Update 22_Protocols.md (#678)

语法不对,参考官方文档修改过来了
2017-01-03 18:29:54 +08:00
parent 33e4f02ee2
commit 59e630f19e
1 changed files with 10 additions and 10 deletions
--- a/source/chapter2/22_Protocols.md
+++ b/source/chapter2/22_Protocols.md
@ -208,17 +208,17 @@ protocol Togglable {

 ```swift
 enum OnOffSwitch: Togglable {
-	case Off, On
+    case off, on
    mutating func toggle() {
        switch self {
-		case Off:
-			self = On
-		case On:
-			self = Off
+        case .off:
+            self = .on
+        case .on:
+            self = .off
        }
    }
 }
-var lightSwitch = OnOffSwitch.Off
+var lightSwitch = OnOffSwitch.off
 lightSwitch.toggle()
 // lightSwitch 现在的值为 .On
 ```