如何在Swift3 iOS中从对象数组中查找唯一值

class Person {
    let name: String
    let age: Int
    
    init(name: String, age: Int) {
        self.name = name
        self.age = age
    }
}

let people = [
    Person(name: "Alice", age: 30),
    Person(name: "Bob", age: 25),
    Person(name: "Alice", age: 22)
]

// 查找名为"Alice"的唯一Person对象
if let uniqueAlice = people.first(where: { $0.name == "Alice" }) {
    print("找到唯一的Alice: \(uniqueAlice.name), \(uniqueAlice.age)")
} else {
    print("没有找到名为Alice的人")
}

let aliceFilter = people.filter { $0.name == "Alice" }
if aliceFilter.count == 1 {
    let uniqueAlice = aliceFilter.first!
    print("找到唯一的Alice: \(uniqueAlice.name), \(uniqueAlice.age)")
} else {
    print("Alice不是唯一的或不存在")
}

var peopleByName = [String: Person]()
for person in people {
    peopleByName[person.name] = person
}

if let uniqueAlice = peopleByName["Alice"] {
    print("找到唯一的Alice: \(uniqueAlice.name), \(uniqueAlice.age)")
} else {
    print("没有找到名为Alice的人")
}