一棚菊、 之前學(xué)習(xí)swift時(shí),使用characters進(jìn)行遍歷
let str = "Hello world!"
for s in str.characters {
print(s)
}
在swift3之后該方法被放棄，直接對(duì)String類型進(jìn)行遍歷
let str = "Hello world!"
for s in str {
print(s)
}
二、 獲得String的字符數(shù)量
let str = "Hello world!"
let count = str.characters.count
print(count)
改為
let str = "Hello world!"
let count = str.count
print(count)
