为什么用OBJ-C风格的NSSortDescriptor
打扰,在急速的,我们可以很好地使用排序斯威夫特高阶函数 - Xcode的8.x的迅速3.X
class Person: NSObject {
let firstName: String
let lastName: String
let age: Int
init(firstName: String, lastName: String, age: Int) {
self.firstName = firstName
self.lastName = lastName
self.age = age
}
override var description: String {
return "\(firstName) \(lastName)"
}
}
let a = Person(firstName: "a", lastName: "b", age: 24)
let b = Person(firstName: "c", lastName: "d", age: 27)
let c = Person(firstName: "e", lastName: "f", age: 33)
let d = Person(firstName: "g", lastName: "h", age: 31)
let peopleObject = [d, b, a, c]
//SWIFTY
let sortedByFirstNameSwifty = peopleObject.sorted(by: { $0.firstName < $1.firstName })
print(sortedByFirstNameSwifty)//prints[a b, c d, e f, g h]
//Objective c way
let firstNameSortDescriptor = NSSortDescriptor(key: "firstName", ascending: true, selector: #selector(NSString.localizedStandardCompare(_:)))
let sortedByFirstName = (peopleObject as NSArray).sortedArray(using: [firstNameSortDescriptor])
print(sortedByFirstName)//prints [a b, c d, e f, g h]
正是我需要的。谢谢! –
新格式似乎是.. NSSortDescriptor(关键: “ID”,上升:真,选择:#selector(NSString.localizedCompare(_ :))) –
@JosephAstrahan:谢谢,更新! –