LTAdvancedManager.swift
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//
// LTAdvancedManager.swift
// LTScrollView_Example
//
// Created by 高刘通 on 2018/2/6.
// Copyright © 2018年 CocoaPods. All rights reserved.
//
import UIKit
@objc public protocol LTAdvancedScrollViewDelegate: class {
@objc optional func glt_scrollViewOffsetY(_ offsetY: CGFloat)
}
public class LTAdvancedManager: UIView {
public typealias LTAdvancedDidSelectIndexHandle = (Int) -> Void
@objc public var advancedDidSelectIndexHandle: LTAdvancedDidSelectIndexHandle?
@objc public weak var delegate: LTAdvancedScrollViewDelegate?
//设置悬停位置Y值
@objc public var hoverY: CGFloat = 0
/* 点击切换滚动过程动画 */
@objc public var isClickScrollAnimation = false {
didSet {
titleView.isClickScrollAnimation = isClickScrollAnimation
}
}
/* 代码设置滚动到第几个位置 */
@objc public func scrollToIndex(index: Int) {
pageView.scrollToIndex(index: index)
}
private var kHeaderHeight: CGFloat = 0.0
private var currentSelectIndex: Int = 0
private var lastDiffTitleToNav:CGFloat = 0.0
private var headerView: UIView?
private var viewControllers: [UIViewController]
private var titles: [String]
private weak var currentViewController: UIViewController?
private var pageView: LTPageView!
private var layout: LTLayout
var isCustomTitleView: Bool = false
private var titleView: LTPageTitleView!
@objc public init(frame: CGRect, viewControllers: [UIViewController], titles: [String], currentViewController: UIViewController, layout: LTLayout, titleView: LTPageTitleView? = nil, headerViewHandle handle: () -> UIView) {
UIScrollView.initializeOnce()
UICollectionViewFlowLayout.loadOnce()
self.viewControllers = viewControllers
self.titles = titles
self.currentViewController = currentViewController
self.layout = layout
super.init(frame: frame)
UICollectionViewFlowLayout.glt_sliderHeight = layout.sliderHeight
layout.isSinglePageView = true
if titleView != nil {
isCustomTitleView = true
self.titleView = titleView!
} else {
self.titleView = setupTitleView()
}
pageView = setupPageViewConfig(currentViewController: currentViewController, layout: layout)
setupSubViewsConfig(handle)
}
deinit {
deallocConfig()
}
required public init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
extension LTAdvancedManager {
private func setupTitleView() -> LTPageTitleView {
let titleView = LTPageTitleView(frame: CGRect(x: 0, y: 0, width: bounds.width, height: layout.sliderHeight), titles: titles, layout: layout)
return titleView
}
}
extension LTAdvancedManager {
//MARK: 创建PageView
private func setupPageViewConfig(currentViewController:UIViewController, layout: LTLayout) -> LTPageView {
let pageView = LTPageView(frame: self.bounds, currentViewController: currentViewController, viewControllers: viewControllers, titles: titles, layout:layout)
if titles.count != 0 {
pageView.glt_createViewController(0)
}
DispatchQueue.main.after(0.01) {
pageView.addSubview(self.titleView)
pageView.makeupPageView(pageView, self.titleView)
}
return pageView
}
}
extension LTAdvancedManager {
private func setupSubViewsConfig(_ handle: () -> UIView) {
let headerView = handle()
kHeaderHeight = headerView.bounds.height
self.headerView = headerView
lastDiffTitleToNav = kHeaderHeight
setupSubViews()
addSubview(headerView)
}
private func setupSubViews() {
titleView.frame.origin.y = kHeaderHeight
backgroundColor = UIColor.white
addSubview(pageView)
setupPageViewDidSelectItem()
setupFirstAddChildViewController()
guard let viewController = viewControllers.first else { return }
self.contentScrollViewScrollConfig(viewController)
scrollInsets(viewController, kHeaderHeight+layout.sliderHeight)
}
}
