Tag: 强制解包

Swift语言中的感叹号是什么意思？

Swift编程语言指南有以下例子： class Person { let name: String init(name: String) { self.name = name } var apartment: Apartment? deinit { println("\(name) is being deinitialized") } } class Apartment { let number: Int init(number: Int) { self.number = number } var tenant: Person? deinit { println("Apartment #\(number) is being deinitialized") } } var john: Person? var number73: […]