Swift开发教程--字符串的操作

替换

把?替换为/

var url = "http://blog.youkuaiyun.com/hello_hwc?viewmode=list"
var filtered = url.stringByReplacingOccurrencesOfString("?", withString: "/", options: NSStringCompareOptions.LiteralSearch, range: nil)

结果

"http://blog.youkuaiyun.com/hello_hwc/viewmode=list"

过滤
过滤掉单个字符/
var url = "http://blog.youkuaiyun.com/hello_hwc?viewmode=list"
var filtered = url.stringByReplacingOccurrencesOfString("/", withString: "", options: NSStringCompareOptions.LiteralSearch, range: nil)
结果
"http:blog.youkuaiyun.comhello_hwc?viewmode=list"
过滤掉开头和结尾的空白
var url = "   http://blog.youkuaiyun.com/hello_hwc?viewmode=list   "
var newString = url.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceCharacterSet())
结果
"http://blog.youkuaiyun.com/hello_hwc?viewmode=list"
切割
对字符串使用/作为分隔符来切割，不允许空字符串 
使用split函数
var url = "http://blog.youkuaiyun.com/hello_hwc?viewmode=list"
let splitedarray = split(url){$0 == "/"}
结果是一个数组
"http:"
"blog.youkuaiyun.com"
"hello_hwc?viewmode=list"

拼接
let splitedarray = ["1","2","3"]
let result = join("/", splitedarray)
结果
"1/2/3"