Swift 循环

While & repeat

repeat 和 while的区别是 repeat无论如何都会至少执行一次.    while BooleanValue{    }    repeat{    }while BooleanValue

For

    for var i=  1,i <= 10;i++{}    let names = ["Oscar","Sally","Marty"]    for person in names{}

退出循环

使用break来强制退出循环