初探Swift3.0带来的变化汇总

这个周末抽空看了下swift3.0的变化，今天小编通过本教程给大家分享Swift3.0带来的变化，非常不错，感兴趣的朋友参考下吧

废话不多说了，直接给大家贴代码了。

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									var string = "Hello-Swift"

									//获取某个下标后一个下标对应的字符 char="e"

									//swift2.2

									//var char = string[startIndex.successor()]

									//swift3.0

									var char = string[string.index(after: startIndex)]

									//获取某个下标前一个下标对应的字符 char2 = "t"

									//swift2.2

									//var char2 = string[endIndex.predecessor()]

									//swift3.0

									var char2 = string[string.index(before: string.endIndex)]

									//通过范围获取字符串中的一个子串 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]

									//获取某个子串在父串中的范围

									//swift2.2

									//var range = string.rangeOfString("Hello")

									//swift3.0

									var range = string.range(of: "Hello")

									//追加字符串操作 此时string = "Hello-Swift! Hello-World"

									//swift2.2

									//string.appendContentsOf(" Hello-World")

									//swift3.0

									string.append(" Hello-World")

									//在指定位置插入一个字符 此时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))

									//在指定位置插入一组字符 此时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))

									//在指定范围替换一个字符串 此时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")

									//在指定位置删除一个字符 此时string = "Hi-Swift!~~~~ Hello-Worl"

									//swift2.2

									//string.removeAtIndex(string.endIndex.predecessor())

									//swift3.0

									string.remove(at: string.index(before:string.endIndex))

									//删除指定范围的字符 此时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"

									//全部转换为大写

									//swift2.2

									//string2 = string2.uppercaseString

									//swift3.0

									string2 = string2.uppercased()

									//全部转换为小写

									//swift2.2

									//string2 = string2.lowercaseString

									//swift3.0

									string2 = string2.lowercased()