ios 如何创建一组自定义对象 (Swift)？
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How do I create a Set of custom objects (Swift)?
提问by egor.zhdan
For my iOS app I have a model something like
对于我的 iOS 应用程序，我有一个类似的模型
class Person {
var Id: Int
var Name: String
init(id: Int, name: String?) {
self.Id = id
self.Name = name ?? ""
}
}
Then later on in my ViewControllerwhen I load data from the server I add some people to an array
然后ViewController当我从服务器加载数据时，我将一些人添加到数组中
class ViewController: UIViewController {
var people:[Person] = []
override func viewDidLoad() {
self.loadPeople()
}
func loadPeople() {
// This data will be coming from a server request
// so is just sample. It could have users which
// already exist in the people array
self.people.append(Person(id: "1", name: "Josh"))
self.people.append(Person(id: "2", name: "Ben"))
self.people.append(Person(id: "3", name: "Adam"))
}
}
What I am now trying todo is turn the peoplearray into a Set<Person>so it will not add duplicates. Is this possible to do or do I need to change my logic?
我现在要做的是将people数组转换为 aSet<Person>以便它不会添加重复项。这是可能的还是我需要改变我的逻辑？
回答by egor.zhdan
To make set of Personyou need to make it conform to Equatable and Hashable protocols:
要进行设置，Person您需要使其符合 Equatable 和 Hashable 协议：
class Person: Equatable, Hashable {
var Id: Int
var Name: String
init(id: Int, name: String?) {
self.Id = id
self.Name = name ?? ""
}
var hashValue: Int {
get {
return Id.hashValue << 15 + Name.hashValue
}
}
}
func ==(lhs: Person, rhs: Person) -> Bool {
return lhs.Id == rhs.Id && lhs.Name == rhs.Name
}
Then you can use set of persons like this:
然后你可以使用这样的一组人：
var set = Set<Person>()
set.insert(Person(id: 1, name: "name"))
回答by Tom Tallak Solbu
With Swift 2.0, Hashable and Equitable is a part of NSObject. All you need to do is to override "isEqual" and "var hash:" for the property of interest. In this case: "Id", Set will exclude Person-objects with identical Ids.
在 Swift 2.0 中，Hashable 和 Equitable 是 NSObject 的一部分。您需要做的就是覆盖感兴趣的属性的“isEqual”和“var hash:”。在这种情况下：“Id”，Set 将排除具有相同 Id 的 Person-objects。
class Person: NSObject {
var Id: Int
var Name: String
init(id: Int, name: String?) {
self.Id = id
self.Name = name ?? ""
}
override var hash: Int {
return Id.hashValue
}
override func isEqual(object: AnyObject?) -> Bool {
guard let rhs = object as? Person else {
return false
}
let lhs = self
return lhs.Id == rhs.Id
}
}
func mergeArrays(){
let person1 = Person(id: 1, name: "Tom")
let person2 = Person (id: 2, name: "John")
let person3 = Person(id: 3, name: "Adam")
let downloadedPeople = [person1,person2] //[{NSObject, Id 1, Name "Tom"}, {NSObject, Id 2, Name "John"}]
let peopleStoredLocally = [person1,person3] //[{NSObject, Id 1, Name "Tom"}, {NSObject, Id 3, Name "Adam"}]
let downloadedPeopleSet = Set(downloadedPeople) //{{NSObject, Id 2, Name "John"}, {NSObject, Id 1, Name "Tom"}}
let mergedSet = downloadedPeopleSet.union(peopleStoredLocally) //{{NSObject, Id 2, Name "John"}, {NSObject, Id 3, Name "Adam"}, {NSObject, Id 1, Name "Tom"}}
let mergedArray = Array(mergedSet)//[{NSObject, Id 2, Name "John"}, {NSObject, Id 3, Name "Adam"}, {NSObject, Id 1, Name "Tom"}]
}
