浅谈SwiftUI 里面$0是什么意思如何用

import UIKitlet name = [1,2,3,9,8,6]let reverseName = name.sorted(by:{$0>$1})let reverseName2 = name.sorted(by:{$1>$0})print(name)print(reverseName)print(reverseName2)

let numbers = [1,2,5,4,3,6,8,7]    sortNumbers = numbers.sorted(by: { (a, b) -> Bool in      return a < b    })    print("numbers -" + "/(sortNumbers)")

let numbers = [1,2,5,4,3,6,8,7] var sortNumbers = numbers.sorted(by: {$0 < $1}) print("numbers -" + "/(sortNumbers)")