240 lines
11 KiB
Swift
240 lines
11 KiB
Swift
//
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// MVMCoreUIThreeLayerViewController.swift
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// MVMCoreUI
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//
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// Created by Scott Pfeil on 2/13/19.
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// Copyright © 2019 Verizon Wireless. All rights reserved.
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//
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// This class has three views, a top, middle, and bottom. The top view is just the first view in the scrollview. The middle can be aligned center, top, or bottom depending on if spaceBetweenTopAndMiddle() or spaceBetweenMiddleAndBottom() return values. The bottom view, if inside the scrollview, appears pinned to the bottom unless content pushes it off the screen. If outside the scroll, it's pinned to the bottom under the scrollview.
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import UIKit
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open class ThreeLayerViewController: ProgrammaticScrollViewController, RotorViewElementsProtocol {
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// The three main views
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public var topView: UIView?
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public var middleView: UIView?
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public var bottomView: UIView?
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var useMargins: Bool = false
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// The top view can be put outside of the scrolling area.
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var topViewOutsideOfScroll = false
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// The bottom view can be put outside of the scrolling area.
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var bottomViewOutsideOfScroll = false
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var heightConstraint: NSLayoutConstraint?
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open override func updateViews() {
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super.updateViews()
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let width = view.bounds.width
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MFStyler.setDefaultMarginsFor(contentView, size: width)
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if let topView = topView as? MVMCoreViewProtocol {
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topView.updateView(width)
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}
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if let middleView = middleView as? MVMCoreViewProtocol {
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middleView.updateView(width)
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}
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if let bottomView = bottomView as? MVMCoreViewProtocol {
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bottomView.updateView(width)
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}
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}
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open override func loadView() {
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super.loadView()
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// The height is used to keep the bottom view at the bottom.
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if let contentView = contentView, let scrollView = scrollView {
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heightConstraint = contentView.heightAnchor.constraint(equalTo: scrollView.safeAreaLayoutGuide.heightAnchor, multiplier: 1.0)
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heightConstraint?.priority = UILayoutPriority.defaultLow
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}
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}
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open override func handleNewData() {
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super.handleNewData()
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// Removes the views
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topView?.removeFromSuperview()
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middleView?.removeFromSuperview()
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bottomView?.removeFromSuperview()
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if let subViews = contentView?.subviews {
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for view in subViews {
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view.removeFromSuperview()
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}
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}
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// Reset constraints
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topConstraint?.isActive = true
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bottomConstraint?.isActive = true
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heightConstraint?.isActive = false
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setupLayers()
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}
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//MARK:-Functions to subclass
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// Subclass for a top view.
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open func viewForTop() -> UIView? {
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return nil
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}
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// Subclass for a middle view.
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open func viewForMiddle() -> UIView? {
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return nil
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}
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// Subclass for a bottom view.
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open func viewForBottom() -> UIView? {
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return nil
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}
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// If a value is set, the middle view is pinned this value below the top view, if not, space is left to fill.
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open func spaceBetweenTopAndMiddle() -> CGFloat? {
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return nil
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}
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// If a value is set, the middle view is pinned this value above the bottom view, if not, space is left to fill.
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open func spaceBetweenMiddleAndBottom() -> CGFloat? {
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return nil
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}
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}
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//MARK:-Setup
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extension ThreeLayerViewController {
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func setupViewAsTop() -> UIView {
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var topView = viewForTop() ?? MVMCoreUICommonViewsUtility.getView(with: 0)
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self.topView = topView
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// Adds the top view outside the scroll if directed.
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if topViewOutsideOfScroll {
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topConstraint?.isActive = false
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addViewOutsideOfScrollViewTop(topView)
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// Adds and returns an empty view to use for the internal logic.
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topView = MVMCoreUICommonViewsUtility.getView(with: 0)
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addViewInsideOfScrollViewTop(topView)
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} else {
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topConstraint?.isActive = true
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addViewInsideOfScrollViewTop(topView)
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}
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return topView
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}
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func setupViewAsMiddle() -> UIView {
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let middleView = viewForMiddle() ?? MVMCoreUICommonViewsUtility.getView(with: 0)
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self.middleView = middleView
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guard let contentView = contentView else { return middleView }
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contentView.addSubview(middleView)
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NSLayoutConstraint.pinViewLeft(toSuperview: middleView, useMargins: useMargins, constant: 0).isActive = true
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NSLayoutConstraint.pinViewRight(toSuperview: middleView, useMargins: useMargins, constant: 0).isActive = true
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middleView.setContentHuggingPriority(UILayoutPriority.required, for: NSLayoutConstraint.Axis.vertical)
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return middleView
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}
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func setupViewAsBottom() -> UIView {
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var bottomView = viewForBottom() ?? MVMCoreUICommonViewsUtility.getView(with: 0)
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self.bottomView = bottomView
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// Adds the bottom view outside the scroll if directed.
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if bottomViewOutsideOfScroll {
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bottomConstraint?.isActive = false
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addViewOutsideOfScrollViewBottom(bottomView)
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// Adds and returns an empty view to use for the internal logic.
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bottomView = MVMCoreUICommonViewsUtility.getView(with: 0)
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addViewInsideOfScrollViewBottom(bottomView)
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} else {
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bottomConstraint?.isActive = true
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addViewInsideOfScrollViewBottom(bottomView)
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}
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return bottomView
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}
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func setupLayers() {
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guard let contentView = contentView else { return }
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let topView = setupViewAsTop()
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let middleView = setupViewAsMiddle()
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let bottomView = setupViewAsBottom()
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let spaceAbove = spaceBetweenTopAndMiddle()
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let spaceBelow = spaceBetweenMiddleAndBottom()
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if let spaceAbove = spaceAbove, let spaceBelow = spaceBelow {
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// Both top and bottom space set, buttons not pinned to bottom.