extension LTAdvancedManager {
//设置ScrollView的contentInset
private func scrollInsets(_ currentVC: UIViewController ,_ up: CGFloat) {
currentVC.glt_scrollView?.contentInset = UIEdgeInsets(top: up, left: 0, bottom: 49, right: 0)
currentVC.glt_scrollView?.scrollIndicatorInsets = UIEdgeInsets(top: up, left: 0, bottom: 0, right: 0)
}
//MARK: 首次创建pageView的ChildVC回调
private func setupFirstAddChildViewController() {
//首次创建pageView的ChildVC回调
pageView.addChildVcBlock = {[weak self] in
guard let `self` = self else { return }
let currentVC = self.viewControllers[$0]
//设置ScrollView的contentInset
self.scrollInsets(currentVC, self.kHeaderHeight+self.layout.sliderHeight)
// self.scrollInsets(currentVC, 100)
//初始化滚动回调 首次加载并不会执行内部方法
self.contentScrollViewScrollConfig($1)
//注意:节流---否则此方法无效。。
self.setupFirstAddChildScrollView()
}
}
func glt_adjustScrollViewContentSizeHeight(glt_scrollView: UIScrollView?) {
// guard let glt_scrollView = glt_scrollView else { return }
// //当前ScrollView的contentSize的高 = 当前ScrollView的的高 避免自动掉落
// let sliderH = self.layout.sliderHeight
// if glt_scrollView.contentSize.height < glt_scrollView.bounds.height - sliderH {
// glt_scrollView.contentSize.height = glt_scrollView.bounds.height - sliderH
// }
}
//MARK: 首次创建pageView的ChildVC回调 自适应调节
private func setupFirstAddChildScrollView() {
//注意:节流---否则此方法无效。。
DispatchQueue.main.after(0.01, execute: {
let currentVC = self.viewControllers[self.currentSelectIndex]
guard let glt_scrollView = currentVC.glt_scrollView else { return }
self.glt_adjustScrollViewContentSizeHeight(glt_scrollView: glt_scrollView)
glt_scrollView.contentOffset.y = self.distanceBottomOffset()
/*
//当前ScrollView的contentSize的高
let contentSizeHeight = glt_scrollView.contentSize.height
//当前ScrollView的的高
let boundsHeight = glt_scrollView.bounds.height - self.layout.sliderHeight
//此处说明内容的高度小于bounds 应该让pageTitleView自动回滚到初始位置
if contentSizeHeight < boundsHeight {
//为自动掉落加一个动画
UIView.animate(withDuration: 0.12, animations: {
//初始的偏移量 即初始的contentInset的值
let offsetPoint = CGPoint(x: 0, y: -self.kHeaderHeight-self.layout.sliderHeight)
//注意:此处调用此方法并不会执行scrollViewDidScroll:原因未可知
glt_scrollView.setContentOffset(offsetPoint, animated: true)
//在这里手动执行一下scrollViewDidScroll:事件
self.setupGlt_scrollViewDidScroll(scrollView: glt_scrollView, currentVC: currentVC)
})
}else {
//首次初始化,通过改变当前ScrollView的偏移量,来确保ScrollView正好在pageTitleView下方
glt_scrollView.contentOffset.y = self.distanceBottomOffset()
}
*/
})
}
//MARK: 当前的scrollView滚动的代理方法开始
private func contentScrollViewScrollConfig(_ viewController: UIViewController) {
viewController.glt_scrollView?.scrollHandle = {[weak self] scrollView in
guard let `self` = self else { return }
let currentVC = self.viewControllers[self.currentSelectIndex]
guard currentVC.glt_scrollView == scrollView else { return }
self.glt_adjustScrollViewContentSizeHeight(glt_scrollView: currentVC.glt_scrollView)
self.setupGlt_scrollViewDidScroll(scrollView: scrollView, currentVC: currentVC)
}
}
//MARK: 当前控制器的滑动方法事件处理 1
private func setupGlt_scrollViewDidScroll(scrollView: UIScrollView, currentVC: UIViewController) {
//pageTitleView距离屏幕顶部到pageTitleView最底部的距离
let distanceBottomOffset = self.distanceBottomOffset()
//当前控制器上一次的偏移量
let glt_upOffsetString = currentVC.glt_upOffset ?? String(describing: distanceBottomOffset)
//先转化为Double(String转CGFloat步骤:String -> Double -> CGFloat)
let glt_upOffsetDouble = Double(glt_upOffsetString) ?? Double(distanceBottomOffset)
//再转化为CGFloat
let glt_upOffset = CGFloat(glt_upOffsetDouble)
//计算上一次偏移和当前偏移量y的差值
let absOffset = scrollView.contentOffset.y - glt_upOffset
//处理滚动
self.contentScrollViewDidScroll(scrollView, absOffset)
