Swift 如何将NSSet的内容追加到[NSManagedObject]?
我的代码Swift 如何将NSSet的内容追加到[NSManagedObject]?,swift,core-data,entity-relationship,nsmanagedobject,nsset,Swift,Core Data,Entity Relationship,Nsmanagedobject,Nsset,我的代码 isFiltering = true let appDelegate = UIApplication.shared.delegate as! AppDelegate let context = appDelegate.persistentContainer.viewContext let words = textInSearchField.components(separatedBy: " ") for word in words{ if (word).co
isFiltering = true
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let context = appDelegate.persistentContainer.viewContext
let words = textInSearchField.components(separatedBy: " ")
for word in words{
if (word).count == 0{
continue
}
let firstNamePredicate = NSPredicate(format: "firstName contains[c] %@", word)
let lastNamePredicate = NSPredicate(format: "lastName contains[c] %@", word)
let idPredicate = NSPredicate(format: "id contains[c] %@", word)
let orPredicate = NSCompoundPredicate(type: NSCompoundPredicate.LogicalType.or, subpredicates: [firstNamePredicate, lastNamePredicate, idPredicate])
clientsEntity.predicate = orPredicate
clientResults = try! context.fetch(clientsEntity) as! [NSManagedObject]
let sort:NSSortDescriptor = NSSortDescriptor(key:"dateSorted", ascending: false)
for (index, ob) in clientResults.enumerated(){
let relationship = ob.value(forKey: "assessed_by") as! NSSet
let array = relationship.sortedArray(using: [sort]) as! [NSManagedObject]
for item in array.enumerated() {
results.append(item.element)
print(results)
}
}
我的数据模型:
我正在使用一个tableView来显示我的数据,这非常有效,现在我已经实现了一个过滤功能,允许用户使用NSCompoundPredicate根据客户的名字、姓氏、id等进行搜索
然后,我使用NSSortDescriptor按日期对生成的[NSManagedObject]进行排序,我的目标是设置clientResults变量以包含NSSet的排序内容。我的print语句只输出results变量中有一个评估,而实际上NSSet包含其中两个nsmanagedObject
let sort:NSSortDescriptor = NSSortDescriptor(key:"dateSorted", ascending: false)
for (index, ob) in clientResults.enumerated(){
let relationship = ob.value(forKey: "assessed_by") as! NSSet
let array = relationship.sortedArray(using: [sort]) as! [NSManagedObject]
// MARK - I enumerate the contents of the sorted array.
for item in array.enumerated() {
results.append(item.element)
print(results)
}
}
将NSSet的内容分配给[NSManagedObject]类型的变量的最佳做法是什么
谢谢。如果您知道
NSSet
中的元素属于NSManagedObject
类型,为什么不这样做呢
let managedObjectsArray = set.allObjects
或者,如果要确保其类型正确,可以执行以下操作:
if let managedObjectsArray = set.allObjects as? [NSManagedObject] {
//do what you want with [NSManagedObject] array
}