January 2020
Intermediate to advanced
356 pages
6h 4m
Chinese
Content preview from Swift游戏开发经典实例
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156
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第
5
章
当文件位于
iCloud
中，同时我们又修改了这个文件，
iCloud
会自动将修改的内容
上传到
iCloud
，这样其他设备就会收到新版本的文件。如果一个文件同时在不同的
设备上被修改，文件将发生冲突。在查找结果中通过
NSMetadataUbiquitousItem
HasUnresolvedConflictsKey
键检索相关属性，我们可以知道是否有冲突发生：值为
true
，表明有冲突。
解决冲突有多种的方法，其中比较简单的做法是“当冲突方式时，标记本地文件版
本为正确的版本”。例如以下代码：
func resolveConflictsForItemAtURL(url : URL) {
//
“只有我是正确的，其他都是错的”
for conflictVersion in NSFileVersion
.unresolvedConflictVersionsOfItem(at: url)! {
//
标记其他版本为“已解决”，
iCloud
会通知其他设备去
//
更新它们的本地拷贝
conflictVersion.isResolved = true
}
//
移除发生冲突的拷贝
do {
try NSFileVersion.removeOtherVersionsOfItem(at: url)
} catch let error {
print("Failed to remove other versions of item at \(url): \(error)") ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.