在Swift中连接字符串和整数

Question

我希望不同类型之间的连接在Swift中是直截了当的,但显然不是.这是什么解决方法？

var boy = "Bart Simpson"
var age = 7
print(boy + " is " + age)

Answer 1

非常容易,包裹所有可打印的对象 \( )

let boy = "Bart Simpson"
let age = 7
println("\(boy) is \(age)")

Answer 2

let boy = "Bart Simpson"
let age = 7

let sentence = String(format:"%@ is %d", boy, age)
println(sentence) // "Bart Simpson is 7"