初探Swift3.0帶來的變化匯總。本站提示廣大學習愛好者：（初探Swift3.0帶來的變化匯總）文章只能為提供參考，不一定能成為您想要的結果。以下是初探Swift3.0帶來的變化匯總正文
廢話不多說了，直接給大家貼代碼了。
var string = "Hello-Swift"
//獲取某個下標後一個下標對應的字符 char="e"
//swift2.2
//var char = string[startIndex.successor()]
//swift3.0
var char = string[string.index(after: startIndex)]
//獲取某個下標前一個下標對應的字符 char2 = "t"
//swift2.2
//var char2 = string[endIndex.predecessor()]
//swift3.0
var char2 = string[string.index(before: string.endIndex)]
//經過范圍獲取字符串中的一個子串 Hello
//swift2.2
//var subString = string[startIndex...startIndex.advancedBy(4)]
//swift3.0
var subString = string[startIndex...string.index(startIndex, offsetBy: 4)]
//swift2.2
//var subString2 = string[endIndex.advancedBy(-5)...endIndex.predecessor()]
//swift3.0
var subString2 = string[string.index(endIndex, offsetBy: -5)..<endIndex]
//獲取某個子串在父串中的范圍
//swift2.2
//var range = string.rangeOfString("Hello")
//swift3.0
var range = string.range(of: "Hello")
//追加字符串操作 此時string = "Hello-Swift! Hello-World"
//swift2.2
//string.appendContentsOf(" Hello-World")
//swift3.0
string.append(" Hello-World")
//在指定地位拔出一個字符 此時string = "Hello-Swift!~ Hello-World"
//swift2.2
//string.insert("~", atIndex: string.startIndex.advancedBy(12))
//swift3.0
string.insert("~", at: string.index(string.startIndex, offsetBy: 12))
//在指定地位拔出一組字符 此時string = "Hello-Swift!~~~~ Hello-World"
//swift2.2
//string.insertContentsOf(["~","~","~"], at: string.startIndex.advancedBy(12))
//swift3.0
string.insert(contentsOf: ["~","~","~"], at: string.index(string.startIndex, offsetBy: 12))
//在指定范圍交換一個字符串 此時string = "Hi-Swift!~~~~ Hello-World"
//swift2.2
//string.replaceRange(string.startIndex...string.startIndex.advancedBy(4), with: "Hi")
//swift3.0
string.replaceSubrange(string.startIndex...string.index(string.startIndex, offsetBy: 4), with: "Hi")
//在指定地位刪除一個字符 此時string = "Hi-Swift!~~~~ Hello-Worl"
//swift2.2
//string.removeAtIndex(string.endIndex.predecessor())
//swift3.0
string.remove(at: string.index(before:string.endIndex))
//刪除指定范圍的字符 此時string = "Swift!~~~~ Hello-Worl"
//swift2.2
//string.removeRange(string.startIndex...string.startIndex.advancedBy(2))
//swift3.0
string.removeSubrange(string.startIndex...string.index(string.startIndex, offsetBy: 2))
var string2 = "My name is Jaki"
//全部轉換為大寫
//swift2.2
//string2 = string2.uppercaseString
//swift3.0
string2 = string2.uppercased()
//全部轉換為小寫
//swift2.2
//string2 = string2.lowercaseString
//swift3.0
string2 = string2.lowercased()
需求留意，在Swift3.0中Range構造體被劃分紅了兩品種型，Range和ClosedRange，辨別用來描繪左閉右開區間和閉區間，對應到運算符為0..<10和0...10。
從下面的示例代碼中可以看出，String類型中的很多辦法命名停止了Swift作風的簡化，改動較大的一個點是關於下標index的改動，移除了兩個Index下標挪動的辦法，運用String類型的index()辦法來停止下標的挪動操作，編程愈加平安。
以上所述是給大家引見的初探Swift3.0帶來的變化匯總，希望對大家有所協助，假如大家有任何疑問請給我留言，會及時回復大家的。在此也十分感激大家對網站的支持！
