swift常用字符串处理

import UIKit

var str = "Hello"

var newString = str + "Lucy"

var newTypestring = Nsstring(string: newString)

newTypestring.substringFromIndex(5)

newTypestring.substringToIndex(5)

newTypestring.substringWithRange(NSRange(location: 3,length: 5))

if newTypestring.containsstring("Lucy"){
  print("Hi")
}

newTypestring.componentsSeparatedByString("o")

newTypestring.uppercaseString

newTypestring.lowercaseString