在Swift上使用CoreData进行带Fetch请求的查询

import CoreData

// 获取NSManagedObjectContext对象
guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else {
    return
}
let managedContext = appDelegate.persistentContainer.viewContext

let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "EntityName")

// 设置排序方式（可选）
let sortDescriptor = NSSortDescriptor(key: "propertyName", ascending: true)
fetchRequest.sortDescriptors = [sortDescriptor]

let predicate = NSPredicate(format: "propertyName == %@", argumentArray: ["value"])
fetchRequest.predicate = predicate

do {
    let result = try managedContext.fetch(fetchRequest)
    for data in result as! [NSManagedObject] {
        // 处理查询结果
        let propertyValue = data.value(forKey: "propertyName")
        // ...
    }
} catch {
    print("查询失败：\(error)")
}