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border condition of delete message

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This commit is contained in:
nixzhu
2015-07-08 12:26:30 +08:00
parent 3dc4a0f17f
commit d76c80a631
1 changed files with 17 additions and 4 deletions
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Yep/ViewControllers/Conversation/ConversationViewController.swift
+17 -4
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@@ -2102,7 +2102,11 @@ extension ConversationViewController: UICollectionViewDataSource, UICollectionVi
var sectionDateMessage: Message?
if let currentMessageIndex = strongSelf.messages.indexOf(message) {
if let previousMessage = strongSelf.messages[safe: currentMessageIndex - 1] {
let previousMessageIndex = currentMessageIndex - 1
if let previousMessage = strongSelf.messages[safe: previousMessageIndex] {
if previousMessage.mediaType == MessageMediaType.SectionDate.rawValue {
sectionDateMessage = previousMessage
}
@@ -2110,15 +2114,24 @@ extension ConversationViewController: UICollectionViewDataSource, UICollectionVi
}
if let sectionDateMessage = sectionDateMessage {
strongSelf.displayedMessagesRange.length -= 2
var canDeleteTwoMessages = false // 考虑刚好的边界情况，例如消息为本束的最后一条，而 sectionDate 在上一束中
if strongSelf.displayedMessagesRange.length >= 2 {
strongSelf.displayedMessagesRange.length -= 2
canDeleteTwoMessages = true
}
realm.write {
realm.delete(sectionDateMessage)
realm.delete(message)
}
let previousIndexPath = NSIndexPath(forItem: indexPath.item - 1, inSection: indexPath.section)
strongSelf.conversationCollectionView.deleteItemsAtIndexPaths([previousIndexPath, indexPath])
if canDeleteTwoMessages {
let previousIndexPath = NSIndexPath(forItem: indexPath.item - 1, inSection: indexPath.section)
strongSelf.conversationCollectionView.deleteItemsAtIndexPaths([previousIndexPath, indexPath])
} else {
strongSelf.conversationCollectionView.deleteItemsAtIndexPaths([indexPath])
}
} else {
strongSelf.displayedMessagesRange.length -= 1