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Fix issue 82 Gallery crashes if it has only one tab #83

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Fix issue 82 Gallery crashes if it has only one tab #83

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74 changes: 41 additions & 33 deletions Sources/Utils/Pages/PagesController.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -10,8 +10,8 @@ class PagesController: UIViewController {

lazy var scrollView: UIScrollView = self.makeScrollView()
lazy var scrollViewContentView: UIView = UIView()
lazy var pageIndicator: PageIndicator = self.makePageIndicator()

lazy var pageIndicator: PageIndicator? = self.makePageIndicator()
var selectedIndex: Int = 0
let once = Once()

Expand Down Expand Up @@ -74,43 +74,30 @@ class PagesController: UIViewController {

return scrollView
}

func makePageIndicator() -> PageIndicator {
let items = controllers.flatMap { $0.title }
let indicator = PageIndicator(items: items)
indicator.delegate = self

return indicator

func makePageIndicator() -> PageIndicator? {
if shouldUsePageIndicator() {
let items = controllers.flatMap { $0.title }
let indicator = PageIndicator(items: items)
indicator.delegate = self
return indicator
}
return nil
}

// MARK: - Setup

func setup() {
let usePageIndicator = controllers.count > 1
if usePageIndicator {
view.addSubview(pageIndicator)
Constraint.on(
pageIndicator.leftAnchor.constraint(equalTo: pageIndicator.superview!.leftAnchor),
pageIndicator.rightAnchor.constraint(equalTo: pageIndicator.superview!.rightAnchor),
pageIndicator.heightAnchor.constraint(equalToConstant: 40)
)

if #available(iOS 11, *) {
Constraint.on(
pageIndicator.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor)
)
} else {
Constraint.on(
pageIndicator.bottomAnchor.constraint(equalTo: pageIndicator.superview!.bottomAnchor)
)
}
}

view.addSubview(scrollView)
scrollView.addSubview(scrollViewContentView)


if let indicator = pageIndicator {
view.addSubview(indicator)
addConstraintForPageIndicator(indicator)
}

scrollView.g_pinUpward()
if usePageIndicator {
if shouldUsePageIndicator() {
scrollView.g_pin(on: .bottom, view: pageIndicator, on: .top)
} else {
scrollView.g_pinDownward()
Expand Down Expand Up @@ -153,7 +140,7 @@ class PagesController: UIViewController {

fileprivate func scrollToAndSelect(index: Int, animated: Bool) {
scrollTo(index: index, animated: animated)
pageIndicator.select(index: index, animated: animated)
pageIndicator?.select(index: index, animated: animated)
}

func updateAndNotify(_ index: Int) {
Expand All @@ -168,6 +155,26 @@ class PagesController: UIViewController {
controller.pageDidShow()
}
}

private func shouldUsePageIndicator() -> Bool {
return controllers.count > 1
}

private func addConstraintForPageIndicator(_ pageIndicator: PageIndicator) {

Constraint.on(
pageIndicator.leftAnchor.constraint(equalTo: pageIndicator.superview!.leftAnchor),
pageIndicator.rightAnchor.constraint(equalTo: pageIndicator.superview!.rightAnchor),
pageIndicator.heightAnchor.constraint(equalToConstant: 40)
)

if #available(iOS 11, *) {
Constraint.on(pageIndicator.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor))
} else {
Constraint.on(pageIndicator.bottomAnchor.constraint(equalTo: pageIndicator.superview!.bottomAnchor))
}
}

}

extension PagesController: PageIndicatorDelegate {
Expand All @@ -182,7 +189,8 @@ extension PagesController: UIScrollViewDelegate {

func scrollViewDidScroll(_ scrollView: UIScrollView) {
let index = Int(round(scrollView.contentOffset.x / scrollView.frame.size.width))
pageIndicator.select(index: index)
pageIndicator?.select(index: index)
updateAndNotify(index)
}
}