[英]How to limit the number of results in a FetchRequest in SwiftUI
如何限制检索到的大小FetchedResults
制作时FetchRequest
到CoreData?
struct ContentView: View {
var fetchRequest:FetchRequest<Kana>
init(){
fetchRequest = FetchRequest<Kana>(entity: Kana.entity(), sortDescriptors: [], predicate: NSPredicate(format: "alphabet == %@", "hiragana"))
}
var body: some View {
List{
Text("10 Kanas")
// Display 10 Kanas
}
}
}
您需要创建FetchRequest
与NSFeatchRequest
使用相应的初始化器,如下图所示
init() {
let request: NSFetchRequest<Kana> = Kana.fetchRequest()
request.fetchLimit = 10
request.predicate = NSPredicate(format: "alphabet == %@", "hiragana")
fetchRequest = FetchRequest<Kana>(fetchRequest: request)
}
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