在swift2.0的时候,可以通过调用全局countElements
函数,并将字符串作为参数进行传递,可以获取该字符串的字符数量。如下:
let unusualMenagerie = "Koala, Snail, Penguin, Dromedary"
print("unusualMenagerie has \(countElements(unusualMenagerie)) characters")
// 打印输出:"unusualMenagerie has 40 characters"
但是在swift3.0中,countElements被characters.count替代,如下:
let unusualMenagerie = "Koala, Snail, Penguin, Dromedary"
print("unusualMenagerie has \(unusualMenagerie.characters) characters")
// 打印输出:"unusualMenagerie has 40 characters"