默认情况下，不允许使用constraint，取消后，需要代码处理，不然会出现数据重复；经过一番折腾，找到了个简单办法，本地Entity可以继续使用constraint， 与大家分享。
第一步：新建Model Configuration选中Model文件， 通过Editor -> Add Configuration菜单，新建Local和Cloud两个Configuration，把需要同步的Entity拖入Cloud，本地使用的Entity拖到Local;
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对Cloud Configuration，选中Used with CloudKit选荐
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第二步：修改Persistence中的container配置
var container: NSPersistentCloudKitContainer = {
let container = NSPersistentCloudKitContainer(name: "AAStock") // 1. 注意：与实际保持一致
let storeDirectory = FileManager.default.urls(for: .applicationSupportDirectory, in: .userDomainMask).first! // 2. 获取文件位置
// Create a store description for a local store
let localStoreLocation = storeDirectory.appendingPathComponent("local.sqlite") // 3. 为Local配置添加Store
let localStoreDescription =
NSPersistentStoreDescription(url: localStoreLocation)
localStoreDescription.configuration = "Local"
// Create a store description for a CloudKit-backed local store
let cloudStoreLocation = storeDirectory.appendingPathComponent("cloud.sqlite") // 4. 为Cloud配置添加Store
let cloudStoreDescription =
NSPersistentStoreDescription(url: cloudStoreLocation)
cloudStoreDescription.configuration = "Cloud"
// Set the container options on the cloud store
cloudStoreDescription.cloudKitContainerOptions =
NSPersistentCloudKitContainerOptions(
containerIdentifier: "iCloud.com.tang.AAStock") // 5. 注意保持CloudKit container一致
// Update the container's list of store descriptions
container.persistentStoreDescriptions = [
cloudStoreDescription,
localStoreDescription
]
// Load both stores
container.loadPersistentStores { storeDescription, error in
guard error == nil else {
fatalError("Could not load persistent stores. \(error!)")
}
}
return container
}()
通过上述两步配置，可以愉快地使用constraint了，试试吧。
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