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Change force unwraps so that we just fail on the move instead of crashing

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This commit is contained in:
Maurice Parker 2021-04-13 07:38:41 -05:00
parent c47480614c
commit 0ac3ba0bbb
1 changed files with 13 additions and 7 deletions
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12
iOS/MasterFeed/MasterFeedViewController.swift
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@ -370,22 +370,28 @@ class MasterFeedViewController: UITableViewController, UndoableCommandRunner {
return IndexPath(row: 0, section: destIndexPath.section)
} else {
let identifier = makeIdentifier(sortedNodes[index])
let candidateIndexPath = dataSource.indexPath(for: identifier)!
if let candidateIndexPath = dataSource.indexPath(for: identifier) {
let movementAdjustment = sourceIndexPath < destIndexPath ? 1 : 0
return IndexPath(row: candidateIndexPath.row - movementAdjustment, section: candidateIndexPath.section)
} else {
return sourceIndexPath
}
}
} else {
if index >= sortedNodes.count {
let identifier = makeIdentifier(sortedNodes[sortedNodes.count - 1])
let lastSortedIndexPath = dataSource.indexPath(for: identifier)!
if let lastSortedIndexPath = dataSource.indexPath(for: identifier) {
let movementAdjustment = sourceIndexPath > destIndexPath ? 1 : 0
return IndexPath(row: lastSortedIndexPath.row + movementAdjustment, section: lastSortedIndexPath.section)
} else {
return sourceIndexPath
}
} else {
let movementAdjustment = sourceIndexPath < destIndexPath ? 1 : 0
let identifer = makeIdentifier(sortedNodes[index - movementAdjustment])
return dataSource.indexPath(for: identifer)!
return dataSource.indexPath(for: identifer) ?? sourceIndexPath
}
}