//换行

var str = "你好，playground"

var stra = "你sss好，playground"

var see = "\(str)\n\(stra)"

print(see)

//查找一个字符串在一个字符串中的位置范围

var stringTest = "andy Wangpeng"

stringTest.rangeOfString("Wangpeng")

stringTest.rangeOfString("Wangpeng",options: NSStringCompareOptions.CaseInsensitiveSearch)

stringTest.startIndex

stringTest.endIndex

//查找一个字符串在一个指定区域的位置范围（不常用）

let startIndex:String.Index = stringTest.startIndex.advancedBy(3);

let endIndex:String.Index = stringTest.endIndex.advancedBy(-3)

let strRange = startIndex..<endIndex

stringTest.rangeOfString("Wangpeng",options: NSStringCompareOptions.CaseInsensitiveSearch,range: strRange)

//截取字符串

stringTest.substringWithRange(strRange)

//插入字符串

stringTest.insert("!", atIndex: startIndex)

//删除指定字符串

stringTest.removeAtIndex(startIndex)

stringTest

//替换字符串

stringTest.stringByReplacingCharactersInRange(strRange, withString: "Hello")

//字符串可以用format了

var aa = NSString(format: "sssss%d",22) as String

let login = (true,"慕课女神")

let(islog,_) = login

//元组

var ConnectState = (ResponseCode:404,_:"success",text:"connect to imooc");

ConnectState.0

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