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middleView.topAnchor.constraint(equalTo: topView.bottomAnchor, constant: spaceAbove).isActive = true
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bottomView.topAnchor.constraint(equalTo: middleView.bottomAnchor, constant: spaceBelow).isActive = true
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} else {
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heightConstraint?.isActive = true
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if let spaceAbove = spaceAbove {
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// Space above is set, space below is free.
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let bottomSpacer = MVMCoreUICommonViewsUtility.commonView()
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contentView.addSubview(bottomSpacer)
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bottomSpacer.leftAnchor.constraint(equalTo: contentView.leftAnchor).isActive = true
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contentView.rightAnchor.constraint(equalTo: bottomSpacer.rightAnchor).isActive = true
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bottomSpacer.heightAnchor.constraint(greaterThanOrEqualToConstant: 0).isActive = true
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middleView.topAnchor.constraint(equalTo: topView.bottomAnchor, constant: spaceAbove).isActive = true
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bottomSpacer.topAnchor.constraint(equalTo: middleView.bottomAnchor).isActive = true
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bottomView.topAnchor.constraint(equalTo: bottomSpacer.bottomAnchor).isActive = true
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} else if let spaceBelow = spaceBelow {
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// Space below is set, space above is free.
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let topSpacer = MVMCoreUICommonViewsUtility.commonView()
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contentView.addSubview(topSpacer)
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topSpacer.leftAnchor.constraint(equalTo: contentView.leftAnchor).isActive = true
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contentView.rightAnchor.constraint(equalTo: topSpacer.rightAnchor).isActive = true
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topSpacer.heightAnchor.constraint(greaterThanOrEqualToConstant: 0).isActive = true
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topSpacer.topAnchor.constraint(equalTo: topView.bottomAnchor).isActive = true
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middleView.topAnchor.constraint(equalTo: topSpacer.bottomAnchor).isActive = true
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bottomView.topAnchor.constraint(equalTo: middleView.bottomAnchor, constant: spaceBelow).isActive = true
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} else {
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// No set space above or below, make the spacers the same height with a default minimum.
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let topSpacer = MVMCoreUICommonViewsUtility.commonView()
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let bottomSpacer = MVMCoreUICommonViewsUtility.commonView()
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contentView.addSubview(topSpacer)
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contentView.addSubview(bottomSpacer)
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topSpacer.leftAnchor.constraint(equalTo: contentView.leftAnchor).isActive = true
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contentView.rightAnchor.constraint(equalTo: topSpacer.rightAnchor).isActive = true
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bottomSpacer.leftAnchor.constraint(equalTo: contentView.leftAnchor).isActive = true
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contentView.rightAnchor.constraint(equalTo: bottomSpacer.rightAnchor).isActive = true
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topSpacer.heightAnchor.constraint(equalTo: bottomSpacer.heightAnchor).isActive = true
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topSpacer.heightAnchor.constraint(greaterThanOrEqualToConstant: 0).isActive = true
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topSpacer.topAnchor.constraint(equalTo: topView.bottomAnchor).isActive = true
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middleView.topAnchor.constraint(equalTo: topSpacer.bottomAnchor).isActive = true
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bottomSpacer.topAnchor.constraint(equalTo: middleView.bottomAnchor).isActive = true
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bottomView.topAnchor.constraint(equalTo: bottomSpacer.bottomAnchor).isActive = true
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}
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}
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}
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func addViewInsideOfScrollViewTop(_ view: UIView) {
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guard let contentView = contentView else { return }
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contentView.addSubview(view)
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NSLayoutConstraint.pinViewTop(toSuperview: view, useMargins: useMargins, constant: 0).isActive = true
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NSLayoutConstraint.pinViewLeft(toSuperview: view, useMargins: useMargins, constant: 0).isActive = true
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NSLayoutConstraint.pinViewRight(toSuperview: view, useMargins: useMargins, constant: 0).isActive = true
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}
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func addViewOutsideOfScrollViewTop(_ view: UIView) {
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guard let scrollView = scrollView, let parentView = self.view else { return }
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parentView.addSubview(view)
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scrollView.topAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
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NSLayoutConstraint.pinViewLeft(toSuperview: view, useMargins: useMargins, constant: 0).isActive = true
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NSLayoutConstraint.pinViewRight(toSuperview: view, useMargins: useMargins, constant: 0).isActive = true
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view.topAnchor.constraint(equalTo: parentView.safeAreaLayoutGuide.topAnchor).isActive = true
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}
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func addViewInsideOfScrollViewBottom(_ view: UIView) {
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guard let contentView = contentView else { return }
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contentView.addSubview(view);
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NSLayoutConstraint.pinViewLeft(toSuperview: view, useMargins: useMargins, constant: 0).isActive = true
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NSLayoutConstraint.pinViewRight(toSuperview: view, useMargins: useMargins, constant: 0).isActive = true
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NSLayoutConstraint.pinViewBottom(toSuperview: view, useMargins: useMargins, constant: 0).isActive = true
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}
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func addViewOutsideOfScrollViewBottom(_ view: UIView) {
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guard let scrollView = scrollView, let parentView = self.view else { return }
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parentView.addSubview(view)
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view.topAnchor.constraint(equalTo: scrollView.bottomAnchor).isActive = true
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NSLayoutConstraint.pinViewLeft(toSuperview: view, useMargins: useMargins, constant: 0).isActive = true
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NSLayoutConstraint.pinViewRight(toSuperview: view, useMargins: useMargins, constant: 0).isActive = true
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parentView.safeAreaLayoutGuide.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
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}
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}
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