//记录上一次的偏移量
currentVC.glt_upOffset = String(describing: scrollView.contentOffset.y)
}
//MARK: 当前控制器的滑动方法事件处理 2
private func contentScrollViewDidScroll(_ contentScrollView: UIScrollView, _ absOffset: CGFloat) {
//获取当前控制器
let currentVc = viewControllers[currentSelectIndex]
//外部监听当前ScrollView的偏移量
self.delegate?.glt_scrollViewOffsetY?((currentVc.glt_scrollView?.contentOffset.y ?? kHeaderHeight) + self.kHeaderHeight + layout.sliderHeight)
//获取偏移量
let offsetY = contentScrollView.contentOffset.y
//获取当前pageTitleView的Y值
var pageTitleViewY = titleView.frame.origin.y
//pageTitleView从初始位置上升的距离
let titleViewBottomDistance = offsetY + kHeaderHeight + layout.sliderHeight
let headerViewOffset = titleViewBottomDistance + pageTitleViewY
if absOffset > 0 && titleViewBottomDistance > 0 {//向上滑动
if headerViewOffset >= kHeaderHeight {
pageTitleViewY += -absOffset
if pageTitleViewY <= hoverY {
pageTitleViewY = hoverY
}
}
}else{//向下滑动
if headerViewOffset < kHeaderHeight {
pageTitleViewY = -titleViewBottomDistance + kHeaderHeight
if pageTitleViewY >= kHeaderHeight {
pageTitleViewY = kHeaderHeight
}
}
}
titleView.frame.origin.y = pageTitleViewY
headerView?.frame.origin.y = pageTitleViewY - kHeaderHeight
let lastDiffTitleToNavOffset = pageTitleViewY - lastDiffTitleToNav
lastDiffTitleToNav = pageTitleViewY
//使其他控制器跟随改变
for subVC in viewControllers {
glt_adjustScrollViewContentSizeHeight(glt_scrollView: subVC.glt_scrollView)
guard subVC != currentVc else { continue }
guard let vcGlt_scrollView = subVC.glt_scrollView else { continue }
vcGlt_scrollView.contentOffset.y += (-lastDiffTitleToNavOffset)
subVC.glt_upOffset = String(describing: vcGlt_scrollView.contentOffset.y)
}
}
private func distanceBottomOffset() -> CGFloat {
return -(titleView.frame.origin.y + layout.sliderHeight)
}
}
extension LTAdvancedManager {
//MARK: pageView选中事件
private func setupPageViewDidSelectItem() {
pageView.didSelectIndexBlock = {[weak self] in
guard let `self` = self else { return }
self.setupUpViewControllerEndRefreshing()
self.currentSelectIndex = $1
self.advancedDidSelectIndexHandle?($1)
self.setupContentSizeBoundsHeightAdjust()
}
}
//MARK: 内容的高度小于bounds 应该让pageTitleView自动回滚到初始位置
private func setupContentSizeBoundsHeightAdjust() {
DispatchQueue.main.after(0.01, execute: {
let currentVC = self.viewControllers[self.currentSelectIndex]
guard let glt_scrollView = currentVC.glt_scrollView else { return }
self.glt_adjustScrollViewContentSizeHeight(glt_scrollView: glt_scrollView)
//当前ScrollView的contentSize的高
let contentSizeHeight = glt_scrollView.contentSize.height
//当前ScrollView的的高
let boundsHeight = glt_scrollView.bounds.height - self.layout.sliderHeight
//此处说明内容的高度小于bounds 应该让pageTitleView自动回滚到初始位置
//这里不用再进行其他操作,因为会调用ScrollViewDidScroll:
if contentSizeHeight < boundsHeight {
let offsetPoint = CGPoint(x: 0, y: -self.kHeaderHeight-self.layout.sliderHeight)
glt_scrollView.setContentOffset(offsetPoint, animated: true)
}
})
}
//MARK: 处理下拉刷新的过程中切换导致的问题
private func setupUpViewControllerEndRefreshing() {
//如果正在下拉,则在切换之前把上一个的ScrollView的偏移量设置为初始位置
DispatchQueue.main.after(0.01) {
let upVC = self.viewControllers[self.currentSelectIndex]
guard let glt_scrollView = upVC.glt_scrollView else { return }
//判断是下拉
if glt_scrollView.contentOffset.y < (-self.kHeaderHeight-self.layout.sliderHeight) {
let offsetPoint = CGPoint(x: 0, y: -self.kHeaderHeight-self.layout.sliderHeight)
glt_scrollView.setContentOffset(offsetPoint, animated: true)
}
}
}
}
extension LTAdvancedManager {
private func deallocConfig() {
for viewController in viewControllers {
viewController.glt_scrollView?.delegate = nil
}
}
}