From 736558ed5fd5fab09b5430c9051cb1bc08fa09e0 Mon Sep 17 00:00:00 2001
From: cecipirotto <31603856+cecipirotto@users.noreply.github.com>
Date: Tue, 8 Aug 2023 11:57:46 -0300
Subject: [PATCH] Prevent a crash when proposal.width is 0 (#133)

---
 Sources/NavigationBarStyles/FixedSizeNavBarView.swift | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/Sources/NavigationBarStyles/FixedSizeNavBarView.swift b/Sources/NavigationBarStyles/FixedSizeNavBarView.swift
index 98f0ef3..2d8de96 100644
--- a/Sources/NavigationBarStyles/FixedSizeNavBarView.swift
+++ b/Sources/NavigationBarStyles/FixedSizeNavBarView.swift
@@ -86,7 +86,7 @@ struct FixedSizeNavBarViewLayout: Layout {
         cache: inout ()
     ) {
         // Tell each subview where to appear.
-        guard subviews.count > 1 else { return }
+        guard subviews.count > 1, let proposedWidth = proposal.width else { return }
 
         var tabsIndices = subviews.indices
         let indicatorIndex = tabsIndices.removeLast()
@@ -98,8 +98,8 @@ struct FixedSizeNavBarViewLayout: Layout {
         let totalSpacing = tabsViews.count > 1 ?  CGFloat(tabsViews.count - 1) * self.spacing : CGFloat.zero
         let maxHeight = tabsSize.map { $0.height }.reduce(CGFloat.zero) { max($0, $1) }
 
-        let sizeProposal = ProposedViewSize(width: (proposal.width! - totalSpacing) / CGFloat(tabsViews.count), height: maxHeight)
-        let fixedWidhtSubview = (proposal.width! - totalSpacing) / CGFloat(tabsViews.count)
+        let sizeProposal = ProposedViewSize(width: (proposedWidth - totalSpacing) / CGFloat(tabsViews.count), height: maxHeight)
+        let fixedWidhtSubview = (proposedWidth - totalSpacing) / CGFloat(tabsViews.count)
         var x = bounds.minX + fixedWidhtSubview / 2
 
         for index in tabsViews.indices {
@@ -120,8 +120,8 @@ struct FixedSizeNavBarViewLayout: Layout {
             return
         }
 
-        let indicatorWidth = proposal.width! / CGFloat(itemsCount)
-        let indicatorX =  bounds.minX + ((contentOffset * (proposal.width! / pagerWidth)) / CGFloat(itemsCount)) + (indicatorWidth / 2)
+        let indicatorWidth = proposedWidth / CGFloat(itemsCount)
+        let indicatorX =  bounds.minX + ((contentOffset * (proposedWidth / pagerWidth)) / CGFloat(itemsCount)) + (indicatorWidth / 2)
         indicatorSubview.place(at: CGPoint(x: indicatorX, y: bounds.maxY - (indicatorViewSize.height / 2)),
                                anchor: .center,
                                proposal: ProposedViewSize(width: indicatorWidth, height: indicatorViewSize.height))