iOS分享世界MG的Swift空间

6-Swift字符串

2016-04-17  本文已影响0人  Mg明明就是你

字符串的介绍

字符串的使用

// 字符串遍历
var str = "Hello, Swift"
for c in str.characters {
    print(c)
}```

- 字符串拼接

两个字符串的拼接
let str1 = "Hello"
let str2 = "World"
let str3 = str1 + str2```

let name = "why"
let age = 18
let info = "my name is \(name), age is \(age)"
比如时间:03:04
let min = 3
let second = 4
let time = String(format: "%02d:%02d", arguments: [min, second])
let myStr = "www.520it.com"
var subStr = (myStr as NSString).substringFromIndex(4)
subStr = (myStr as NSString).substringToIndex(3)
subStr = (myStr as NSString).substringWithRange(NSRange(location: 4, length: 5))
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