andre/the-swift-programming-language-in-chinese
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Update 03_Strings_and_Characters.md

Browse Source
This commit is contained in:
even
2015-08-06 15:19:09 +08:00
parent b119312972
commit cc69eb779a
1 changed files with 2 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
source/chapter2/03_Strings_and_Characters.md
View File

@ -229,7 +229,7 @@ let wiseWords = "\"Imagination is more important than knowledge\" - Einstein"
// "Imageination is more important than knowledge" - Enistein
let dollarSign = "\u{24}" // $, Unicode 标量 U+0024
let blackHeart = "\u{2665}" // ♥, Unicode 标量 U+2665
let sparklingHeart = "\u{1F496}" // 💖, Unicode 标量 U+1F496
let sparklingHeart = "\u{1F496}" // 💖, Unicode 标量 U+1F496
```
<a name="extended_grapheme_clusters"></a>
@ -316,7 +316,7 @@ println("the number of characters in \(word) is \(count(word))")
前面提到，不同的字符可能会占用不同的内存空间数量，所以要知道字符的确定位置，就必须从字符串开头遍历每一个 Unicode 标量到字符串结尾。因此，Swift 的字符串不能用整数(integer)做索引。
使用`startIndex`属性可以获取字符串的第一个字符。使用`endIndex`属性可以获取最后一个字符的位置。如果字符串是空值，`startIndex`和`endIndex`是相等的。
使用`startIndex`属性可以获取字符串的第一个字符。使用`endIndex`属性可以获取最后的位置（译者注：其实endIndex在值上与字符串的长度相等）。如果字符串是空值，`startIndex`和`endIndex`是相等的。
```swift
let greeting = "Guten Tag"