UIN
indicator.setup(with: self)
}
}

open override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
hideNavigationBar(false)
}

open override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
super.viewWillTransition(to: size, with: coordinator)
browserView.isRotating = true
}

//
// MARK: - Navigation Bar
//

/// 在PhotoBrowser打开之前，导航栏是否隐藏
open var isPreviousNavigationBarHidden: Bool?

private func hideNavigationBar(_ hide: Bool) {
if hide {
if isPreviousNavigationBarHidden == nil {
isPreviousNavigationBarHidden = navigationController?.isNavigationBarHidden
if isNavigationBarHidden {
if isPreviousNavigationBarHidden == nil {
isPreviousNavigationBarHidden = navigationController?.isNavigationBarHidden
}
// navigationController?.setNavigationBarHidden(true, animated: false)
}
navigationController?.setNavigationBarHidden(true, animated: false)
} else {
if let barHidden = isPreviousNavigationBarHidden {
navigationController?.setNavigationBarHidden(barHidden, animated: false)
// navigationController?.setNavigationBarHidden(barHidden, animated: false)
}
}
}

//
// MARK: - Status Bar
//

private lazy var isPreviousStatusBarHidden: Bool = {
var previousVC: UIViewController?
if let vc = self.presentingViewController {
Expand All @@ -232,13 +246,13 @@ open class Lantern: UIViewController, UIViewControllerTransitioningDelegate, UIN
}
return previousVC?.prefersStatusBarHidden ?? false
}()

private lazy var isStatusBarHidden = self.isPreviousStatusBarHidden

open override var prefersStatusBarHidden: Bool {
return isStatusBarHidden
}

open func setStatusBar(hidden: Bool) {
if hidden {
isStatusBarHidden = true
Expand All @@ -247,32 +261,48 @@ open class Lantern: UIViewController, UIViewControllerTransitioningDelegate, UIN
}
setNeedsStatusBarAppearanceUpdate()
}

//
// MARK: - 转场
//

public func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
transitionAnimator.isForShow = true
transitionAnimator.lantern = self
return transitionAnimator
}

public func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
transitionAnimator.isForShow = false
transitionAnimator.lantern = self
return transitionAnimator
}

public func navigationController(_ navigationController: UINavigationController, animationControllerFor operation: UINavigationController.Operation, from fromVC: UIViewController, to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
transitionAnimator.isForShow = (operation == .push)
transitionAnimator.lantern = self
transitionAnimator.isNavigationAnimation = true
return transitionAnimator
}


/// 拖动图片，背景颜色变化
open var maskAlphaChaged: (_ lantern: Lantern, _ alpha: CGFloat) -> Void = { _,_ in }

/// 点击图片的效果
public enum TapStyle {
case dismiss
case hideNavigationBar
}

/// 单击图片的效果，默认为隐藏视图
open var tapStyle = TapStyle.dismiss

/// 即将消失的事件
open var willDismiss: ((_ lantern: Lantern) -> Void)?

/// 关闭PhotoBrowser
open func dismiss() {
willDismiss?(self)
setStatusBar(hidden: false)
pageIndicator?.removeFromSuperview()
if presentingViewController != nil {
Expand All @@ -282,7 +312,7 @@ open class Lantern: UIViewController, UIViewControllerTransitioningDelegate, UIN
navigationController?.popViewController(animated: true)
}
}

//
// MARK: - 取顶层控制器
//
Expand All @@ -291,38 +321,38 @@ open class Lantern: UIViewController, UIViewControllerTransitioningDelegate, UIN
open class var topMost: UIViewController? {
return topMost(of: UIApplication.shared.keyWindow?.rootViewController)
}

open class func topMost(of viewController: UIViewController?) -> UIViewController? {
// presented view controller
if let presentedViewController = viewController?.presentedViewController {
return self.topMost(of: presentedViewController)
}

// UITabBarController
if let tabBarController = viewController as? UITabBarController,
let selectedViewController = tabBarController.selectedViewController {
let selectedViewController = tabBarController.selectedViewController {
return self.topMost(of: selectedViewController)
}

// UINavigationController
if let navigationController = viewController as? UINavigationController,
let visibleViewController = navigationController.visibleViewController {
let visibleViewController = navigationController.visibleViewController {
return self.topMost(of: visibleViewController)
}

// UIPageController
if let pageViewController = viewController as? UIPageViewController,
pageViewController.viewControllers?.count == 1 {
pageViewController.viewControllers?.count == 1 {
return self.topMost(of: pageViewController.viewControllers?.first)
}

// child view controller
for subview in viewController?.view?.subviews ?? [] {
if let childViewController = subview.next as? UIViewController {
return self.topMost(of: childViewController)
}
}

return viewController
}
}
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